MCUXpresso Platform Customization
From Variscite Wiki
DART-MX8M
Sections
Available dtbs
To allow Cortex M4 accessing shared resources without experiencing Linux kernel conflicts, a dedicated device tree must be loaded, by selecting the right version with the symbolic link in the /boot folder of the booting media.
These device trees contain m4 label in their name.
| File Name |
Description |
|---|---|
| Image.gz-fsl-imx8mq-var-dart-m4-emmc-wifi-hdmi.dtb | Device tree blob for eMMC, WIFI and HDMI display configuration. SD card disabled. |
| Image.gz-fsl-imx8mq-var-dart-m4-emmc-wifi-lvds.dtb | Device tree blob for eMMC, WIFI and LVDS display configuration. SD card disabled. |
| Image.gz-fsl-imx8mq-var-dart-m4-emmc-wifi-dual-display.dtb | Device tree blob for eMMC, WIFI and dual LVDS+HDMI display configuration. SD card disabled. |
| Image.gz-fsl-imx8mq-var-dart-m4-sd-emmc-hdmi.dtb | Device tree blob for SD, eMMC and HDMI display configuration. WIFI disabled. |
| Image.gz-fsl-imx8mq-var-dart-m4-sd-emmc-lvds.dtb | Device tree blob for SD, eMMC and LCDIF LVDS display configuration. WIFI disabled. |
| Image.gz-fsl-imx8mq-var-dart-m4-sd-emmc-dual-display.dtb | Device tree blob for SD, eMMC and dual LVDS+HDMI display configuration. WIFI disabled. |
Default M4 pins
Default M4 pins used by the demos are:
| function | pin |
|---|---|
| debug UART (UART2) | RX: J12.6 / TX: J12.4 |
| GPIO (GPIO4_IO03) | LED7 |
| I2C (I2C3) | SCL: J12.18 / SDA: J12.20 |
| PWM (PWM2) | J14.3 |
Available Demos
- driver_examples/i2c/interrupt_b2b_transfer/slave
- driver_examples/i2c/interrupt_b2b_transfer/master
- driver_examples/i2c/polling_b2b_transfer/slave
- driver_examples/i2c/polling_b2b_transfer/master
- driver_examples/wdog
- driver_examples/gpio/led_output
- driver_examples/tmu/tmu_monitor_report
- driver_examples/pwm
- driver_examples/uart/auto_baudrate_detect
- driver_examples/uart/interrupt
- driver_examples/uart/interrupt_rb_transfer
- driver_examples/uart/polling
- driver_examples/uart/interrupt_transfer
- driver_examples/gpt/timer
- driver_examples/gpt/capture
- driver_examples/ecspi/ecspi_loopback
- driver_examples/qspi/polling_transfer
- driver_examples/rdc
- driver_examples/sema4/uboot
- rtos_examples/freertos_ecspi/ecspi_loopback
- rtos_examples/freertos_hello
- rtos_examples/freertos_queue
- rtos_examples/freertos_sem
- rtos_examples/freertos_generic
- rtos_examples/freertos_uart
- rtos_examples/freertos_tickless
- rtos_examples/freertos_mutex
- rtos_examples/freertos_event
- rtos_examples/freertos_swtimer
- rtos_examples/freertos_i2c
- cmsis_driver_examples/i2c/int_b2b_transfer/slave
- cmsis_driver_examples/i2c/int_b2b_transfer/master
- cmsis_driver_examples/uart/interrupt_transfer
- cmsis_driver_examples/ecspi/int_loopback_transfer
- multicore_examples/rpmsg_lite_str_echo_rtos
- multicore_examples/rpmsg_lite_pingpong_rtos/linux_remote
- demo_apps/hello_world
NXP Memory types
The SDK allow linking using 2 different memory types: DDR, TCM.
Here is available a short summary of memory areas used by Cortex-M4 as described in related linker file.
| memory type | M4 memory area | A53 memory area | memory lentgh | linker file |
|---|---|---|---|---|
| DDR | 0x80000000-0x801FFFFF (code) 0x80200000-0x803FFFFF (data) 0x80400000-0x80FFFFFF (data2) |
0x80000000-0x801FFFFF (code) 0x80200000-0x803FFFFF (data) 0x80400000-0x80FFFFFF (data2) |
16MB (DDR) | MIMX8MQ6xxxJZ_cm4_ddr_ram.ld |
| TCM | 0x1FFE0000-0x1FFFFFFF (code) 0x20000000-0x2001FFFF (data) 0x80000000-0x80FFFFFF (data2) |
0x007E0000-0x007FFFFF (code) 0x00800000-0x0081FFFF (data) 0x80000000-0x80FFFFFF (data2) |
256kB (TCM) + 16MB (DDR) | MIMX8MQ6xxxJZ_cm4_ram.ld |
All linker files are locate in the armgcc folder of each demo.
The DDR reserved area must much the one declared in the kernel device tree: at least 2 GB of RAM is required on the SoM to allow Cortex-M4 accessing the range 0x80000000 - 0x80FFFFFF.
The RPMSG area is located at 0xB8000000: at least 3 GB of RAM is required on the SoM to allow Cortex-M4 accessing the RPMSG area. After launching the build_all.sh command the following folder will be created in the armgcc folder
- ddr_debug: containing DDR binaries compiled in debug mode (not stripped: symbols available)
- ddr_release: containing DDR binaries compiled in release mode (stripped: no symbols available)
- debug: containing TCM binaries compiled in debug mode (not stripped: symbols available)
- release: containing TCM binaries compiled in release mode (stripped: no symbols available)
Further details about memory mapping are available in i.MX 8M Applications Processors Reference Manual paragraphs:
- 2.1.2 Cortex-A53 Memory Map
- 2.1.3 Cortex-M4 Memory Map
Variscite Memory types
The SDK allow linking using 2 different memory types: DDR, TCM.
Here is available a short summary of memory areas used by Cortex-M4 as described in related linker file.
| memory type | M4 memory area | A53 memory area | memory lentgh | linker file |
|---|---|---|---|---|
| DDR | 0x7E000000-0x7E1FFFFF (code) 0x7E200000-0x7E3FFFFF (data) 0x7E400000-0x7EFFFFFF (data2) |
0x7E000000-0x7E1FFFFF (code) 0x7E200000-0x7E3FFFFF (data) 0x7E400000-0x7EFFFFFF (data2) |
16MB (DDR) | MIMX8MQ6xxxJZ_cm4_ddr_ram.ld |
| TCM | 0x1FFE0000-0x1FFFFFFF (code) 0x20000000-0x2001FFFF (data) 0x7E000000-0x7EFFFFFF (data2) |
0x007E0000-0x007FFFFF (code) 0x00800000-0x0081FFFF (data) 0x7E000000-0x7EFFFFFF (data2) |
256kB (TCM) + 16MB (DDR) | MIMX8MQ6xxxJZ_cm4_ram.ld |
All linker files are locate in the armgcc folder of each demo.
The DDR reserved area must much the one declared in the kernel device tree: at least 1 GB of RAM is required on the SoM to allow Cortex-M4 accessing the range 0x7E000000 - 0x7EFFFFFF. For some reason, Cortex-M4 is not able to access RAM locations below 0x60000000: SoMs with 512 MB of RAM are not suitable to use Cortex-M4.
The RPMSG area is located at 0x40000000: all SoMs allow Cortex-M4 accessing the RPMSG area.
After launching the build_all.sh command the following folder will be created in the armgcc folder
- ddr_debug: containing DDR binaries compiled in debug mode (not stripped: symbols available)
- ddr_release: containing DDR binaries compiled in release mode (stripped: no symbols available)
- debug: containing TCM binaries compiled in debug mode (not stripped: symbols available)
- release: containing TCM binaries compiled in release mode (stripped: no symbols available)
Further details about memory mapping are available in i.MX 8M Applications Processors Reference Manual paragraphs:
- 2.1.2 Cortex-A53 Memory Map
- 2.1.3 Cortex-M4 Memory Map
JTAG
The VAR-DT8MCustomBoard exports the DART-MX8M JTAG signals through J29, a standard 1.27" 10 pin header.
Here the pinout
| pin | signal | description | pin | signal | description |
|---|---|---|---|---|---|
| 1 | JTAG_VREF | JTAG IO reference voltage, connects to SOM_NVCC_3V3. |
2 | JTAG_TMS | JTAG Mode Select signal |
| 3 | GND | Digital Ground | 4 | JTAG_TCK | JTAG Clock signal, requires 10K pull down. |
| 5 | GND | Digital Ground | 6 | JTAG_TDO | JTAG Data Out signal |
| 7 | GND | Digital Ground | 8 | JTAG_TDI | JTAG Data In signal |
| 9 | JTAG_NTRST_C | JTAG Reset signal | 10 | NRST_CON | Programmer Reset, used to put the SOC in reset state. |
Please refer to board schematics for further details.
Releases
mcuxpresso-2.5.1-mx8mq-v1.0
- HARDWARE_NAME = DART-MX8M
- RELEASE_NAME = mcuxpresso-2.5.1-mx8mq-v1.0
- RELEASE_LINK = MCUXPRESSO_2.5.1_V1.0_DART-MX8M
- MCUXPRESSO_VERSION = 2.5.1
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.5.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/dart_mx8mq
- DOCS_FOLDER = docs
- PINS_SECTION = DART-MX8M_PINS_SECTION
- DEMOS_SECTION = DART-MX8M_DEMOS_SECTION
- DTBS_SECTION = DART-MX8M_DTBS_SECTION
- MEMORY_TYPES_SECTION = DART-MX8M_MEMORY-TYPES_NXP_SECTION
- JTAG_SECTION = DART-MX8M_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK i.MX 8M Devices.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MQ
mcuxpresso-2.8.0-mx8mq-v1.0
- HARDWARE_NAME = DART-MX8M
- RELEASE_NAME = mcuxpresso-2.8.0-mx8mq-v1.0
- RELEASE_LINK = MCUXPRESSO_2.8.0_V1.0_DART-MX8M
- MCUXPRESSO_VERSION = 2.8.0
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.8.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/dart_mx8mq
- DOCS_FOLDER = docs
- PINS_SECTION = DART-MX8M_PINS_SECTION
- DEMOS_SECTION = DART-MX8M_DEMOS_SECTION
- DTBS_SECTION = DART-MX8M_DTBS_SECTION
- MEMORY_TYPES_SECTION = DART-MX8M_MEMORY-TYPES_NXP_SECTION
- JTAG_SECTION = DART-MX8M_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK i.MX 8M Devices.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MQ
mcuxpresso-2.5.1-mx8mq-v1.1
- HARDWARE_NAME = DART-MX8M
- RELEASE_NAME = mcuxpresso-2.5.1-mx8mq-v1.1
- RELEASE_LINK = MCUXPRESSO_2.5.1_V1.1_DART-MX8M
- MCUXPRESSO_VERSION = 2.5.1
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.5.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/dart_mx8mq
- DOCS_FOLDER = docs
- PINS_SECTION = DART-MX8M_PINS_SECTION
- DEMOS_SECTION = DART-MX8M_DEMOS_SECTION
- DTBS_SECTION = DART-MX8M_DTBS_SECTION
- MEMORY_TYPES_SECTION = DART-MX8M_MEMORY-TYPES_VAR_SECTION
- JTAG_SECTION = DART-MX8M_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK i.MX 8M Devices.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MQ
DART-MX8M-MINI
Sections
Available dtbs
To allow Cortex M4 accessing shared resources without experiencing Linux kernel conflicts, a dedicated device tree must be loaded, containing m4 label in the name, using the fdt_file environment variable in uboot.
fsl-imx8mm-var-dart-m4.dtb
This device tree disables some of the base device tree nodes in order to avoid conflicts between the main processor and Cortex M4.
Customers loading TCM binaries are suggest to avoid using uboot branch imx_v2019.04_4.19.35_1.1.0-var01 (Yocto Warrior BSP) due to a know limitation accessing the TCM memory region. As temporary workaround, either use Yocto Sumo BSP or just pick Yocto Sumo uboot
Default M4 pins
Default M4 pins used by the demos are:
| function | pin |
|---|---|
| debug UART (UART2) | RX: J12.6 / TX: J12.4 |
| GPIO (GPIO4_IO03) | LED7 |
| I2C (I2C4) | SCL: J12.17 / SDA: J12.19 |
| PWM (PWM2) | J14.3 |
Default M4 pins v2
Default M4 pins used by the demos are:
| function | SoC balls | DART-MX8M-MINI pins | DT8MCB pins | VAR-SOM-MX8M-MINI pins | Symphony pins | notes |
|---|---|---|---|---|---|---|
| UART3 RX/TX | E18 / D18 | J2.87 / J2.89 | J12.11 / J12.13 | J1.175 / J1.124 | J18.5 / J18.3 | |
| GPIO4_IO03 | AF15 | J2.59 | GPLED1 | J1.84 | J17.3 | |
| I2C4 SCL/SDA | D13 / E13 | J1.17 / J1.19 | J12.17/ J12.19 | J1.174 / J1.176 | J16.10 / J16.12 | |
| PWM3 | AF9 | J3.36 | J14.7 | J1.69 | J18.2 | |
| SPI1 CS0/SCK/SDI/SDO | B6 / D6 / A7 / B7 | J2.79 / J2.77 / J2.81 / J2.83 | J16.4/ J16.2 / J16.8 / J16.6 | J1.39 / J1.43 / J1.41 / J1.45 | J16.4/ J16.2 / J16.6 / J16.8 | enablind it SPI devices will be no longer visible from Linux |
Available Demos
- driver_examples/i2c/interrupt_b2b_transfer/slave
- driver_examples/i2c/interrupt_b2b_transfer/master
- driver_examples/i2c/polling_b2b_transfer/slave
- driver_examples/i2c/polling_b2b_transfer/master
- driver_examples/wdog
- driver_examples/sdma/scatter_gather
- driver_examples/sdma/memory_to_memory
- driver_examples/gpio/led_output
- driver_examples/pwm
- driver_examples/uart/auto_baudrate_detect
- driver_examples/uart/interrupt
- driver_examples/uart/idle_detect_sdma_transfer
- driver_examples/uart/interrupt_rb_transfer
- driver_examples/uart/sdma_transfer
- driver_examples/uart/polling
- driver_examples/uart/interrupt_transfer
- driver_examples/gpt/timer
- driver_examples/gpt/capture
- driver_examples/ecspi/ecspi_loopback
- driver_examples/ecspi/interrupt_b2b_transfer/slave
- driver_examples/ecspi/interrupt_b2b_transfer/master
- driver_examples/ecspi/polling_b2b_transfer/slave
- driver_examples/ecspi/polling_b2b_transfer/master
- driver_examples/rdc
- driver_examples/tmu_1/monitor_threshold
- driver_examples/tmu_1/temperature_polling
- driver_examples/sema4/uboot
- rtos_examples/freertos_ecspi/ecspi_loopback
- rtos_examples/freertos_hello
- rtos_examples/freertos_queue
- rtos_examples/freertos_sem
- rtos_examples/freertos_generic
- rtos_examples/freertos_uart
- rtos_examples/freertos_tickless
- rtos_examples/freertos_mutex
- rtos_examples/freertos_event
- rtos_examples/freertos_swtimer
- rtos_examples/freertos_i2c
- cmsis_driver_examples/i2c/int_b2b_transfer/slave
- cmsis_driver_examples/i2c/int_b2b_transfer/master
- cmsis_driver_examples/uart/sdma_transfer
- cmsis_driver_examples/uart/interrupt_transfer
- cmsis_driver_examples/ecspi/int_loopback_transfer
- cmsis_driver_examples/ecspi/sdma_loopback_transfer
- multicore_examples/rpmsg_lite_str_echo_rtos
- multicore_examples/rpmsg_lite_pingpong_rtos/linux_remote
- demo_apps/hello_world
Releases
mcuxpresso-2.5.0-mx8mm-v1.0
- HARDWARE_NAME = DART-MX8M-MINI
- RELEASE_NAME = mcuxpresso-2.5.0-mx8mm-v1.0
- RELEASE_LINK = MCUXPRESSO_2.5.0_V1.0_DART-MX8M-MINI
- MCUXPRESSO_VERSION = 2.5.0
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.5.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/dart_mx8mm
- DOCS_FOLDER = docs
- PINS_SECTION = DART-MX8M-MINI_PINS_SECTION
- DEMOS_SECTION = DART-MX8M-MINI_DEMOS_SECTION
- DTBS_SECTION = DART-MX8M-MINI_DTBS_SECTION
- MEMORY_TYPES_SECTION = DART-MX8M_MEMORY-TYPES_VAR_SECTION
- JTAG_SECTION = DART-MX8M_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for i.MX 8M Mini.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MM
mcuxpresso-2.8.0-mx8mm-v1.0
- HARDWARE_NAME = DART-MX8M-MINI
- RELEASE_NAME = mcuxpresso-2.8.0-mx8mm-v1.0
- RELEASE_LINK = MCUXPRESSO_2.8.0_V1.0_DART-MX8M-MINI
- MCUXPRESSO_VERSION = 2.8.0
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.8.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/dart_mx8mm
- DOCS_FOLDER = docs
- PINS_SECTION = DART-MX8M-MINI_PINS_SECTION
- DEMOS_SECTION = DART-MX8M-MINI_DEMOS_SECTION
- DTBS_SECTION = DART-MX8M-MINI_DTBS_SECTION
- MEMORY_TYPES_SECTION = DART-MX8M_MEMORY-TYPES_VAR_SECTION
- JTAG_SECTION = DART-MX8M_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for i.MX 8M Mini.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MM
mcuxpresso-2.5.0-mx8mm-v1.1
- HARDWARE_NAME = DART-MX8M-MINI
- RELEASE_NAME = mcuxpresso-2.5.0-mx8mm-v1.1
- RELEASE_LINK = MCUXPRESSO_2.5.0_V1.1_DART-MX8M-MINI
- MCUXPRESSO_VERSION = 2.5.0
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.5.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/dart_mx8mm
- DOCS_FOLDER = docs
- PINS_SECTION = DART-MX8M-MINI_PINS_SECTION_V2
- DEMOS_SECTION = DART-MX8M-MINI_DEMOS_SECTION
- DTBS_SECTION = DART-MX8M-MINI_DTBS_SECTION
- MEMORY_TYPES_SECTION = DART-MX8M_MEMORY-TYPES_VAR_SECTION
- JTAG_SECTION = DART-MX8M_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for i.MX 8M Mini.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MM
mcuxpresso-2.8.0-mx8mm-v1.1
- HARDWARE_NAME = DART-MX8M-MINI
- RELEASE_NAME = mcuxpresso-2.8.0-mx8mm-v1.1
- RELEASE_LINK = MCUXPRESSO_2.8.0_V1.1_DART-MX8M-MINI
- MCUXPRESSO_VERSION = 2.8.0
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.8.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/dart_mx8mm
- DOCS_FOLDER = docs
- PINS_SECTION = DART-MX8M-MINI_PINS_SECTION_V2
- DEMOS_SECTION = DART-MX8M-MINI_DEMOS_SECTION
- DTBS_SECTION = DART-MX8M-MINI_DTBS_SECTION
- MEMORY_TYPES_SECTION = DART-MX8M_MEMORY-TYPES_VAR_SECTION
- JTAG_SECTION = DART-MX8M_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for i.MX 8M Mini.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MM
VAR-SOM-MX8M-NANO
Sections
Available dtbs
To allow Cortex M7 accessing shared resources without experiencing Linux kernel conflicts, a dedicated device tree must be loaded, containing m7 label in the name, using the fdt_file environment variable in uboot.
fsl-imx8mn-var-som-m7.dtb # for newer SoMs fsl-imx8mn-var-som-rev10-m7.dtb # for older SoMs rev1.0
This device tree disables some of the base device tree nodes in order to avoid conflicts between the main processor and Cortex M7.
Default M7 pins
Default M7 pins used by the demos are:
| function | SoC balls | VAR-SOM-MX8M-NANO pins | Symphony pins | notes |
|---|---|---|---|---|
| UART3 RX/TX | E18 / D18 | J1.175 / J1.124 | J18.5 / J18.3 | |
| GPIO4_IO23 | AC24 | J1.21 | J16.5 | |
| I2C4 SCL/SDA | D13 / E13 | J1.174 / J1.176 | J16.10 / J16.12 | |
| PWM3 | AF9 | J1.69 | J18.2 | |
| SPI1 CS0/SCK/SDI/SDO | B6 / D6 / A7 / B7 | J1.39 / J1.43 / J1.41 / J1.45 | J16.4/ J16.2 / J16.6 / J16.8 | enablind it SPI devices will be no longer visible from Linux |
Available Demos
- driver_examples/i2c/interrupt_b2b_transfer/slave
- driver_examples/i2c/interrupt_b2b_transfer/master
- driver_examples/i2c/polling_b2b_transfer/slave
- driver_examples/i2c/polling_b2b_transfer/master
- driver_examples/wdog
- driver_examples/sdma/scatter_gather
- driver_examples/sdma/memory_to_memory
- driver_examples/gpio/led_output
- driver_examples/pwm
- driver_examples/uart/auto_baudrate_detect
- driver_examples/uart/interrupt
- driver_examples/uart/idle_detect_sdma_transfer
- driver_examples/uart/interrupt_rb_transfer
- driver_examples/uart/sdma_transfer
- driver_examples/uart/polling
- driver_examples/uart/interrupt_transfer
- driver_examples/gpt/timer
- driver_examples/gpt/capture
- driver_examples/ecspi/ecspi_loopback
- driver_examples/ecspi/interrupt_b2b_transfer/slave
- driver_examples/ecspi/interrupt_b2b_transfer/master
- driver_examples/ecspi/polling_b2b_transfer/slave
- driver_examples/ecspi/polling_b2b_transfer/master
- driver_examples/rdc
- driver_examples/tmu_1/monitor_threshold
- driver_examples/tmu_1/temperature_polling
- driver_examples/sema4/uboot
- rtos_examples/freertos_ecspi/ecspi_loopback
- rtos_examples/freertos_hello
- rtos_examples/freertos_queue
- rtos_examples/freertos_sem
- rtos_examples/freertos_generic
- rtos_examples/freertos_uart
- rtos_examples/freertos_tickless
- rtos_examples/freertos_mutex
- rtos_examples/freertos_event
- rtos_examples/freertos_swtimer
- rtos_examples/freertos_i2c
- cmsis_driver_examples/i2c/int_b2b_transfer/slave
- cmsis_driver_examples/i2c/int_b2b_transfer/master
- cmsis_driver_examples/uart/sdma_transfer
- cmsis_driver_examples/uart/interrupt_transfer
- cmsis_driver_examples/ecspi/int_loopback_transfer
- cmsis_driver_examples/ecspi/sdma_loopback_transfer
- multicore_examples/rpmsg_lite_str_echo_rtos
- multicore_examples/rpmsg_lite_pingpong_rtos/linux_remote
- demo_apps/hello_world
Memory types
The SDK allow linking using 2 different memory types: DDR, TCM.
Here is available a short summary of memory areas used by Cortex-M7 as described in related linker file.
| memory type | M7 memory area | A53 memory area | memory lentgh | linker file |
|---|---|---|---|---|
| DDR | 0x7E000000-0x7E1FFFFF (code) 0x7E200000-0x7E3FFFFF (data) 0x7E400000-0x7EFFFFFF (data2) |
0x7E000000-0x7E1FFFFF (code) 0x7E200000-0x7E3FFFFF (data) 0x7E400000-0x7EFFFFFF (data2) |
16MB (DDR) | MIMX8MN6xxxxx_cm7_ddr_ram.ld |
| TCM | 0x00000000-0x0001FFFF (code) 0x20000000-0x2001FFFF (data) 0x7E000000-0x7EFFFFFF (data2) |
0x007E0000-0x007FFFFF (code) 0x00800000-0x0081FFFF (data) 0x7E000000-0x7EFFFFFF (data2) |
256kB (TCM) + 16MB (DDR) | MIMX8MN6xxxxx_cm7_ram.ld |
All linker files are locate in the armgcc folder of each demo.
The DDR reserved area must much the one declared in the kernel device tree: at least 1 GB of RAM is required on the SoM to allow Cortex-M7 accessing the range 0x7E000000 - 0x7EFFFFFF. For some reason, Cortex-M7 is not able to access RAM locations below 0x60000000: SoMs with 512 MB of RAM are not suitable to use Cortex-M7.
The RPMSG area is located at 0x40000000: all SoMs allow Cortex-M7 accessing the RPMSG area.
After launching the build_all.sh command the following folder will be created in the armgcc folder
- ddr_debug: containing DDR binaries compiled in debug mode (not stripped: symbols available)
- ddr_release: containing DDR binaries compiled in release mode (stripped: no symbols available)
- debug: containing TCM binaries compiled in debug mode (not stripped: symbols available)
- release: containing TCM binaries compiled in release mode (stripped: no symbols available)
Further details about memory mapping are available in i.MX 8M Applications Processors Reference Manual paragraphs:
- 2.1.2 Cortex-A53 Memory Map
- 2.1.3 Cortex-M7 Memory Map
JTAG
VAR-SOM-MX8M-NANO exposes JTAG signals on a header (not assembled by default) on the SOM top left side.
Here the pinout
| pin | signal | description | pin | signal | description |
|---|---|---|---|---|---|
| 1 | JTAG_VREF | JTAG IO reference voltage, connected to SOM_3V3_PER via 150 Ohm. |
2 | JTAG_TMS | JTAG Mode Select signal |
| 3 | GND | Digital Ground | 4 | JTAG_TCK | JTAG Clock signal, include PD of 8.2K Ohm. |
| 5 | GND | Digital Ground | 6 | JTAG_TDO | JTAG Data Out signal |
| 7 | GND | Digital Ground | 8 | JTAG_TDI | JTAG Data In signal |
| 9 | JTAG_TRST_B | JTAG Reset signal, active low signal |
10 | POR_B | Programmer Reset, used to put the SOC in reset state. |
Please refer to SoM datasheet for further details.
Releases
mcuxpresso-2.7.0-mx8mn-v1.0
- HARDWARE_NAME = VAR-SOM-MX8M-NANO
- SOC_HAS_M7 = true
- RELEASE_NAME = mcuxpresso-2.7.0-mx8mn-v1.0
- RELEASE_LINK = MCUXPRESSO_2.7.0_V1.0_VAR-SOM-MX8M-NANO
- MCUXPRESSO_VERSION = 2.7.0
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.7.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/8-2019q3/RC1.1/gcc-arm-none-eabi-8-2019-q3-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-8-2019-q3-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-8-2019-q3-update
- BOARD_FOLDER = boards/som_mx8mn
- DOCS_FOLDER = docs
- PINS_SECTION = VAR-SOM-MX8M-NANO_PINS_SECTION
- DEMOS_SECTION = VAR-SOM-MX8M-NANO_DEMOS_SECTION
- DTBS_SECTION = VAR-SOM-MX8M-NANO_DTBS_SECTION
- MEMORY_TYPES_SECTION = VAR-SOM-MX8MN_MEMORY-TYPES
- JTAG_SECTION = VAR-SOM-MX8MN_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for EVK-MIMX8MN.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MN
mcuxpresso-2.8.0-mx8mn-v1.0
- HARDWARE_NAME = VAR-SOM-MX8M-NANO
- SOC_HAS_M7 = true
- RELEASE_NAME = mcuxpresso-2.8.0-mx8mn-v1.0
- RELEASE_LINK = MCUXPRESSO_2.8.0_V1.0_VAR-SOM-MX8M-NANO
- MCUXPRESSO_VERSION = 2.8.0
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.8.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/8-2019q3/RC1.1/gcc-arm-none-eabi-8-2019-q3-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-8-2019-q3-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-8-2019-q3-update
- BOARD_FOLDER = boards/som_mx8mn
- DOCS_FOLDER = docs
- PINS_SECTION = VAR-SOM-MX8M-NANO_PINS_SECTION
- DEMOS_SECTION = VAR-SOM-MX8M-NANO_DEMOS_SECTION
- DTBS_SECTION = VAR-SOM-MX8M-NANO_DTBS_SECTION
- MEMORY_TYPES_SECTION = VAR-SOM-MX8MN_MEMORY-TYPES
- JTAG_SECTION = VAR-SOM-MX8MN_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for EVK-MIMX8MN.pdf
- NXP_REFERENCE_KIT = EVK-MIMX8MN
VAR-SOM-MX8X
Sections
Default M4 pins
Default M4 pins used by the demos are:
| function | pin |
|---|---|
| debug UART (UART2) | RX: J18.5 / TX: J18.3 |
| I2C (I2C3) | SCL: J16.10 / SDA: J16.12 |
| M4 GPIO (M40_GPIO0_IO00) | J16.3 |
| M4 PWM (M40_TPM0_CH0) | J16.7 |
Available Demos
- cmsis_driver_examples/lpi2c/int_b2b_transfer/slave
- cmsis_driver_examples/lpi2c/int_b2b_transfer/master
- cmsis_driver_examples/lpi2c/edma_b2b_transfer/slave
- cmsis_driver_examples/lpi2c/edma_b2b_transfer/master
- cmsis_driver_examples/lpuart/edma_transfer
- cmsis_driver_examples/lpuart/interrupt_transfer
- demo_apps/hello_world
- driver_examples/edma/scatter_gather
- driver_examples/edma/memory_to_memory
- driver_examples/intmux
- driver_examples/lpi2c/edma_b2b_transfer/slave
- driver_examples/lpi2c/edma_b2b_transfer/master
- driver_examples/lpi2c/interrupt_b2b_transfer/slave
- driver_examples/lpi2c/interrupt_b2b_transfer/master
- driver_examples/lpi2c/polling_b2b_transfer/slave
- driver_examples/lpi2c/polling_b2b_transfer/master
- driver_examples/lpi2c/read_accel_value_transfer
- driver_examples/lpit
- driver_examples/lpuart/edma_transfer
- driver_examples/lpuart/interrupt_rb_transfer
- driver_examples/lpuart/polling
- driver_examples/lpuart/interrupt_transfer
- driver_examples/rgpio/led_output
- driver_examples/sema42/uboot
- driver_examples/tpm/input_capture
- driver_examples/tpm/dual_edge_capture
- driver_examples/tpm/timer
- driver_examples/tpm/simple_pwm
- driver_examples/tpm/output_compare
- driver_examples/tstmr
- driver_examples/wdog32
- mmcau_examples/mmcau_api
- multicore_examples/rpmsg_lite_pingpong_rtos/linux_remote
- multicore_examples/rpmsg_lite_str_echo_rtos
- rtos_examples/freertos_hello
- rtos_examples/freertos_queue
- rtos_examples/freertos_sem
- rtos_examples/freertos_generic
- rtos_examples/freertos_tickless
- rtos_examples/freertos_mutex
- rtos_examples/freertos_lpuart
- rtos_examples/freertos_event
- rtos_examples/freertos_swtimer
Additional demos are available as reference code, but require HW/SW customization.
NXP Memory types
The SDK allow linking using 2 different memory types: DDR, TCM.
Here is available a short summary of memory areas used by Cortex-M4 as described in related linker file.
| memory type | M4 memory area | A35 memory area | memory lentgh | linker file |
|---|---|---|---|---|
| DDR | 0x88000000-0x881FFFFF (code) 0x88200000-0x883FFFFF (data) 0x88400000-0x8FFFFFFF (data2) |
0x88000000-0x881FFFFF (code) 0x88200000-0x883FFFFF (data) 0x88400000-0x8FFFFFFF (data2) |
128MB (DDR) | MIMX8QX6xxxFZ_cm4_ddr_ram.ld |
| TCM | 0x1FFE0000-0x1FFFFFFF (code) 0x20000000-0x2001FFFF (data) 0x88000000-0x8FFFFFFF (data2) |
0x34FE0000-0x34FFFFFF (code) 0x35000000-0x3501FFFF (data) 0x88000000-0x8FFFFFFF (data2) |
256kB (TCM) + 128MB (DDR) | MIMX8QX6xxxFZ_cm4_ram.ld |
All linker files are locate in the armgcc folder of each demo.
After launching the build_all.sh command the following folder will be created in the armgcc folder
- ddr_debug: containing DDR binaries compiled in debug mode (not stripped: symbols available)
- ddr_release: containing DDR binaries compiled in release mode (stripped: no symbols available)
- debug: containing TCM binaries compiled in debug mode (not stripped: symbols available)
- release: containing TCM binaries compiled in release mode (stripped: no symbols available)
Further details about memory mapping are available in i.MX 8DualXPlus/8QuadXPlus Applications Processor Reference Manual paragraphs:
- 2.2 System Memory Map
- 2.2.9 Cortex-M4 Memory Map
JTAG
The VAR-SOM-MX8X exposes JTAG interface via an optional 10-pin header
Here the pinout
| pin | signal | description | pin | signal (ball) | description |
|---|---|---|---|---|---|
| 1 | JTAG_VREF | JTAG reference voltage (3.3V) | 2 | JTAG_TMS (AG35) | JTAG Mode Select |
| 3 | GND | Digital Ground | 4 | JTAG_TCK (AE31) | JTAG Clock |
| 5 | GND | Digital Ground | 6 | JTAG_TDO (AF32) | JTAG Data Out |
| 7 | RTCK | JTAG Return clock | 8 | JTAG_TDI (AH34) | JTAG Data In |
| 9 | JTAG_TRST_B_CONN | JTAG TAP reset | 10 | JTAG_SRST_B | JTAG System reset |
Please refer to SOM datasheet for further details.
Releases
mcuxpresso-2.5.2-mx8qx-v1.0
*HARDWARE_NAME = VAR-SOM-MX8X
- SOC_HAS_SCU = true
- RELEASE_NAME = mcuxpresso-2.5.2-mx8qx-v1.0
- RELEASE_LINK = MCUXPRESSO_2.5.2_V1.0_VAR-SOM-MX8X
- YOCTO_RELEASE_LINK = RELEASE_SUMO_V1.2_VAR-SOM-MX8X
- MCUXPRESSO_VERSION = 2.5.2
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.5.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/som_mx8qx
- DOCS_FOLDER = docs
- PINS_SECTION = VAR-SOM-MX8X_PINS_SECTION
- DEMOS_SECTION = VAR-SOM-MX8X_DEMOS_SECTION
- DTBS_SECTION = VAR-SOM-MX8X_DTBS_SECTION
- MEMORY_TYPES_SECTION = VAR-SOM-MX8X_MEMORY-TYPES_NXP_SECTION
- JTAG_SECTION = VAR-SOM-MX8X_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for i.MX 8QuadXPlus.pdf
- NXP_REFERENCE_KIT = IMX8QXP-MEK
- SCFW_SOC = = mx8qx_b0
- SCFW_PATCH_URL = = ftp://customerv:Variscite1@ftp.variscite.com/VAR-SOM-MX8X/Software/SCFW
- SCFW_M4_PATCH = = 0002-mx8qxp-var-som_scfw-1.2.2_sample-M4-customization.diff
- IMX_MKIMAGE_SOC = = iMX8QX
VAR-SOM-MX8
Sections
Default M4 pins
Default M4 pins used by the demos are:
| function | SoC balls | VAR-SOM-MX8 pins | Symphony pins | SPEAR-MX8 pins | SP8CustomBoard pins | notes |
|---|---|---|---|---|---|---|
| M40_UART0 RX / TX | AM44 / AU51 | N/A | N/A | J3.32 / J3.38 | J40 | SP8CustomBoard requires SW8 ON, SW9 OFF |
| DMA_UART2 RX / TX | BE35 / BE37 | J1.175 / J1.124 | J18.5 / J18.3 | J1.80 / J1.82 | J26.19 /J26.17 | |
| DMA_UART4 RX / TX | AR47 / AU53 | J1.115 / J1.171 | J18.9 / J18.7 | J3.34 / J3.29 | J20.2 / J20.4 | SPEAR-MX8 demos do not refer it |
| FLEXCAN0 RX/TX | C5 / H6 | J1.46 / J1.44 | J16.18 / J16.20 | J4.79 / J4.80 | J26.1 / J26.3 | |
| M41_I2C0 SCL/SDA | AR45 / AU49 | N/A | N/A | J1.9 / J3.36 | J20.18 / J20.20 | |
| DMA_I2C0 SCL/SDA | BN9 / BN7 | J1.174 / J1.176 | J16.10 / J16.12 | J2.88 / J1.90 | J26.2 / J26.4 | |
| DMA_SPI0 CS0 / SCK / SDI / SDO | BC1 / BB4 / BA5 / AY6 | J1.79 / J1.75 / J1.77 / J1.70 | J17.10 / J17.6 / J17.8 / J17.4 | J2.78 / j2.74 / J2.72 / J2.76 | J20.7 / J20.1 / J20.5 / J20.3 | |
| ADC_IN6 | AL9 | J1.39 | J16.4 | J4.62 | J29.16 | VAR-SOM-MX8 requires enabling a buffer (refer to the datasheet) |
| M40_TPM0 0 / 1 | AR47 / AU53 | J1.115 / J1.171 | J18.9 / J18.7 | J3.34 / J3.29 | J20.2 / J20.4 | pins are share with with DMA_UART4 |
| GPIO3_IO06 | BA3 | J1.40 | J17.2 | J2.80 | J20.9 |
Available Demos
- cmsis_driver_examples/lpi2c/int_b2b_transfer/slave
- cmsis_driver_examples/lpi2c/int_b2b_transfer/master
- cmsis_driver_examples/lpi2c/edma_b2b_transfer/slave
- cmsis_driver_examples/lpi2c/edma_b2b_transfer/master
- cmsis_driver_examples/lpuart/edma_transfer
- cmsis_driver_examples/lpuart/interrupt_transfer
- demo_apps/hello_world
- driver_examples/edma/scatter_gather
- driver_examples/edma/memory_to_memory
- driver_examples/intmux
- driver_examples/lpi2c/edma_b2b_transfer/slave
- driver_examples/lpi2c/edma_b2b_transfer/master
- driver_examples/lpi2c/interrupt_b2b_transfer/slave
- driver_examples/lpi2c/interrupt_b2b_transfer/master
- driver_examples/lpi2c/polling_b2b_transfer/slave
- driver_examples/lpi2c/polling_b2b_transfer/master
- driver_examples/lpi2c/read_accel_value_transfer
- driver_examples/lpit
- driver_examples/lpuart/edma_transfer
- driver_examples/lpuart/interrupt_rb_transfer
- driver_examples/lpuart/polling
- driver_examples/lpuart/interrupt_transfer
- driver_examples/rgpio/led_output
- driver_examples/sema42/uboot
- driver_examples/tpm/input_capture
- driver_examples/tpm/dual_edge_capture
- driver_examples/tpm/timer
- driver_examples/tpm/simple_pwm
- driver_examples/tpm/output_compare
- driver_examples/tstmr
- driver_examples/wdog32
- mmcau_examples/mmcau_api
- multicore_examples/rpmsg_lite_pingpong_rtos/linux_remote
- multicore_examples/rpmsg_lite_str_echo_rtos
- rtos_examples/freertos_hello
- rtos_examples/freertos_queue
- rtos_examples/freertos_sem
- rtos_examples/freertos_generic
- rtos_examples/freertos_tickless
- rtos_examples/freertos_mutex
- rtos_examples/freertos_lpuart
- rtos_examples/freertos_event
- rtos_examples/freertos_swtimer
Additional demos are available as reference code, but require HW/SW customization.
if needed, RPMSG functionality require applying the following kernel patch
diff --git a/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-som-common.dtsi b/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-som-common.dtsi
index 1814a639d8f0..dcc12eb85c0a 100644
--- a/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-som-common.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-som-common.dtsi
@@ -1205,28 +1205,28 @@
};
&intmux_cm40 {
- status = "okay";
+ status = "didabled";
};
&rpmsg{
/*
* 64K for one rpmsg instance:
*/
- vdev-nums = <1>;
- reg = <0x0 0x90000000 0x0 0x10000>;
+ vdev-nums = <2>;
+ reg = <0x0 0x90000000 0x0 0x20000>;
status = "okay";
};
&intmux_cm41 {
- status = "okay";
+ status = "disabled";
};
&rpmsg1{
/*
* 64K for one rpmsg instance:
*/
- vdev-nums = <1>;
- reg = <0x0 0x90100000 0x0 0x10000>;
+ vdev-nums = <2>;
+ reg = <0x0 0x90100000 0x0 0x20000>;
status = "okay";
};
diff --git a/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-spear-common.dtsi b/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-spear-common.dtsi
index 982da0e412f8..5df8783e56aa 100644
--- a/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-spear-common.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-imx8qm-var-spear-common.dtsi
@@ -1357,28 +1357,28 @@
};
&intmux_cm40 {
- status = "okay";
+ status = "didabled";
};
&rpmsg {
/*
* 64K for one rpmsg instance:
*/
- vdev-nums = <1>;
- reg = <0x0 0x90000000 0x0 0x10000>;
+ vdev-nums = <2>;
+ reg = <0x0 0x90000000 0x0 0x20000>;
status = "okay";
};
&intmux_cm41 {
- status = "okay";
+ status = "disabled";
};
&rpmsg1 {
/*
* 64K for one rpmsg instance:
*/
- vdev-nums = <1>;
- reg = <0x0 0x90100000 0x0 0x10000>;
+ vdev-nums = <2>;
+ reg = <0x0 0x90100000 0x0 0x20000>;
status = "okay";
};
NXP Memory types
The SDK allow linking using 2 different memory types: DDR, TCM.
Here is available a short summary of memory areas used by Cortex-M4 as described in related linker file.
| memory type | M4 if | M4 memory area | memory lentgh | linker file |
|---|---|---|---|---|
| DDR | 0 | 0x88000000-0x881FFFFF (code) 0x88200000-0x883FFFFF (data) 0x88400000-0x887FFFFF (data2) |
8MB (DDR) | MIMX8QM6xxxFF_cm4_core0_ddr_ram.ld |
| DDR | 1 | 0x88800000-0x88BFFFFF (code) 0x88C00000-0x88FFFFFF (data) 0x89000000-0x8FFFFFFF (data2) |
120MB (DDR) | MIMX8QM6xxxFF_cm4_core1_ddr_ram.ld |
| TCM | 0 | 0x1FFE0000-0x1FFFFFFF (code) 0x20000000-0x2001FFFF (data) 0x88000000-0x887FFFFF (data2) |
256kB (TCM) + 8MB (DDR) | MIMX8QM6xxxFF_cm4_core0_ram.ld |
| TCM | 1 | 0x1FFE0000-0x1FFFFFFF (code) 0x20000000-0x2001FFFF (data) 0x88800000-0x8FFFFFFF (data2) |
256kB (TCM) + 120MB (DDR) | MIMX8QM6xxxFF_cm4_core1_ram.ld |
All linker files are locate in the armgcc folder of each demo.
After launching the build_all.sh command the following folder will be created in the armgcc folder
- ddr_debug: containing DDR binaries compiled in debug mode (not stripped: symbols available)
- ddr_release: containing DDR binaries compiled in release mode (stripped: no symbols available)
- debug: containing TCM binaries compiled in debug mode (not stripped: symbols available)
- release: containing TCM binaries compiled in release mode (stripped: no symbols available)
JTAG
The VAR-SOM-MX8 and SPEAR-MX8 exposes JTAG interface via an optional 10-pin header
Here the pinout
| pin | signal | description | pin | signal (ball) | description |
|---|---|---|---|---|---|
| 1 | JTAG_VREF | JTAG reference voltage (3.3V) | 2 | JTAG_TMS (AG35) | JTAG Mode Select |
| 3 | GND | Digital Ground | 4 | JTAG_TCK (AE31) | JTAG Clock |
| 5 | GND | Digital Ground | 6 | JTAG_TDO (AF32) | JTAG Data Out |
| 7 | RTCK | JTAG Return clock | 8 | JTAG_TDI (AH34) | JTAG Data In |
| 9 | JTAG_TRST_B_CONN | JTAG TAP reset | 10 | JTAG_SRST_B | JTAG System reset |
Please refer to SOM datasheet for further details.
Releases
mcuxpresso-2.5.2-mx8qm-v1.0
*HARDWARE_NAME = VAR-SOM-MX8
- SOC_HAS_SCU = true
- SOC_HAS_M40_M41 = true
- RELEASE_NAME = mcuxpresso-2.5.2-mx8qm-v1.0
- RELEASE_LINK = MCUXPRESSO_2.5.2_V1.0_VAR-SOM-MX8
- YOCTO_RELEASE_LINK = RELEASE_SUMO_V1.2_VAR-SOM-MX8
- MCUXPRESSO_VERSION = 2.5.2
- SDK_PATH = ~/var-mcuxpresso
- SDK_GIT_URL = https://github.com/varigit/freertos-variscite
- SDK_GIT_BRANCH = mcuxpresso_sdk_2.5.x-var01
- TOOLCHAIN_URL = https://developer.arm.com/-/media/Files/downloads/gnu-rm/7-2018q2/gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_BZ2_NAME = gcc-arm-none-eabi-7-2018-q2-update-linux.tar.bz2
- TOOLCHAIN_FOLDER = gcc-arm-none-eabi-7-2018-q2-update
- BOARD_FOLDER = boards/som_mx8qm
- DOCS_FOLDER = docs
- PINS_SECTION = VAR-SOM-MX8_PINS_SECTION
- DEMOS_SECTION = VAR-SOM-MX8_DEMOS_SECTION
- DTBS_SECTION = VAR-SOM-MX8_DTBS_SECTION
- MEMORY_TYPES_SECTION = VAR-SOM-MX8_MEMORY-TYPES_NXP_SECTION
- JTAG_SECTION = VAR-SOM-MX8_JTAG_SECTION
- NXP_USER_GUIDE = Getting Started with MCUXpresso SDK for i.MX 8QuadMax.pdf
- NXP_REFERENCE_KIT = IMX8QM-MEK
- SCFW_SOC = = mx8qm_b0
- SCFW_DEFINES_URL = = https://github.com/varigit/imx-sc-firmware/blob/1.2.8/src/scfw_export_mx8qm_b0/platform/board/mx8qm_var_som/board.c#L79
- IMX_MKIMAGE_SOC = = iMX8QM