Imx usb loader
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Booting from USB using the imx_usb_loader utility
imx_loader is an open source utility by Boundary Devices that allows to download and execute code on NXP i.MX5/i.MX6/i.MX7 and Vybrid SoCs through the Serial Download Protocol (SDP).
Most commonly it is used as a replacement for NXP's MFGTOOL to load SPL and U-Boot via the USB OTG port.
All Variscite SOMs are shipped with SPL and U-Boot pre-programmed on the SOM's internal storage.
In addition, all Variscite carrier boards have an SD card slot, and even in the unlikely event of the SPL/U-Boot being erased from the SOM's internal storage, the SOM can always be booted from an SD card (like our recovery SD card, for example).
So, generally, this utility is not needed, however, it is yet another option that can be used to boot the Variscite SOMs, for anyone who is interested.
2 Step by step usage instructions
Download and install the imx_usb_loader utility:
$ sudo apt-get install libusb-1.0-0-dev $ cd ~ $ git clone https://github.com/boundarydevices/imx_usb_loader.git $ cd imx_usb_loader $ git reset --hard c598fd14d67 $ make
Build U-Boot using the defconfig for SD card/eMMC.
You can follow the "Build U-Boot from source code" instructions .
Copy the SPL and U-Boot images to the imx_usb_loader directory:
$ cp -v SPL u-boot.img ~/imx_usb_loader
Configure imx_usb to load SPL and u-boot.img consecutively:
$ cd ~/imx_usb_loader
Edit the imx_usb.conf file, and prepend the following lines to it:
#imx6dq/dqp 0x15a2:0x0054, mx6_usb_rom.conf, 0x0525:0xb4a4, mx6_usb_sdp_spl.conf #imx6s/dl 0x15a2:0x0061, mx6_usb_rom.conf, 0x0525:0xb4a4, mx6_usb_sdp_spl.conf #imx6ul 0x15a2:0x007d, mx6_usb_rom.conf, 0x0525:0xb4a4, mx6_usb_sdp_spl.conf #imx6ull 0x15a2:0x0080, mx6_usb_rom.conf, 0x0525:0xb4a4, mx6_usb_sdp_spl.conf
Create a file called mx6_usb_rom.conf with the following content:
(the content is the same as mx6_usb_work.conf, with an 'SPL:jump header2' line appended to it)
mx6_qsb hid,1024,0x910000,0x10000000,1G,0x00900000,0x40000 SPL:jump header2
Edit the mx6_usb_sdp_spl.conf file, and append the following line to it:
Boot the board into serial download mode:
to SD card, while not having an actual card inserted in its slot.
Alternatively, set the board boot mode to eMMC/NAND flash, when the eMMC/NAND flash does not contain a bootloader.
Connect the board to your host PC via the USB OTG port, and power on the board.
The board should be recognized on the host as a "Freescale SemiConductor Inc SE Blank ARIK" (or something similar).
(Note: If your board only has a regular USB type-A connector and doesn't have a USB Micro-AB receptacle, you can use a "male USB type-A to male USB type-A" cable)
Run imx_usb to load SPL and U-Boot on the board:
$ sudo ./imx_usb
The board should now run SPL and U-Boot.
You can see its output on the console via the debug port, as always.
- The default boot command when booting from USB is bootcmd_mfg. It can be defined in the board's default env (we leave it empty by default).