Debian Edit Modify Build and Flash U-Boot: Difference between revisions

From Variscite Wiki
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Transfer the newly created bootloader file   
Transfer the newly created bootloader file   
{{#ifeq: {{#var:SOC_SERIES}}|imx8|
{{#ifeq: {{#var:SOC_SERIES}}|imx8|
{{#var:U-BOOT_SD_IMAGE_NAME}}  
'''{{#var:U-BOOT_SD_IMAGE_NAME}}'''
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SPL and u-boot.img  
'''SPL and u-boot.img'''
}}
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Revision as of 19:26, 15 July 2020

DART-MX8M-MINI - Debian U-Boot Customization


Making Changes to U-Boot

$ cd ~/var_mx8mm_dart_debian_buster/src/uboot-imx
$ gedit board/variscite/mx8mm_var_dart/mx8mm_var_dart.c
$ gedit include/configs/mx8mm_var_dart.h

For example, we want to change the default environment variable,

"netargs=setenv bootargs ${jh_clk} console=${console} " \
		"root=/dev/nfs ${cma_size} " \
		"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0" \

To

"netargs=setenv bootargs ${jh_clk} console=${console} " \
		"root=/dev/nfs ${cma_size} " \
		"ip=dhcp serverip=192.168.0.34 nfsroot=${serverip}:${nfsroot},v3,tcp\0" \

Here above example sets the serverip to 192.168.0.34,

Building Bootloader

To build a bootloader run below commands on host machine.

$ cd ~/var_mx8mm_dart_debian_buster
$ sudo MACHINE=imx8mm-var-dart ./var_make_debian.sh -c bootloader


Flashing New Bootloader to target eMMC via network

Transfer the newly created bootloader file imx-boot-sd.bin

From

~/var_mx8mm_dart_debian_buster/output/ to running target to flash it on the eMMC. 

For example $scp ~/var_mx8mm_dart_debian_buster/output/imx-boot-sd.bin root@192.168.0.36:/tmp/

Change 192.168.0.36 to your target board IP.

# dd if=/tmp/ of=/dev/mmcblk2 bs=1K seek=33; sync

Flashing New Bootloader to SD card

To flash the newly created bootloader on the SD Card

$ sudo dd if=imx-boot-sd.bin of=/dev/sdX bs=1K seek=33 conv=fsync

Flashing using recovery sdcard

If you want to use our recovery SD card to flash the built U-Boot to NAND flash/eMMC, then copy it to the appropriate location in the SD card:

$ sudo cp imx-boot-sd.bin /media/rootfs/opt/images/Debian/

And eject the SD card gracefully from host machine.


Note: If you manually upgrade an existing U-Boot, and you have an old environment saved, it is a good idea to reset your environment to the new default (see Environment handling commands)