mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
07f6ddb67a
Add support for Falcon mode and explain in the README the steps to boot the kernel directly without loading the full U-Boot. Signed-off-by: Diego Dorta <diego.dorta@nxp.com> Acked-by: Fabio Estevam <fabio.estevam@nxp.com>
83 lines
1.9 KiB
Plaintext
83 lines
1.9 KiB
Plaintext
How to use and build U-Boot on mx6sabreauto
|
|
-------------------------------------------
|
|
|
|
mx6sabreauto_defconfig target supports mx6q/mx6dl/mx6qp sabreauto variants.
|
|
|
|
In order to build it:
|
|
|
|
$ make mx6sabreauto_defconfig
|
|
|
|
$ make
|
|
|
|
This will generate the SPL and u-boot.img binaries.
|
|
|
|
- Flash the SPL binary into the SD card:
|
|
|
|
$ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 && sync
|
|
|
|
- Flash the u-boot.img binary into the SD card:
|
|
|
|
$ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69 && sync
|
|
|
|
Booting via Falcon mode
|
|
-----------------------
|
|
|
|
Write in mx6sabreauto_defconfig the following define below:
|
|
|
|
CONFIG_SPL_OS_BOOT=y
|
|
|
|
In order to build it:
|
|
|
|
$ make mx6sabreauto_defconfig
|
|
|
|
$ make
|
|
|
|
This will generate the SPL image called SPL and the u-boot.img.
|
|
|
|
- Flash the SPL image into the SD card:
|
|
|
|
$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 && sync
|
|
|
|
- Flash the u-boot.img image into the SD card:
|
|
|
|
$ sudo dd if=u-boot.img of=/dev/sdb bs=1K seek=69 && sync
|
|
|
|
Create a FAT16 boot partition to store uImage and the dtb file, then copy the files there:
|
|
|
|
$ sudo cp uImage /media/boot
|
|
|
|
$ sudo cp imx6dl-sabreauto.dtb /media/boot
|
|
|
|
Create a partition for root file system and extract it there:
|
|
|
|
$ sudo tar xvf rootfs.tar.gz -C /media/root
|
|
|
|
The SD card must have enough space for raw "args" and "kernel".
|
|
To configure Falcon mode for the first time, on U-Boot do the following commands:
|
|
|
|
- Load dtb file from boot partition:
|
|
|
|
# load mmc 0:1 ${fdt_addr} imx6dl-sabreauto.dtb
|
|
|
|
- Load kernel image from boot partition:
|
|
|
|
# load mmc 0:1 ${loadaddr} uImage
|
|
|
|
- Write kernel at 2MB offset:
|
|
|
|
# mmc write ${loadaddr} 0x1000 0x4000
|
|
|
|
- Setup kernel bootargs:
|
|
|
|
# setenv bootargs "console=ttymxc3,115200 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait quiet rw"
|
|
|
|
- Prepare args:
|
|
|
|
# spl export fdt ${loadaddr} - ${fdt_addr}
|
|
|
|
- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)
|
|
|
|
# mmc write 18000000 0x800 0x800
|
|
|
|
- Restart the board and then SPL binary will launch the kernel directly.
|