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How to use and build U-Boot on mx6sabresd:
----------------------------------
Currently there are three methods for booting mx6sabresd boards:
1. Booting via Normal U-Boot (u-boot.imx)
2. Booting via SPL (SPL and u-boot.img)
3. Booting via Falcon mode (SPL launches the kernel directly)
1. Booting via Normal U-Boot
----------------------------
$ make mx6qsabresd_defconfig (If you want to build for mx6qsabresd)
or
$ make mx6dlsabresd_defconfig (If you want to build for mx6dlsabresd)
$ make
This will generate the image called u-boot.imx.
- Flash the u-boot.imx binary into the SD card:
$ sudo dd if=u-boot.imx of=/dev/sdb bs=1K seek=1 && sync
2. Booting via SPL
------------------
Other method for building U-Boot on mx6qsabresd and mx6qpsabresd is
through SPL. In order to do so:
$ make mx6sabresd_spl_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/sdbbs=1K seek=69 && sync
3. Booting via Falcon mode
--------------------------
$ make mx6sabresd_spl_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 oflag=sync status=none && sync
- Flash the u-boot.img image into the SD card:
$ sudo dd if=u-boot.img of=/dev/sdbbs=1K seek=69 oflag=sync status=none && sync
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:
- Setup the IP server:
# setenv serverip <server_ip_address>
- Download dtb file:
# dhcp ${fdt_addr} imx6q-sabresd.dtb
- Download kernel image:
# dhcp ${loadaddr} uImage
- Write kernel at 2MB offset:
# mmc write ${loadaddr} 0x1000 0x4000
- Setup kernel bootargs:
# setenv bootargs "console=ttymxc0,115200 root=/dev/mmcblk1p1 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
- Press KEY_VOL_UP key, power up the board and then SPL binary will
launch the kernel directly.
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