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https://github.com/brain-hackers/u-boot-brain
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b75d8dc564
The Linux coding style guide (Documentation/process/coding-style.rst) clearly says: It's a **mistake** to use typedef for structures and pointers. Besides, using typedef for structures is annoying when you try to make headers self-contained. Let's say you have the following function declaration in a header: void foo(bd_t *bd); This is not self-contained since bd_t is not defined. To tell the compiler what 'bd_t' is, you need to include <asm/u-boot.h> #include <asm/u-boot.h> void foo(bd_t *bd); Then, the include direcective pulls in more bloat needlessly. If you use 'struct bd_info' instead, it is enough to put a forward declaration as follows: struct bd_info; void foo(struct bd_info *bd); Right, typedef'ing bd_t is a mistake. I used coccinelle to generate this commit. The semantic patch that makes this change is as follows: <smpl> @@ typedef bd_t; @@ -bd_t +struct bd_info </smpl> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> |
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| .. | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| mx6sabreauto.c | ||
| README | ||
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-dtb.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-dtb.img binary into the SD card:
$ sudo dd if=u-boot-dtb.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-dtb.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-dtb.img image into the SD card:
$ sudo dd if=u-boot-dtb.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.