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![]() 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 | ||
mx6sabresd.c | ||
README |
How to use and build U-Boot on mx6sabresd ----------------------------------------- The following methods can be used for booting mx6sabresd boards: 1. Booting from SD card 2. Booting from eMMC 3. Booting via Falcon mode (SPL launches the kernel directly) 1. Booting from SD card via SPL ------------------------------- mx6sabresd_defconfig target supports mx6q/mx6dl/mx6qp sabresd variants. In order to build it: $ make mx6sabresd_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 2. Booting from eMMC -------------------- $ make mx6sabresd_defconfig $ make This will generate the SPL and u-boot-dtb.img binaries. - Boot first from SD card as shown in the previous section In U-boot change the eMMC partition config: => mmc partconf 2 1 0 0 Mount the eMMC in the host PC: => ums 0 mmc 2 - Flash SPL and u-boot-dtb.img binaries into the eMMC: $ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 && sync $ sudo dd if=u-boot-dtb.img of=/dev/sdX bs=1K seek=69 && sync Set SW6 to eMMC 8-bit boot: 11010110 3. Booting via Falcon mode -------------------------- $ make mx6sabresd_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/sdX bs=1K seek=1 oflag=sync status=none && sync - Flash the u-boot-dtb.img image into the SD card: $ sudo dd if=u-boot-dtb.img of=/dev/sdX bs=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.