mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-29 16:10:58 +00:00
46580f2fd5
With there now being four device tree files, and 4 separate defconfig files, the code necessary to determine which board is being used is no longer necessary as the corresponding pin-muxing and board names are determined by the device tree. Signed-off-by: Adam Ford <aford173@gmail.com>
56 lines
2.1 KiB
Text
56 lines
2.1 KiB
Text
Summary
|
|
=======
|
|
|
|
The source for omap3logic.c encompases the OMAP35 and DM3730 SOM-LV and DM3730 Torpedo platforms, but there are device trees custom taylored to each board.
|
|
|
|
omap3_logic_defconfig = DM37 Torpedo / Torpedo + Wireless
|
|
omap35_logic_defconfig = OMAP35 Torpedo
|
|
omap3_logic_somlv_defconfig = DM37 SOM-LV
|
|
omap35_logic_somlv_defconfig = OMAP35 SOM-LV
|
|
|
|
The device tree included with each of the defconfig files will also direct the board as to which dtb file to load when loading the kernel, so it is not
|
|
recomended to mix and match the defconfig files.
|
|
|
|
Falcon Mode: FAT SD cards
|
|
=========================
|
|
|
|
In this case the additional file is written to the filesystem. In this
|
|
example we assume that the uImage and device tree to be used are already on
|
|
the FAT filesystem (only the uImage MUST be for this to function
|
|
afterwards) along with a Falcon Mode aware MLO and the FAT partition has
|
|
already been created and marked bootable:
|
|
|
|
U-Boot # mmc rescan
|
|
# Load kernel and device tree into memory, perform export
|
|
U-Boot # fatload mmc 0 ${loadaddr} uImage
|
|
U-Boot # run loadfdt
|
|
U-Boot # setenv optargs quiet
|
|
U-Boot # run mmcargs
|
|
U-Boot # run common_bootargs
|
|
U-Boot # spl export fdt ${loadaddr} - ${fdtaddr}
|
|
|
|
This will print a number of lines and then end with something like:
|
|
Loading Device Tree to 8dec9000, end 8dee0295 ... OK
|
|
|
|
So then note the starting address and write the args to mmc/sd:
|
|
|
|
U-Boot # fatwrite mmc 0:1 0x8dec9000 args 0x20000
|
|
|
|
The size of 0x20000 matches the CMD_SPL_WRITE_SIZE.
|
|
|
|
Falcon Mode: NAND
|
|
=================
|
|
|
|
In this case the additional data is written to another partition of the
|
|
NAND. In this example we assume that the uImage and device tree to be are
|
|
already located on the NAND somewhere (such as filesystem or mtd partition)
|
|
along with a Falcon Mode aware MLO written to the correct locations for
|
|
booting and mtdparts have been configured correctly for the board:
|
|
|
|
U-Boot # nand read ${loadaddr} kernel
|
|
U-Boot # load nand rootfs ${fdtaddr} /boot/am335x-evm.dtb
|
|
U-Boot # run nandargs
|
|
U-Boot # run common_bootargs
|
|
U-Boot # spl export fdt ${loadaddr} - ${fdtaddr}
|
|
U-Boot # nand erase.part u-boot-spl-os
|
|
U-Boot # nand write ${fdtaddr} u-boot-spl-os
|