Dzmitry Sankouski d5c4ec4aa3 board: axy17lte: get board usable - add bootcmd and docs ... U-boot is intended to replace linux kernel in android boot image(ABL), and it's FIT payload to replace initramfs file. The boot process is similar to boot image with linux: - android bootloader (ABL) unpacks android boot image - ABL sets `linux,initrd-start property` in chosen node in unpacked FDT - ABL sets x0 register to FDT address, and passes control to u-boot - u-boot reads x0 register, and stores it in `prevbl_fdt_addr` env variable - u-boot reads `linux,initrd-start` property, and stores it in `prevbl_initrd_start_addr` In this way, u-boot bootcmd relies on `prevbl_initrd_start_addr` env variable, and boils down to `bootm $prevbl_initrd_start_addr`. If more control on boot process is desired, pack a boot script in FIT image, and put it to default configuration What done: - Rearrange defconfig option order - Add CONFIG_SAVE_PREV_BL_* options - Doc updates: - remove wrong SBOOT memory corruption note, because memory is changed during u-boot bringup process, not by SBOOT - put payload on ramdisk place in abl boot image creation step Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>		2022-04-04 19:02:03 -04:00
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axy17lte.rst	board: axy17lte: get board usable - add bootcmd and docs	2022-04-04 19:02:03 -04:00
index.rst	board: samsung: add support for Galaxy A series of 2017 (a5y17lte)	2021-10-31 11:25:39 -04:00