On Tue, Feb 22, 2022 at 09:49:54PM +0300, Dzmitry Sankouski wrote: > 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 <dsankou...@gmail.com>
Applied to u-boot/master, thanks! -- Tom
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