5 Apr
2022
5 Apr
'22
8 p.m.
On Tue, Feb 22, 2022 at 09:49:52PM +0300, Dzmitry Sankouski wrote:
When u-boot is used as a chain-loaded bootloader (replacing OS kernel), previous bootloader leaves data in RAM, that can be reused.
For example, on recent arm linux system, when chainloading u-boot, there are initramfs and fdt in RAM prepared for OS booting. Initramfs may be modified to store u-boot's payload, thus providing the ability to use chainloaded u-boot to boot OS without any storage support.
Two config options added:
- SAVE_PREV_BL_INITRAMFS_START_ADDR saves initramfs start address to 'prevbl_initrd_start_addr' environment variable
- SAVE_PREV_BL_FDT_ADDR saves fdt address to 'prevbl_fdt_addr' environment variable
Signed-off-by: Dzmitry Sankouski dsankouski@gmail.com Cc: Tom Rini trini@konsulko.com
Applied to u-boot/master, thanks!
--
Tom