Custom bootcmd/bootargs for the Motorola Edge 40 Pro (rtwo, SM8550).
The Motorola ABL loads this U-Boot as its "kernel" and always fills
/chosen/linux,initrd-start with the RAM address of whatever it loaded
as "ramdisk" (standard Android/GKI boot protocol). We package a FIT
image (mainline pmOS kernel + dtb + initramfs) as that ramdisk, so
bootcmd reads $prevbl_initrd_start_addr (populated by
CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR from that same DT property)
and does `bootm` on it, with a menu/bootefi fallback if the FIT boot
fails.
Part of the rtwo bring-up: see project notes rtwo-uboot-chainload for
the full mechanism and why this replaced booting the mainline kernel
directly from the Motorola ABL.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015ADQrjdgE8awSA7TSaGgfr
snlavaiseandClaude Sonnet 5
afce23df9a