Mainline kernel bad magic for Pine64-A64-LTS

[Louis Holbrook]

(Also posted in pine64 forum
https://forum.pine64.org/showthread.php?tid=19460)


In an attempt to troubleshoot failing to get generic alpine linux to
run on PA64-2G-LTS, I've tried to reduce the problem to the smallest
steps that are legible to me. 

When booting the kernel, I get "Bad ARM64 Image Magic" I can't figure
out what this means, and why it is happening. Sources I have searched
seem to be board specific, and found nothing on this board. I've arrived
at a point where I cannot find a way to reason further about it, so thus
I am reaching out.

I am currently loading the kernel and dtb manually at the uboot prompt:

setenv bootargs loglevel=7 earlyprintk
fatload mmc 0:1 0x42000000 boot/vmlinux
fatload mmc 0:1 0x4a000000 boot/u-boot.dtb
booti 0x42000000 - 0x4a000000

My current configuration is:

- linux 5.14 from mainline (git:7d2a07b769330c34b4deabeed939325c77a7ec2f)
- u-boot v2024.10 from https://source.denx.de/u-boot/u-boot
(git:f919c3a889f0ec7d63a48b5d0ed064386b0980bd)
- dtb from the u-boot build
- bl31.bin from PLAT=sun50i_a64
https://git.trustedfirmware.org/TF-A/tru...ware-a.git lts-v2.10.6
(git:f2aebf361050d69176d60016170291efa9e08a68)
- scp.bin from https://github.com/crust-firmware/crust 0.6
(git:ffe9f1ac9c675e6e67db9084bd19fbdeffd8e162)
- u-boot-sunxi-with-spl.bin written to offset 8k
- tried sd and emmc vfat single partition (whole disk) with
	* boot/vmlinux
	* boot/u-boot.dtb

Files:

- uboot defconfig:
https://g33k.holbrook.no/c36cab0e6a15127...7b25f71bdd
- uboot environment (saved from soc):
https://g33k.holbrook.no/1c4d93e6510eb49...2329468b73
- linux defconfig:
https://g33k.holbrook.no/5bde4487e333f5a...19beb3382f