Re: [PATCH v6 0/5] Initial Support for Linksys EA9350 V3 (linksys-jamaica)

[Arnd Bergmann]

On Mon, Oct 7, 2024, at 20:23, Linus Walleij wrote:
> On Mon, Oct 7, 2024 at 6:35 PM Karl Chan <exxxxkc@xxxxxxxxxxxxxxx> wrote:
>
> Starting kernel ...
>
> undefined instruction
> pc : [<41208004>]          lr : [<4a921f8f>]
> reloc pc : [<41208004>]    lr : [<4a921f8f>]
> sp : 4a822838  ip : 00000001     fp : 00000000
> r10: 4a83b914  r9 : 4a822ea0     r8 : 00000000
> r7 : 00000000  r6 : 41208000     r5 : 4a97d848  r4 : 00000000
> r3 : 644d5241  r2 : 4a0ae000     r1 : 08040001  r0 : 00000000
> Flags: nzCV  IRQs off  FIQs off  Mode SVC_32
> Resetting CPU ...
>
> resetting ...
>
> So perhaps someone knows how we can get around this.
>
> It seems to me the U-Boot is in 32bit mode and tries to just
> execute an Aarch64 binary and that doesn't work.
>
> What we need is a 32bit mode preamble that can switch
> the machine to Aarch64 and continue.

I found this older patch for u-boot about a similar problem
on sunxi machines:

https://patchwork.ozlabs.org/project/uboot/patch/1480902750-839-12-git-send-email-andre.przywara@xxxxxxx/#1528602

Karl, do you have the u-boot sources for this board? I found
a source tarball for kernel (both in 32-bit and 64-bit
mode) and userland on this machines at

https://support.linksys.com/kb/article/316-en/

but the u-boot sources in there don't seem to match the binary
(they are only used to build the u-boot tools, but not the
actual loader). Is this the same base you are working from,
or do you have something else beyond that?

      Arnd