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

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Message-Id: <ad82005d-729d-4165-afa5-61ca82382bc5@app.fastmail.com>
Date: Mon, 07 Oct 2024 22:00:04 +0000
From: "Arnd Bergmann" <arnd@...db.de>
To: "Linus Walleij" <linus.walleij@...aro.org>,
 "Karl Chan" <exxxxkc@...googleoff.me>,
 "Catalin Marinas" <catalin.marinas@....com>, "Will Deacon" <will@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, "Bjorn Andersson" <andersson@...nel.org>,
 "Konrad Dybcio" <konradybcio@...nel.org>, "Rob Herring" <robh@...nel.org>,
 krzk+dt@...nel.org, "Conor Dooley" <conor+dt@...nel.org>,
 "Michael Turquette" <mturquette@...libre.com>,
 "Stephen Boyd" <sboyd@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
 "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v6 0/5] Initial Support for Linksys EA9350 V3 (linksys-jamaica)

On Mon, Oct 7, 2024, at 20:23, Linus Walleij wrote:
> On Mon, Oct 7, 2024 at 6:35 PM Karl Chan <exxxxkc@...googleoff.me> 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@arm.com/#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