linux-kernel - Re: intel-ixp42x-welltech-epbx100 no longer boot due to 463dbba4d189 ("ARM: 9104/2: Fix Keystone 2 kernel mapping regression")

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Date:   Tue, 28 Sep 2021 12:32:13 +0200
From:   Krzysztof Hałasa <khalasa@...p.pl>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     linusw@...nel.org, kaloz@...nwrt.org, linux@...linux.org.uk,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: intel-ixp42x-welltech-epbx100 no longer boot due to
 463dbba4d189 ("ARM: 9104/2: Fix Keystone 2 kernel mapping regression")

Hello Corentin,

Corentin Labbe <clabbe.montjoie@...il.com> writes:

> I am working on puting my ixp4xx board on kernelCI.
> But it no longer boot since 4.14.
> It only prints "Starting kernelUncompressing Linux... done, booting the kernel." then nothing.
>
> I bisected the break to 463dbba4d189 ("ARM: 9104/2: Fix Keystone 2 kernel mapping regression")

I guess you build your kernel as big-endian.

These parts seem suspicious to me:

-    str r8, [r5]            @ Save physical start of kernel
+#ifdef CONFIG_CPU_ENDIAN_BE8
+    str r8, [r5, #4]            @ Save physical start of kernel (BE)
+#else
+    str r8, [r5]            @ Save physical start of kernel (LE)
+#endif

and

-    str r3, [r5]            @ Save physical end of kernel
+#ifdef CONFIG_CPU_ENDIAN_BE8
+    str r3, [r5, #4]            @ Save physical end of kernel (BE)
+#else
+    str r3, [r5]            @ Save physical end of kernel (LE)
+#endif

IXP4xx, being ARMv5, uses CONFIG_CPU_ENDIAN_BE32 (when configured as
BE), but it needs the ", #4" as well.

I'd test with: #if defined CONFIG_CPU_ENDIAN_BE8 || defined CONFIG_CPU_ENDIAN_BE32
--
Krzysztof "Chris" Hałasa

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