linux-kernel - Re: [PATCH v2] powerpc: Add reloc_offset() to font bitmap pointer used for bootx

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Message-ID: <4c70fe51-56c3-4292-9eda-f0f4535718fe@mac.com>
Date: Sun, 18 Jan 2026 12:41:42 -0600
From: Cedar Maxwell <cedarmaxwell@....com>
To: Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <chleroy@...nel.org>, Finn Thain <fthain@...ux-m68k.org>
Cc: Stan Johnson <userm57@...oo.com>,
 "Dr. David Alan Gilbert" <linux@...blig.org>,
 Benjamin Herrenschmidt <benh@...nel.crashing.org>, stable@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc: Add reloc_offset() to font bitmap pointer
 used for bootx_printf()

Maddy (and everyone else),

Thank you all for your hard work in solving this issue!

Cedar Maxwell

On 12/26/25 10:23 PM, Madhavan Srinivasan wrote:
> On Mon, 10 Nov 2025 10:30:22 +1100, Finn Thain wrote:
>> Since Linux v6.7, booting using BootX on an Old World PowerMac produces
>> an early crash. Stan Johnson writes, "the symptoms are that the screen
>> goes blank and the backlight stays on, and the system freezes (Linux
>> doesn't boot)."
>>
>> Further testing revealed that the failure can be avoided by disabling
>> CONFIG_BOOTX_TEXT. Bisection revealed that the regression was caused by
>> a change to the font bitmap pointer that's used when btext_init() begins
>> painting characters on the display, early in the boot process.
>>
>> [...]
> Applied to powerpc/fixes.
>
> [1/1] powerpc: Add reloc_offset() to font bitmap pointer used for bootx_printf()
>        https://git.kernel.org/powerpc/c/b94b73567561642323617155bf4ee24ef0d258fe
>
> cheers