linux-kernel - Re: [PATCH v2] nios2: Only use built-in devicetree blob if configured to do so

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Message-ID: <171217296117.18436.10335458241355667114.robh@kernel.org>
Date: Wed, 3 Apr 2024 14:36:36 -0500
From: Rob Herring <robh@...nel.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Frank Rowand <frowand.list@...il.com>, Stephen Boyd <sboyd@...nel.org>,
	linux-kernel@...r.kernel.org, Dinh Nguyen <dinguyen@...nel.org>
Subject: Re: [PATCH v2] nios2: Only use built-in devicetree blob if
 configured to do so


On Thu, 21 Mar 2024 23:54:19 -0700, Guenter Roeck wrote:
> Starting with commit 7b937cc243e5 ("of: Create of_root if no dtb provided
> by firmware"), attempts to boot nios2 images with an external devicetree
> blob result in a crash.
> 
> Kernel panic - not syncing: early_init_dt_alloc_memory_arch:
> 	Failed to allocate 72 bytes align=0x40
> 
> For nios2, a built-in devicetree blob always overrides devicetree blobs
> provided by ROMMON/BIOS. This includes the new dummy devicetree blob.
> Result is that the dummy devicetree blob is used even if an external
> devicetree blob is provided. Since the dummy devicetree blob does not
> include any memory information, memory allocations fail, resulting in
> the crash.
> 
> To fix the problem, only use the built-in devicetree blob if
> CONFIG_NIOS2_DTB_SOURCE_BOOL is enabled.
> 
> Fixes: 7b937cc243e5 ("of: Create of_root if no dtb provided by firmware")
> Cc: Frank Rowand <frowand.list@...il.com>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Cc: Rob Herring <robh@...nel.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v2: Mark 'dtb' as __maybe_unused
> 
>  arch/nios2/kernel/prom.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 

As Dinh has not yet picked this up, I applied it, thanks!