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nios2: Only use built-in devicetree blob if configured to do so 

Starting with commit 7b937cc243 ("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: 7b937cc243 ("of: Create of_root if no dtb provided by firmware")
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20240322065419.162416-1-linux@roeck-us.net
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Guenter Roeck 2024-03-21 23:54:19 -07:00 committed by Rob Herring
parent 500b42091c
commit de164a7f19
1 changed files with 5 additions and 1 deletions
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6
arch/nios2/kernel/prom.c
View File

@ -21,7 +21,8 @@
void __init early_init_devtree(void *params)
{
__be32 *dtb = (u32 *)__dtb_start;
__be32 __maybe_unused *dtb = (u32 *)__dtb_start;
#if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR)
if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) ==
OF_DT_HEADER) {
@ -30,8 +31,11 @@ void __init early_init_devtree(void *params)
return;
}
#endif
#ifdef CONFIG_NIOS2_DTB_SOURCE_BOOL
if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER)
params = (void *)__dtb_start;
#endif
early_init_dt_scan(params);
}