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boot: extlinux: Fix unaligned buffer for reading data from file system

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extlinux_read_bootflow() allocates a buffer to read from file system
without any alignment.

But for some block devices which transfer data via DMA, ARCH_DMA_MINALIGN
alignment is required. For example, due to misaligned buffer, the below
boot failure is observed.

=> boot
CACHE: Misaligned operation at range [9efa25f8, 9efa27f8]
CACHE: Misaligned operation at range [9efa25f8, 9efa27f8]
CACHE: Misaligned operation at range [9efa25f8, 9efa27f8]
CACHE: Misaligned operation at range [9efa25f8, 9efa27f8]
** Booting bootflow 'mmc@2194000.bootdev.part_1' with extlinux
Ignoring unknown command: �D���D��
Boot failed (err=-14)

Change the buffer alignment to ARCH_DMA_MINALIGN.

Fixes: 31aefaf89a ("bootstd: Add an implementation of distro boot")
Signed-off-by: Nam Cao <namcao@linutronix.de>
Tested-by: Javier Fernandez Pastrana <javier.pastrana@linutronix.de>
This commit is contained in:
Nam Cao 2024-11-07 16:01:05 +01:00 • committed by Tom Rini
parent a38390284a
commit 5efd63c93c
1 changed files with 2 additions and 1 deletions
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3
boot/bootmeth_extlinux.c
View file

@ -8,6 +8,7 @@
#define LOG_CATEGORY UCLASS_BOOTSTD
#include <asm/cache.h>
#include <bootdev.h>
#include <bootflow.h>
#include <bootmeth.h>
@ -159,7 +160,7 @@ static int extlinux_read_bootflow(struct udevice *dev, struct bootflow *bflow)
return log_msg_ret("try", ret);
size = bflow->size;
ret = bootmeth_alloc_file(bflow, 0x10000, 1);
ret = bootmeth_alloc_file(bflow, 0x10000, ARCH_DMA_MINALIGN);
if (ret)
return log_msg_ret("read", ret);