Hi, We observed the following sporadic boot failure while booting from MMC device:
=> 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) The reason is because while allocating buffer to read a file from MMC, alignment of 1 byte is used. Thus, the buffer doesn't work for performing DMA, and garbage data is read. While looking at this issue, I also noticed that if no alignment specified (align=0) then fs_read_alloc() is documented to use the default. But the default is no alignment. Therefore, other users of fs_read_alloc() which specify align=0 may be broken as well. The first patch changes extlinux_read_bootflow() to use proper buffer alignment for DMA. The second patch changes the default alignment of fs_read_alloc() to be DMA-suitable, to fix other potential bugs. Nam Cao (2): boot: extlinux: Fix unaligned buffer for reading data from file system fs: Use ARCH_DMA_MINALIGN as default alignment for fs_read_alloc() boot/bootmeth_extlinux.c | 3 ++- fs/fs.c | 4 ++++ include/fs.h | 2 +- 3 files changed, 7 insertions(+), 2 deletions(-) -- 2.39.5
