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29 July 2024, 15:18:00 UTC
Revision 6b02fa59a7cf34c548eedee657b07ea6c54d3894 authored by Davidlohr Bueso on 13 September 2013, 22:02:22 UTC, committed by Linus Torvalds on 15 September 2013, 11:10:16 UTC 
partitions/efi: loosen check fot pmbr size in lba
 
Matt found that commit 27a7c642174e ("partitions/efi: account for pmbr
size in lba") caused his GPT formatted eMMC device not to boot.  The
reason is that this commit enforced Linux to always check the lesser of
the whole disk or 2Tib for the pMBR size in LBA.  While most disk
partitioning tools out there create a pMBR with these characteristics,
Microsoft does not, as it always sets the entry to the maximum 32-bit
limitation - even though a drive may be smaller than that[1].

Loosen this check and only verify that the size is either the whole disk
or 0xFFFFFFFF.  No tool in its right mind would set it to any value
other than these.

[1] http://thestarman.pcministry.com/asm/mbr/GPT.htm#GPTPT

Reported-and-tested-by: Matt Porter <matt.porter@linaro.org>
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 3711d86
History
Tip revision: 6b02fa59a7cf34c548eedee657b07ea6c54d3894 authored by Davidlohr Bueso on 13 September 2013, 22:02:22 UTC
partitions/efi: loosen check fot pmbr size in lba
Tip revision: 6b02fa5
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