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bug#19137: mklabel gpt created invalid Protective MBR
From: |
Ulrich Windl |
Subject: |
bug#19137: mklabel gpt created invalid Protective MBR |
Date: |
Fri, 21 Nov 2014 08:50:24 +0100 |
GNU Parted 2.3 creates an invalid Protective MBR (for a 3MB test image):
--
hexdump -C gptgood
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001c0 01 00 ee fe ff ff 01 00 00 00 ff 17 00 00 00 00 |................|
000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
[...]
---
Partition #1 (or is it #4?) decodes as this:
--
Legacy MBR:
MBR Signature = aa55
Unique Signature = 00000000
Partition 1:
Boot Indicator : non-bootable
Starting Cylinder = 0
Starting Head = 1
Starting Sector = 0
System ID = 0xee
Ending Cylinder = 1023
Ending Head = 63
Ending Sector = 254
Relative Sectors = 1
Total Sectors = 6143
--
First, UEFI says the StartingCHS should be set to 0x000200, that should be
0/0/2, not 0/1/0. Second, UEFI says Ending CHS should be set to the CHS address
of the last logical block on the disk, _or_ 0xffffff if it's not possible to
represent the value in the field. For my 3MB image that value is not correct.
- bug#19137: mklabel gpt created invalid Protective MBR,
Ulrich Windl <=