[PATCH V2 0/3] MdeModulePkg/PartitionDxe: Make the parition driver match the spec

["Gao, Zhichao" <zhichao.gao@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2823
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2843

Refer to the UEFI spec 2.8, Section 13.3.2:
A block device should be scanned as below order:
1. GPT
2. ISO 9660 (El Torito) (UDF should aslo be here)
4. MBR
5. no partition found

But the code implementation is:
1. GPT
2. MBR
3. ISO 9660 (El Torito) (UDF)
4. no partition found

Which would cause the ISO 9960 image with MBR info be treated as MBR
device. That would cause unexpect behavior. So fix it to follow the spec
description.

The fix of the PartitionInstallChildHandle would change the boot behavior
of Linux ISO image with MBR table. So add it after the order adjustment
to make no impact of the boot.

V2:
1. Add description of the different behavior between grub boot from MBR path and
from CD path
2. change patch #2 to revert "MdeModulePkg/PartitionDxe: Skip the MBR that add for CD-ROM"

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Gary Lin <glin@suse.com>
Cc: Andrew Fish <afish@apple.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>

Zhichao Gao (3):
  MdeModulePkg/PartitionDxe: Put the UDF check ahead of MBR
  MdeModulePkg/PartitionDxe: Revert changes for the special MBR
  MdeModulePkg/PartitionDxe: Fix the incorrect LBA size in child hander

 .../Universal/Disk/PartitionDxe/Mbr.c         | 37 +++----------------
 .../Universal/Disk/PartitionDxe/Partition.c   | 22 ++++++-----
 2 files changed, 18 insertions(+), 41 deletions(-)

-- 
2.21.0.windows.1