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.w...@intel.com> Cc: Hao A Wu <hao.a...@intel.com> Cc: Ray Ni <ray...@intel.com> Cc: Gary Lin <g...@suse.com> Cc: Andrew Fish <af...@apple.com> Signed-off-by: Zhichao Gao <zhichao....@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 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#64023): https://edk2.groups.io/g/devel/message/64023 Mute This Topic: https://groups.io/mt/76139477/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
