To quote the author:
At present on Sandbox when binding to a host backing file, the host
block device is created with a hard-coded 512 bytes block size.
Such assumption works for most cases, but for situation that with a raw
image file dump from a pre-formatted GPT partitioned disk image from a
4KiB block size device, when binding this file to a host device and mapping
this device to a blkmap, "blkmap" command like "blkmap part" won't work
correctly, due to block size mismatch during parsing the partition table.
This series updates Sandbox block driver, as well as the blkmap driver,
to get rid of the hard-coded 512 bytes block size assumption.
This series is available at u-boot-x86/blk for testing.
Test log (512 block size):
=> host bind 0 test.img
=> host info
dev blocks blksz label path
0 262144 512 0 test.img
=> blkmap create 0
Created "0"
=> blkmap map 0 0 40000 linear host 0 0
Block 0x0+0x40000 mapped to block 0x0 of "host 0"
=> blkmap info
Device 0: Vendor: U-Boot Rev: 1.0 Prod: blkmap
Type: Hard Disk
Capacity: 128.0 MB = 0.1 GB (262144 x 512)
=> blkmap part
Partition Map for BLKMAP device 0 -- Partition Type: EFI
Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
1 0x00000022 0x000000bd "u-boot-spl"
attrs: 0x0000000000000000
type:
5b193300-fc78-40cd-8002-
e86c45580b47
(
5b193300-fc78-40cd-8002-
e86c45580b47)
guid:
0bb6bb6e-4aac-4c27-be03-
016b01e7b941
2 0x00000822 0x00000c84 "u-boot"
attrs: 0x0000000000000000
type:
2e54b353-1271-4842-806f-
e436d6af6985
(
2e54b353-1271-4842-806f-
e436d6af6985)
guid:
91d50814-8e31-4cc0-97dc-
779e1dc59056
3 0x00000c85 0x0000cc84 "rootfs"
attrs: 0x0000000000000004
type:
0fc63daf-8483-4772-8e79-
3d69d8477de4
(linux)
guid:
42799722-6e55-46e6-afa9-
529e7af3f03b
Test log (4096 block size):
=> host bind 0 test.img 4096
=> host info
dev blocks blksz label path
0 32768 4096 0 test.img
=> blkmap create 0
Created "0"
=> blkmap map 0 0 8000 linear host 0 0
Block 0x0+0x8000 mapped to block 0x0 of "host 0"
=> blkmap info
Device 0: Vendor: U-Boot Rev: 1.0 Prod: blkmap
Type: Hard Disk
Capacity: 128.0 MB = 0.1 GB (32768 x 4096)
=> blkmap part
Partition Map for BLKMAP device 0 -- Partition Type: EFI
Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
1 0x00000100 0x00001fff "primary"
attrs: 0x0000000000000000
type:
0fc63daf-8483-4772-8e79-
3d69d8477de4
(linux)
guid:
eba904d7-72c1-4dbd-bb4e-
36be49cba5e3
2 0x00002000 0x00007ffa "primary"
attrs: 0x0000000000000000
type:
0fc63daf-8483-4772-8e79-
3d69d8477de4
(linux)
guid:
c48c360e-db47-46da-ab87-
26416fad3cd3