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| author | Tom Rini <trini@konsulko.com> | 2023-04-05 18:59:47 -0400 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2023-04-05 18:59:47 -0400 |
| commit | 487e42f7bc5e685c9337890a38358581bb4f31bc (patch) | |
| tree | 03133e406371e92ce12b03b50c61a82637eea827 /include/efi_loader.h | |
| parent | 25eeda170c5e533ca0e3837c8b2d7404cdd749d1 (diff) | |
| parent | 272ec6b453049beaf0de6654dabf9bbd5f617022 (diff) | |
Merge branch '2023-04-05-blkmap-composable-virtual-block-devices'
To quote the author:
Block maps are a way of looking at various sources of data through the
lens of a regular block device. It lets you treat devices that are not
block devices, like RAM, as if they were. It also lets you export a
slice of an existing block device, which does not have to correspond to
a partition boundary, as a new block device.
This is primarily useful because U-Boot's filesystem drivers only
operate on block devices, so a block map lets you access filesystems
wherever they might be located.
The implementation is loosely modeled on Linux's "Device Mapper"
subsystem, see the kernel documentation [1] for more information.
The primary use-cases are to access filesystem images stored in RAM, and
within FIT images stored on disk. See doc/usage/blkmap.rst for more
details.
The architecture is pluggable, so adding other types of mappings should
be quite easy.
[1]: https://docs.kernel.org/admin-guide/device-mapper/index.html
Diffstat (limited to 'include/efi_loader.h')
| -rw-r--r-- | include/efi_loader.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/efi_loader.h b/include/efi_loader.h index cee04cbb9d..4b89b9816d 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -134,6 +134,10 @@ static inline efi_status_t efi_launch_capsules(void) #define U_BOOT_GUID \ EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \ 0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b) +/* GUID used as root for blkmap devices */ +#define U_BOOT_BLKMAP_DEV_GUID \ + EFI_GUID(0x4cad859d, 0xd644, 0x42ff, \ + 0x87, 0x0b, 0xc0, 0x2e, 0xac, 0x05, 0x58, 0x63) /* GUID used as host device on sandbox */ #define U_BOOT_HOST_DEV_GUID \ EFI_GUID(0xbbe4e671, 0x5773, 0x4ea1, \ |