This series introduces the EFI_RAM_DISK_PROTOCOL implementation. The major purpose of this series is a preparation for EFI HTTP(S) boot.
Now U-Boot can download the distro installer ISO image via wget or tftpboot commands, but U-Boot can not mount the downloaded ISO image. By calling EFI_RAM_DISK_PROTOCOL->register API, user can mount the ISO image and boot the distro installer.
Note that the installation process may not proceed after the distro installer calls ExitBootServices() since there is no hand-off process for the block device of memory mapped ISO image.
The EFI_RAM_DISK_PROTOCOL was tested with the debian network installer[1] on qemu_arm64 platform. The example procedure is as follows. => tftpboot 41000000 mini.iso => efidebug disk mount 41000000 $filesize or => ramdisk mount 41000000 $filesize
ramdisk command works without CONFIG_EFI_LOADER enabled.
After these commands, ISO image is mounted like:
=> efidebug dh
000000007eec63f0 (ramdisk_blk#0) /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/RamDisk(0x41000000,4974afff,3d5abd30-4175-87ce-6d64-d2ade523c4bb,0x0) Block IO
000000007eec6560 (ramdisk_blk#0:1) /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/RamDisk(0x41000000,4974afff,3d5abd30-4175-87ce-6d64-d2ade523c4bb,0x0)/HD(1,0x01,0,0x0,0x33800) Block IO
000000007eec66d0 (ramdisk_blk#0:2) /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/RamDisk(0x41000000,4974afff,3d5abd30-4175-87ce-6d64-d2ade523c4bb,0x0)/HD(2,0x01,0,0x33800,0x10000) Block IO System Partition Simple File System
=> dm tree -s
ramdisk 0 [ + ] ramdisk |-- ramdisk0 blk 0 [ + ] ramdisk_blk | `-- ramdisk_blk#0 partition 0 [ + ] blk_partition | |-- ramdisk_blk#0:1 partition 1 [ + ] blk_partition | `-- ramdisk_blk#0:2
Debian can be successfully installed with this ramdisk on QEMU.
The created ramdisk can be accessed by the existing commands such as 'fatls': => fatls ramdisk 0:2
[TODO] - add ramdisk command documentation - add ramdisk command dm test
[1] https://deb.debian.org/debian/dists/bookworm/main/installer-arm64/current/im...
[Changelog] v1 -> v2 - implement ramdisk uclass and driver, then EFI_RAM_DISK_PROTOCOL is implemented based on the ramdisk uclass
Masahisa Kojima (6): efi_loader: add RAM disk device path ramdisk: add ramdisk uclass and driver cmd: ramdisk: add ramdisk control command efi_loader: add EFI_RAM_DISK_PROTOCOL implementation cmd: efidebug: add RAM disk mount command efi_selftest: add EFI_RAM_DISK_PROTOCOL selftest
cmd/Kconfig | 7 + cmd/Makefile | 1 + cmd/efidebug.c | 118 ++++++ cmd/ramdisk.c | 92 ++++ disk/part.c | 3 + drivers/block/Kconfig | 7 +- drivers/block/Makefile | 2 + drivers/block/blk-uclass.c | 1 + drivers/block/blk_ramdisk.c | 187 +++++++++ drivers/block/ramdisk-uclass.c | 14 + include/dm/uclass-id.h | 1 + include/efi_api.h | 32 ++ include/efi_loader.h | 4 + include/ramdisk.h | 32 ++ lib/efi_loader/Kconfig | 7 + lib/efi_loader/Makefile | 1 + lib/efi_loader/efi_device_path.c | 25 ++ lib/efi_loader/efi_device_path_to_text.c | 14 + lib/efi_loader/efi_ram_disk.c | 142 +++++++ lib/efi_loader/efi_setup.c | 6 + lib/efi_selftest/Makefile | 1 + lib/efi_selftest/efi_selftest_ram_disk.c | 511 +++++++++++++++++++++++ lib/uuid.c | 4 + 23 files changed, 1211 insertions(+), 1 deletion(-) create mode 100644 cmd/ramdisk.c create mode 100644 drivers/block/blk_ramdisk.c create mode 100644 drivers/block/ramdisk-uclass.c create mode 100644 include/ramdisk.h create mode 100644 lib/efi_loader/efi_ram_disk.c create mode 100644 lib/efi_selftest/efi_selftest_ram_disk.c
base-commit: e2e2aea5733f0d23cd9593bbefe5c803c552dcb9