I have a request to support GPT over MTD to be able to have dynamic MTD informations without u-Boot environment(CONFIG_ENV_IS_NOWHERE is a other requirement of my project).
The idea is to use the GPT header to save partitioning information directly in flash device (NOR or NAND), then the MTD variables are rebuild from these GPT partitions and can be used by DISTRO to search bootable binary.
I make a first prototyping for this request but I want ask you if this feature is acceptable for u-boot and if this patches, after some update and cleanups, would be merged in u-boot mainline. Do you see already some blocking points ?
- added code is under a new CONFIG : CONFIG_EFI_PARTITION_MTD - for implementation details, see doc/README.gpt.mtd
TODO: - split patch between core impact (disk/part_efi.c) and command update - full support for modified command (today I limit the support for the command used by DISTRO macro) - DISTRO macro update for automatic boot on GPT bootable partition found in MTD devices
the current level is tested manually on sandbox with :
make O=sandbox sandbox/u-boot -d sandbox/arch/sandbox/dts/test.dtb
=> sf probe SF: Detected M25P16 with page size 256 Bytes, erase size 64 KiB, total 2 MiB
=> setenv nor_part "name=part1,size=64KiB;name=part2,size=128KiB;\ name=boot,type=linux,bootable,size=512KiB" => gpt write nor 0 $nor_part Writing GPT: success!
=> part list nor 0 Part Start LBA End LBA Name Attributes Type GUID Partition GUID 1 0x00000080 0x000000ff "part1" attrs: 0x0000000000000000 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 type: data guid: d117f98e-6f2c-0040-00b2-331a19f91cb2 2 0x00000100 0x000001ff "part2" attrs: 0x0000000000000000 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 type: data guid: 25718777-d0ad-0000-8060-02cb591c9737 3 0x00000200 0x000005ff "boot" attrs: 0x0000000000000004 type: 0fc63daf-8483-4772-8e79-3d69d8477de4 type: linux guid: 8a4bb8b4-e304-0040-0036-aff5c9c495b1
=> setenv mtdids "nor0=nor0" => setenv mtdparts "mtdparts=" => mtdparts gpt nor0 => mtdparts device nor0 <nor0>, # parts = 3 #: name size offset mask_flags 0: part1 0x00010000 0x00010000 0 1: part2 0x00020000 0x00020000 0 2: boot 0x00080000 0x00040000 0
active partition: nor0,0 - (part1) 0x00010000 @ 0x00010000
defaults: mtdids : none mtdparts: none
=> part list nor 0 -bootable nor_boot_part => printenv nor_boot_part nor_boot_part=3
Patrick Delaunay (3): add support of GPT partitioning over MTD uuid: remove dependency with io.h sandbox: GPT over MTD test
Kconfig | 12 ++ cmd/gpt.c | 98 +++++++-- cmd/mtdparts.c | 103 ++++++++- cmd/part.c | 48 ++++- configs/sandbox_defconfig | 2 + disk/part_efi.c | 526 +++++++++++++++++++++++++++++++++++++++++----- doc/README.gpt.mtd | 189 +++++++++++++++++ include/configs/sandbox.h | 7 + include/part.h | 13 +- include/uuid.h | 1 + lib/uuid.c | 46 +++- 11 files changed, 959 insertions(+), 86 deletions(-) create mode 100644 doc/README.gpt.mtd