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:
- full support for modified command
today I limit the support for the command used by DISTRO macro:
+ gpt write
+ part list
- 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
test filtering feature (can be used to mask some partitions to linux
according the GUID)
1/ only add MTD for some guid = linux
2/ then add MTD for some guid = data
=> mtdparts delall
=> setenv mtdparts "mtdparts="
=> setenv mtdids "nor0=nor0"
=> mtdparts gpt nor0 linux
=> mtdparts
device nor0 <nor0>, # parts = 1
#: name size offset mask_flags
0: boot 0x00080000 0x00040000 0
active partition: nor0,0 - (boot) 0x00080000 @ 0x00040000
defaults:
mtdids : none
mtdparts: none
=> mtdparts gpt nor0 data
=> 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: nor0,2 - (boot) 0x00080000 @ 0x00040000
defaults:
mtdids : none
mtdparts: none
Changes in v2:
- split serie to reduce patches size
(seperate disk part and cmd impact and add precursor patch)
- split large function
Patrick Delaunay (8):
uuid: add function for GUID string parsing
disk: part: refactor to prepare GPT over MTD
disk: part: add support of GPT partitioning over MTD
cmd: gpt: update command to support GPT over MTD
cmd: part: update command to support GPT over MTD
cmd: mtdparts: update command to support GPT over MTD
uuid: remove dependency with io.h
sandbox: GPT over MTD test
Kconfig | 12 +
cmd/gpt.c | 98 ++++++--
cmd/mtdparts.c | 121 +++++++++-
cmd/part.c | 48 +++-
configs/sandbox_defconfig | 2 +
disk/part_efi.c | 560 +++++++++++++++++++++++++++++++++++++++++-----
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, 1011 insertions(+), 86 deletions(-)
create mode 100644 doc/README.gpt.mtd
--
1.9.1
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