Add uImage.FIT partition parser and wire it up to allow mounting filesystem sub-images from uImage.FIT in GPT partitions as well as mtdblock and ubiblock devices within Linux (e.g. as root filesystem). Using uImage.FIT to store the root filesystem besides kernel and dtb has several obvious advantages which are hard to obtain in any other way: * single image accross different storage types * dynamically sized partitions for kernel and rootfs * hash also for rootfs checked by U-Boot before launching kernel * images may include additional filesystems e.g. for localization or branding For this to work, the image has to be created with external data and sub-images aligned to the system's memory page boundaries, ie. mkimage -E -B 0x1000 -p 0x1000 ... Booting such images has been supported by U-Boot since v2018.01. A previous version of this partition parser is in production use on some OpenWrt devices, eg. the BananaPi R64 where using the FIT parser allows booting the very same image from eMMC, SD Card or SPI-NAND/UBI and also using it as a firmware-upgrade image at the same time. The Ubiquiti UniFi 6 LR access served as a reference board with SPI-NOR flash and use of the partition parser on top of a mtdblock device. Most recently U-Boot now passes down the selected configuration node name via device tree to allow the partition parser (or userspace process via sysfs) to identify the image configuration. Device Tree schema for that: https://github.com/devicetree-org/dt-schema/commit/a24d97d43491e55d4def006213213a6c4045b646 In most cases this partition parser can be used without relying on the bootloader to pass-down the configuration node name. The default configuration node is used then. Changes since v1: * Use again #ifdef's in partitions/efi to only build against FIT parser symbols if it is actually selected. Otherwise the efi/gpt would unconditionally depend on the FTT parser to be present. Changes since RFC: * fixed wrong variable used in error path * introduced dedicated Kconfig options to enable partition parsers on mtdblock and ubiblock * drop #ifdef'ery, use IS_ENABLED(...) where needed Daniel Golle (5): block: add new flag to add partitions read-only block: add partition parser for U-Boot uImage.FIT partitions/efi: add support for uImage.FIT sub-partitions mtd_blkdevs: add option to enable scanning for partitions mtd: ubi: block: add option to enable scanning for partitions MAINTAINERS | 6 + block/blk.h | 1 + block/partitions/Kconfig | 14 ++ block/partitions/Makefile | 1 + block/partitions/check.h | 5 + block/partitions/core.c | 6 + block/partitions/efi.c | 9 + block/partitions/efi.h | 3 + block/partitions/fit.c | 352 ++++++++++++++++++++++++++++++++++++++ drivers/mtd/Kconfig | 11 ++ drivers/mtd/mtd_blkdevs.c | 4 +- drivers/mtd/ubi/Kconfig | 10 ++ drivers/mtd/ubi/block.c | 5 +- 13 files changed, 425 insertions(+), 2 deletions(-) create mode 100644 block/partitions/fit.c -- 2.36.0
