[PATCH RFT v6 0/3] fastboot: add support for generic block flashing

[Neil Armstrong]

This serie permits using any block device as target
for fastboot by moving the generic block logic into
a common set of helpers and also use them as generic
backend.

The erase logic has been extended to support software
erase since only 2 block drivers exposes the erase
operation.

Tests are welcome to make sure this series doesn't
introduce any regressions on the emmc backend.

Before and after patchset:
$ tools/qconfig.py -f FASTBOOT ARCH_SUNXI BLK ~FASTBOOT_FLASH
 1 matches
 CHIP

The CHIP board disables MMC and had FASTBOOT_BLK disabled to
save memory, but adding the BLK dependency made FASTBOOT_FLASH_BLOCK
enabled on boards that didn't want FASTBOOT_FLASH enabled at all.

Signed-off-by: Neil Armstrong <neil.armstrong at linaro.org>
---
Changes in v6:
- Fix BLK dependency that can affect SUNXI board with MMC/NAND disabled
- Link to v5: https://lore.kernel.org/r/20250606-topic-fastboot-blk-v5-0-203538ec5b32@linaro.org

Changes in v5:
- Removed BLK dependency on FASTBOOT_FLASH_MMC
- Removed BLK dependency on FASTBOOT_FLASH in patch 2
- Added back BLK dependency on FASTBOOT_FLASH in patch 3
- Rewrote FASTBOOT_FLASH_BLOCK_INTERFACE_ID help text with Tom suggestions
- Removed default for FASTBOOT_FLASH_BLOCK_INTERFACE_NAME
- CI test run is fixed with FASTBOOT_FLASH_BLOCK_INTERFACE_ID default to 0
- Link to v4: https://lore.kernel.org/r/20250522-topic-fastboot-blk-v4-0-af7f7f30564d@linaro.org

Changes in v4:
- Rebase on next
- Fixup Kconfig default values & description
- Link to v3: https://lore.kernel.org/r/20250506-topic-fastboot-blk-v3-0-d94be5829f46@linaro.org

Changes in v3:
- Move Kconfig/Makefile changes over the 2 patches
- Relicence to GPL2 with Dmitrii approval
- Move soft erase in a separate function
- Update help text of Kconfig BLOCK entries
- Add warning at init if MMC was selected with BLOCK backend
- Link to v2: https://lore.kernel.org/r/20250409-topic-fastboot-blk-v2-0-c676f21d414f@linaro.org

Changes in v2:
- Dropped applied virtio erase patch
- Reorganize patches, introducing helpers first, using them in mmc afterwards
- Added soft-erase logic
- Added move helpers to handle the partitions erase & flash from emmc
- Fixed const var on last patch
- Link to v1: https://lore.kernel.org/all/20240306185921.1854109-1-dimorinny@google.com/

---
Dmitrii Merkurev (3):
      fastboot: blk: introduce fastboot block flashing support
      fastboot: blk: switch emmc to use the block helpers
      fastboot: integrate block flashing back-end

 drivers/fastboot/Kconfig      |  32 ++++-
 drivers/fastboot/Makefile     |   4 +-
 drivers/fastboot/fb_block.c   | 323 ++++++++++++++++++++++++++++++++++++++++++
 drivers/fastboot/fb_command.c |   8 ++
 drivers/fastboot/fb_common.c  |  22 ++-
 drivers/fastboot/fb_getvar.c  |   8 +-
 drivers/fastboot/fb_mmc.c     | 210 ++-------------------------
 include/fb_block.h            | 105 ++++++++++++++
 8 files changed, 506 insertions(+), 206 deletions(-)
---
base-commit: f2220962f9cb1366bfc003ec2cc5650499c68895
change-id: 20250408-topic-fastboot-blk-c5e14cd59224

Best regards,
-- 
Neil Armstrong <neil.armstrong at linaro.org>