[PATCH RFT v3 0/3] fastboot: add support for generic block flashing

[Mattijs Korpershoek]

Hi Neil,

Thank you for the series.

On mar., mai 06, 2025 at 18:10, neil.armstrong at linaro.org wrote:

> 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.

I've tested the series on khadas-vim3_android_defconfig
keeping CONFIG_FASTBOOT_FLASH_MMC=y (so with the emmc backend)

I tested the following:
# flashing a raw partition with a descriptor:
$ fastboot flash bootloader u-boot_kvim3_noab.bin
# flashing a sparse image:
$ fastboot flash super super.img

I also testing reflashing the super.img when using the generic block
layer:
=> fastboot usb 0
Warning: the fastboot block backend features are limited, consider using the MMC backend

$ fastboot flash super super.img

Both work great!

Tested-by: Mattijs Korpershoek <mkorpershoek at kernel.org>

I've also opened a issue on gitlab to harmonize the fastboot emmc
backend with the generic block backend:
https://source.denx.de/u-boot/custodians/u-boot-dfu/-/issues/6

>
> Signed-off-by: Neil Armstrong <neil.armstrong at 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      |  28 +++-
>  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, 502 insertions(+), 206 deletions(-)
> ---
> base-commit: 4d3b5c679bc9d5c6cbbeedcc1e4a186f1cc35541
> change-id: 20250408-topic-fastboot-blk-c5e14cd59224
>
> Best regards,
> -- 
> Neil Armstrong <neil.armstrong at linaro.org>