On Thu, Sep 22, 2022 at 09:27:23AM +0200, Johannes Zink wrote:
> On some boards, some partitions exposed to fastboot may become
> unavailable under certain circumstances, e.g. if an SD-Card exposed to
> fastboot is removed.
>
> Previously, this lead to an error and the fastboot gadget did not
> initialize the remaining partitions exposed via fastboot, e.g. an
> eMMC which usually is permanently soldered on the board.
>
> This patch allows to append an optional flag 'o' to the description of a
> fastboot partition. If this partition is unavailable at the
> initialization of the fastboot gadget, said partition is skipped, while
> the remaining available partitions are still exposed.
>
> Signed-off-by: Johannes Zink <j.zink@xxxxxxxxxxxxxx>
> ---
> Documentation/user/usb.rst | 1 +
> common/fastboot.c | 6 +++++-
> common/file-list.c | 3 +++
> include/file-list.h | 1 +
> 4 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/user/usb.rst b/Documentation/user/usb.rst
> index 2479efe9d6..f2f57ead98 100644
> --- a/Documentation/user/usb.rst
> +++ b/Documentation/user/usb.rst
> @@ -65,6 +65,7 @@ Several **flags** are supported, each denoted by a single character:
> * ``r`` Readback. The partition is allowed to be read back (DFU specific)
> * ``c`` The file shall be created if it doesn't exist. Needed when a regular file is exported.
> * ``u`` The partition is a MTD device and shall be flashed with a UBI image.
> +* ``o`` The partition is optional, i.e. if it is not available at initialization time, it is skipped instead of aborting the initialization
>
> Example:
>
> diff --git a/common/fastboot.c b/common/fastboot.c
> index 330a06f5a3..6bd1191325 100644
> --- a/common/fastboot.c
> +++ b/common/fastboot.c
> @@ -177,7 +177,11 @@ int fastboot_generic_init(struct fastboot *fb, bool export_bbu)
> file_list_for_each_entry(fb->files, fentry) {
> ret = fastboot_add_partition_variables(fb, fentry);
> if (ret)
> - return ret;
> + if((fentry->flags & FILE_LIST_FLAG_OPTIONAL))
> + pr_info("failed to add optional partition %s to fastboot gadget\n",
> + fentry->filename);
> + else
> + return ret;
I would prefer to check the FILE_LIST_FLAG_OPTIONAL flag in
fastboot_add_partition_variables(). That gives us the possibility to
explicitly check for the right conditions rather than generalising
all possible errors from fastboot_add_partition_variables().
Sascha
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
