dfu: mmc: Add support for exposing whole mmc device
Add support for exposing the whole mmc device by setting the 'size'
parameter to 0. This can be useful in case it is not clear what the
total device size is up front. Update the documentation accordingly.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Link: https://lore.kernel.org/r/20231029223740.284149-1-marex@denx.de
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
diff --git a/doc/usage/dfu.rst b/doc/usage/dfu.rst
index 68cacbb..8845a71 100644
--- a/doc/usage/dfu.rst
+++ b/doc/usage/dfu.rst
@@ -121,6 +121,11 @@
with
+ offset
+ is the offset in the device (hexadecimal without "0x")
+ size
+ is the size of the access area (hexadecimal without "0x")
+ or 0 which means whole device
partid
being the GPT or DOS partition index,
num
diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
index cdb3c18..12c54e9 100644
--- a/drivers/dfu/dfu_mmc.c
+++ b/drivers/dfu/dfu_mmc.c
@@ -387,6 +387,16 @@
dfu->data.mmc.lba_blk_size = mmc->read_bl_len;
/*
+ * In case the size is zero (i.e. mmc raw 0x10 0),
+ * assume the user intends to use whole device.
+ */
+ if (third_arg == 0) {
+ struct blk_desc *blk_dev = mmc_get_blk_desc(mmc);
+
+ dfu->data.mmc.lba_size = blk_dev->lba;
+ }
+
+ /*
* Check for an extra entry at dfu_alt_info env variable
* specifying the mmc HW defined partition number
*/