dfu: mmc: add support for in-partition offset
Add possibility to define a part of partition as a separate DFU entity.
This allows to have more than one items on the given partition.
The real use case for this option is TM2 board. It can use u-boot stored
as Linux kernel on the defined partition (as RAW data) and load the real
kernel from the same partition, but stored under the certain offset.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Lukasz Majewski <lukma@denx.de>
diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
index 403fd53..5b551f6 100644
--- a/drivers/dfu/dfu_mmc.c
+++ b/drivers/dfu/dfu_mmc.c
@@ -352,6 +352,7 @@
struct blk_desc *blk_dev = mmc_get_blk_desc(mmc);
int mmcdev = second_arg;
int mmcpart = third_arg;
+ int offset = 0;
if (part_get_info(blk_dev, mmcpart, &partinfo) != 0) {
pr_err("Couldn't find part #%d on mmc device #%d\n",
@@ -359,9 +360,17 @@
return -ENODEV;
}
+ /*
+ * Check for an extra entry at dfu_alt_info env variable
+ * specifying the mmc HW defined partition number
+ */
+ if (s)
+ if (!strcmp(strsep(&s, " "), "offset"))
+ offset = simple_strtoul(s, NULL, 0);
+
dfu->layout = DFU_RAW_ADDR;
- dfu->data.mmc.lba_start = partinfo.start;
- dfu->data.mmc.lba_size = partinfo.size;
+ dfu->data.mmc.lba_start = partinfo.start + offset;
+ dfu->data.mmc.lba_size = partinfo.size-offset;
dfu->data.mmc.lba_blk_size = partinfo.blksz;
} else if (!strcmp(entity_type, "fat")) {
dfu->layout = DFU_FS_FAT;