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dfu: mmc: add support for in-partition offset

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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>
This commit is contained in:
Marek Szyprowski 2019-10-02 12:34:37 +02:00 committed by Marek Vasut
parent 909338c345
commit d2d8eab421
1 changed files with 11 additions and 2 deletions
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13
drivers/dfu/dfu_mmc.c
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@ -352,6 +352,7 @@ int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
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 @@ int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char *s)
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;