[PATCH] mtdpart: Support MTDPART_SIZ_FULL in fixed-partitions

[Mike Looijmans]

ping?

Maybe I should have added to the description that the Linux kernel 
allows MTD partitions to specify a size "0" in the device-tree to mean 
"the remainder". This patch makes u-boot compatible with the kernel's 
MTD partitions. U-boot MTDPARTS also supported this, but it's missing in 
the device-tree parser.

M.

On 25-03-2025 16:52, Mike Looijmans wrote:
> Flash partitions may specify MTDPART_SIZ_FULL (=0) as the size of the
> partition to indicate "the remainder of the flash". Make this work with
> device-tree "fixed-partitions" as well.
>
> Signed-off-by: Mike Looijmans <mike.looijmans at topic.nl>
> ---
>
>   drivers/mtd/mtdpart.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
> index 88094b81e7a..5284890bd88 100644
> --- a/drivers/mtd/mtdpart.c
> +++ b/drivers/mtd/mtdpart.c
> @@ -910,11 +910,13 @@ int add_mtd_partitions_of(struct mtd_info *master)
>   			continue;
>   
>   		offset = ofnode_get_addr_size_index_notrans(child, 0, &size);
> -		if (offset == FDT_ADDR_T_NONE || !size) {
> -			debug("Missing partition offset/size on \"%s\" partition\n",
> +		if (offset == FDT_ADDR_T_NONE) {
> +			debug("Missing partition offset on \"%s\" partition\n",
>   			      master->name);
>   			continue;
>   		}
> +		if (size == MTDPART_SIZ_FULL)
> +			size = master->size - offset;
>   
>   		part.name = ofnode_read_string(child, "label");
>   		if (!part.name)


-- 
Mike Looijmans
System Expert

TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands

T: +31 (0) 499 33 69 69
E: mike.looijmans at topic.nl
W: www.topic.nl