[PATCH] mtd: physmap-core: Prioritize ofparts for OF probe

[PATCH] mtd: physmap-core: Prioritize ofparts for OF probe

[Linus Walleij]

Place the ofparts before RedBoot partitions in the OF probe
path: this makes it possible to override any existing
RedBoot partitions with fixed-partitions which may be necessary,
such as when you need to repartition the flash from Linux'
point of view but not necessary from the bootloaders point
of view.

This happens when a device such as Raidsonic IB-4220-B has
three partitions named "Kern", "Ramdisk" and "Application"
that we want to merge into one for more efficient use
of the flash memory in OpenWrt.

Signed-off-by: Linus Walleij <linusw@kernel.org>
---
 drivers/mtd/maps/physmap-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/maps/physmap-core.c b/drivers/mtd/maps/physmap-core.c
index 2bd7a1af898c..0dcc25b7ff98 100644
--- a/drivers/mtd/maps/physmap-core.c
+++ b/drivers/mtd/maps/physmap-core.c
@@ -268,7 +268,7 @@ static const struct of_device_id of_flash_match[] = {
 MODULE_DEVICE_TABLE(of, of_flash_match);
 
 static const char * const of_default_part_probes[] = {
-	"cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL
+	"cmdlinepart", "ofpart", "ofoldpart", "RedBoot", NULL
 };
 
 static const char * const *of_get_part_probes(struct platform_device *dev)

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20260129-gemini-mtd-of-partition-parse-order-a33efcf3422d

Best regards,
-- 
Linus Walleij <linusw@kernel.org>


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Re: [PATCH] mtd: physmap-core: Prioritize ofparts for OF probe

[Miquel Raynal]

> This happens when a device such as Raidsonic IB-4220-B has
> three partitions named "Kern", "Ramdisk" and "Application"
> that we want to merge into one for more efficient use
> of the flash memory in OpenWrt.

If by "more efficient" you mean "split into UBI volumes rather than MTD
partitions", I'm all for it ;-)

Miquèl

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Re: [PATCH] mtd: physmap-core: Prioritize ofparts for OF probe

[Miquel Raynal]

On Thu, 29 Jan 2026 00:55:09 +0100, Linus Walleij wrote:
> Place the ofparts before RedBoot partitions in the OF probe
> path: this makes it possible to override any existing
> RedBoot partitions with fixed-partitions which may be necessary,
> such as when you need to repartition the flash from Linux'
> point of view but not necessary from the bootloaders point
> of view.
> 
> [...]

Applied to mtd/next, thanks!

[1/1] mtd: physmap-core: Prioritize ofparts for OF probe
      commit: 8a565e3ee1eccaf7570a1c107b68327ba1a68b84

Patche(s) should be available on mtd/linux.git and will be
part of the next PR (provided that no robot complains by then).

Kind regards,
Miquèl


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