[PATCH v2 0/3] mtd: maps: vmu-flash: Fix build and runtime errors

Florian Fuchs
2026-04-27T11:51:23Z

Hi all,

This small series fixes build and runtime errors in the vmu-flash driver
(enabled by CONFIG_MTD_VMU) and the included maple.h. These changes were
verified on real Dreamcast hardware with a physical VMU. The VMU can now
be successfully probed, read and written with MTD tools like mtdinfo and
mtd_debug. Previously, the driver failed to build or crashed during
probing.

bash-5.3# mtdinfo /dev/mtd0
mtd0
Name: vmu2.1.0
Type: mlc-nand
Eraseblock size: 512 bytes
Amount of eraseblocks: 256 (131072 bytes, 128.0 KiB)
Minimum input/output unit size: 512 bytes
Sub-page size: 512 bytes
Character device major/minor: 90:0
Bad blocks are allowed: true
Device is writable: true

Thanks,
Florian
---
v1->v2: Rebased patches and fixed the hotplug issues in other sh
patches.

v1: https://lore.kernel.org/linux-mtd/20251117224408.498449-1-fuchsfl@gmail.com/

The original v1 was postponed to fix the hotplug issue and other runtime
panics, that are fixed in the following patch:
"[PATCH v2] sh: maple: fix empty port handling":
https://lore.kernel.org/linux-sh/20260426212714.2286437-1-fuchsfl@gmail.com/

Note that in order to use the VMUs while there are empty ports, it
requires the above patch.

Florian Fuchs (3):
mtd: maps: vmu-flash: fix build error due to missing include of
linux/device.h
mtd: maps: vmu-flash: fix fault in unaligned fixup
mtd: maps: vmu-flash: Fix NULL pointer dereference in initialization

drivers/mtd/maps/vmu-flash.c | 7 ++++---
include/linux/maple.h | 3 +--
2 files changed, 5 insertions(+), 5 deletions(-)

base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f