Re: [PATCH 2/3] mtd: maps: remove uclinux map driver

["Arnd Bergmann" <arnd@arndb.de>]

On Thu, Jun 25, 2026, at 14:07, Greg Ungerer wrote:
> On 26/5/26 20:32, Arnd Bergmann wrote:
>
> It is used on some ColdFire platforms, and was working all the way up
> to being removed in the current merge window.
>
> The ColdFire platform startup code (arch/m68k/coldfire/head.S) has a
> somewhat unusual setup that can copy an attached filesystem blob to
> _bss_stop, and this is one of the places the uclinux.c map driver can
> use as the filesystem memory address. From uclinux.c
>
>      static int __init uclinux_mtd_init(void)
>      {
>          struct mtd_info *mtd;
>          struct map_info *mapp;
>
>          mapp = &uclinux_ram_map;
>
>          if (physaddr == -1)
>                  mapp->phys = (resource_size_t)__bss_stop;
>          else
>                  mapp->phys = physaddr;
>
> No out of tree code is required. Most of the ColdFire defconfigs have
> CONFIG_MTD_UCLINUX enabled, since it is commonly used.

I see, this is surprising from reading the source and
git history, but I can see exactly how it got there.

So this is not actually a device but rather a replacement
for CONFIG_BLK_DEV_INITRD that does can work with CONFIG_BLOCK=y,
right?

> Can we get this reverted?

Yes, of course. Miquel/Richard/Vignesh, should I send a revert or
can you just apply one with Greg's explanation and my Ack?

     Arnd

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