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SubjectRe: [Re: 2.6.21-rc2-mm1] #error no ROMFS backing store interface configured
On Sun, 04 Mar 2007 12:58:39 +0100 Maciej Rutecki <maciej.rutecki@gmail.com> wrote:

> CC [M] fs/romfs/storage.o
> fs/romfs/storage.c:18:2: error: #error no ROMFS backing store interface
> configured
> make[3]: *** [fs/romfs/storage.o] Błąd 1
> make[2]: *** [fs/romfs] Błąd 2
> make[1]: *** [fs] Błąd 2
> make[1]: Opuszczenie katalogu `/usr/src/linux-mm'
> make: *** [debian/stamp-build-kernel] Błąd 2
>

+config ROMFS_ON_BLOCK
+ bool "Block device-backed ROM file system support"
+ depends on ROMFS_FS && BLOCK
+ help
+ This permits ROMFS to use block devices buffered through the page
+ cache as the medium from which to retrieve data. It does not allow
+ direct mapping of the medium.
+
+ If unsure, answer Y.
+
+config ROMFS_ON_MTD
+ bool "MTD-backed ROM file system support"
+ depends on ROMFS_FS && MTD
+ help
+ This permits ROMFS to use MTD based devices directly, without the
+ intercession of the block layer (which may have been disabled). It
+ also allows direct mapping of MTD devices through romfs files under
+ NOMMU conditions if the underlying device is directly addressable by
+ the CPU.
+

So we require that one of these be enabled if ROMFS.

There's a way of doing that, but I forget what it is. iirc Adrian has done
this in the past and can perhaps point us at an example?
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