It looks as though MMC cards should work just as well with the patch.
The key thing is the the package block-extroot supports MMC cards, and
it does appear to do so, with kmod-mmc enabling block-extroot. You would
presumably also need the kmod-mmc-over-gpio module.
Assuming that the MMC device that is mounted is /dev/mmcblk0p1 (although
I see no reason why it shouldn't work for /dev/mmcblk1p1 if you have two
cards), you would need the following configuration:
Edit /etc/config/fstab on the router's internal filesystem (the jffs2
overlay is fine), to add an entry:
config mount
option target /mnt/mmcroot # This string is ignored
option device /dev/mmcblk0p1
option options rw
option enabled 1
option enabled_fsck 0
option is_rootfs 1
On /dev/mmcblk0p1, in /etc/config/fstab, add an entry:
config mount
option target /mnt/mmcroot
option device /dev/mmcblk0p1
option options rw
option enabled 1
option enabled_fsck 0
option is_rootfs 1
option rootfs_subdir openwrt.overlay # or whatever
subdirectory of /dev/mmcblk0p1 you want
This should then boot the kernel on the router's flash, and overlay the
filesystem on the MMC card over the squashfs filesystem on the router.
To boot the kernel off the MMC card as well, you also would need to add
the patches at
https://lists.openwrt.org/pipermail/openwrt-devel/2010-April/006671.html
and configure /etc/config/kexec on the MMC partition being used.
Although it refers to USB, it should work just as well for MMC.
On Fri, 2010-04-09 at 05:32 -0400, RHS Linux User wrote:
> Hi,
>
> Neat... It would be *VERY* nice to be able to do the same thing with
> one or *TWO* MMC cards since they can be easily kludged onto a few GPIO
> pins. Maybe your patch already supports this?
>
> Wiz
>
>
> On Fri, 9 Apr 2010, Quentin Armitage wrote:
>
> > The block-extroot package adds the capability for preinit to mount /overlay
> > on an external USB device. The attached patch extends
> > the capability to allow /overlay to be mounted on a sub-directory of the
> > external USB device.
> >
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