> I would like to want to know how I can mount root filesystem from ROM or
> FlashROM which are memory-mapped.
> Because of memory-mapped (Flash)ROM which are not in RAM address space,
> I'm not sure it is OK to use initial ramdisk.
>
> Anyone has experience about this problem?
The empeg uses a 320k rom/flash disk (read only) for a halfway house boot
used when we upgrade the hard disk partitions/contents.
We do this just by setting the initrd start & end to point to the
appropriate place in flash (in our case I think it's 0xd00b0000 - 0xd0000000
is the base of flash in our memory map.
One thing you *do* have to patch is the code in arch/arm/setup.c which
checks to see if the initrd exists within physical RAM - obviously, it won't
in this case. Also, you can't use a compressed image as it's mounted
in-place without any RAM usage.
Hugo
empeg
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