[microblaze-uclinux] Patch for CRAMFS rootfs

["Steve Magnani" <steve@xxxxxxxxxxxxxxx>]

Michal / John -

I was working on this yesterday and it occurs to me that although the 
patch is technically trivial, there are some logistical issues because it 
crosses subsystems. 

Both arch/microblaze/kernel/setup.c and drivers/mtd/maps/uclinux.c need 
the ability to determine the length of the root filesystem. I think the 
best solution locates the code to do this in uclinux.c, where it would be 
available to architectures (such as microblaze) that need it, rather than 
having each architecture replicate the code. 

I would be surprised if a patch to uclinux.c coming from me would make it 
into 2.6.30 at this stage of the cycle. So I propose doing this in 3 
parts:

1. Patch the existing code in arch/microblaze/kernel/setup.c. This would 
make that code correct, but not useful, because changes to uclinux.c (and 
arch/microblaze/mm/init.c) are also needed in order to boot a Petalinux-
style cramfs. 

2. Submit a patch to uclinux.c that ports a modified version of the 
get_romfs_len() function in the Petalinux variant of the kernel. I 
believe this would go to David Woodhouse.

3. Post a second patch to arch/microblaze/kernel/setup.c that eliminates 
its local get_romfs_len() and uses the uclinux function instead. This 
patch could not be applied until after (2).

I believe the word "hack" was used at one point in our recent cramfs 
discussion...if (2) is likely to re-ignite some religious war between 
uCLinux folks and the rest of the kernel community, I'd rather not waste 
my time attempting it.

What do you think?

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