Notices

WARNING: DO NOT RUN mmc-unionfs boot-disable. I just did and it went and deleted all my links in the /etc/rc2.d/ folder.
I'm working on a fix. But do not touch the boot options for your own safety.

Hi, I've compiled union-fs for os2008.

What is it?

From http://www.hczim.de/software/mmc-unionfs.html

How to install:

1. You need a kernel with case_copy symbol enabled.

To build your own:
Grab the unionfs patch from here: http://download.filesystems.org/unio...6.21.7.diff.gz
Grab fanoush's patch to enable menu makeconfig and enable unionfs as a module.
Open arch/arm/kernel/armksyms.c and insert EXPORT_SYMBOL(copy_page); after EXPORT_SYMBOL(__strncpy_from_user);

Or grab one of these already compiled kernels:

Standard kernel with case_copy:
http://www.mediafire.com/?byzz1y9ojmf

This is my experimental kernel. It may have problems in it but it's the one I'm running. Contains the features of Fanoush's kernel (fixed rotation, 48Hz Faster MMC, extended brightness & crypto api) , plus the USB DMA & Powercheck disabled, LUKS, IPv6 and the case copy symbol. Be careful when using this one.

http://www.mediafire.com/?jx1s1qsyyin

You can flash a kernel with the Linux/Mac flasher-3.0 or on the device with Fanoush's kernel_flasher.

2. Learn how to prepare your memory card for this here:
http://www.hczim.de/software/mmc-unionfs.html

Install this deb:
http://www.mediafire.com/?dcewxtsnmyy

(It says 2.6.12.3 but it's for 2.6.21 - the kernel in OS2008)

I modified the old one and fixed it up so it would work on OS2008.

sudo gainroot
dpkg -i mmc-unionfs-2.6.12.3-omap1-2.3.deb
cd to /var/lib/install/usr/share/mmc-unionfs
./setup.

Enable mmc-unionfs and enjoy

*I tried enabling bootup option and I get on startup

Problems and todo.
mmc-unionfs: 0.3.1
mmc-unionfs: searching for mmc-union on MMC partitions
mmc-unionfs: trying: mmcblk0p1 ... mmc-unionfs: trying to mount /dev/mmcblk0p1 on /media/mmmmc-unionfs: Didn't find any valid partition.
mmc-unionfs: Partitions searched: mmcblk0p1
mmc-unionfs: No mmc-union found. Please setup one firstmmc-unionfs: Errors, aborting.
The init script runs at S00, at which point do mmc cards get mounted and how do I manually mount a card in that script?
Extending /home/user segfaults.

Fix unionfs enabling on boot.
Add an option to modify the mmc's scripts so it will unmount your unionfs partition and remount when taken out.
Fix boot-disable option. **** just went and deleted RC2 folder.

Bump,

Post updated with an much easier way of installing.

qwerty12, really, your hypocrisy knows no bounds!

Hehe, what can I say

I do think mmc boot is better but my mmc cards are quite small and I get i/o errors which in the end destroy my mmc boot.

So this is more space saving and less wearing on my mmc

This would be nice to install on a fresh os flash... where you might flag the internal 256megs to be a read only partition and union mount a partition on sd.

When you screw it up just create a new partition on mmc and union it back to original fs.

The eee does this with their xandros os install... its readonly partition and the other partition is user files/progs.

Additionally this would have added benefit that you could back up the mmc image and its basically just backing up whats 'different from base install'.

Nice idea ,infact it could be compiled straight into kernel for that purpose.

But I don't have the time or knowledge to maintain this. The kernel module is fine, it's just that the shell scripts needs fixing so if anyone is interested...

Here's a bump.

I compiled the latest aufs from their cvs. I changed it to use atomic_cmpxchg instead of cmpxchg. To use cmpxchg means kernel modifications which puts me in same situation as unionfs so I chose to use atomic_cmpxchg. This module will insert on any 2.6.21-omap1 kernel that is flashed on your tablets (48 Mhz, rotation etc).

http://qwerty12.maemobox.org/modules_libs/aufs.ko