Re: [Gumstix-users] mtd partitions

[Craig H. <cr...@gu...>]

On Aug 20, 2007, at 5:20 PM, Darren Gibbs wrote:

> I have a 4MB basix that I wanted to update to the latest and
> greatest.  After downloading and building the new rootfs, I see the
> default has gotten big!  8MB now!  I turned off a bunch of stuff I
> don't need (bluetooth, ethernet, C++, etc) and got my jffs2 image
> down to 3.2MB.  It boots, but complains about being out of space.
> When I log in over serial and do a "df" it says my filesystem is only
> 2.8MB.  Looking at the boot spew, I see "Creating 3 MTD partitions on
> "Gumstix Flash ROM".  In the past I've only seen 2 partitions, it
> looks like the kernel and rootfs are now in their own partitions.
> Could someone clue me in on how to go back to 2 so I have enough
> space for a 3.2MB image in the rootfs partition?  Or what do I do to
> u-boot so it uses the 3rd partition?

The 3rd partition is for the uImage, which is now stored outside the  
rootfs.  1MB of flash is reserved for this, leaving 4M-1M-256k = 2.8M  
for the rootfs on a 4MB device.  You'll have to reduce your rootfs  
size further, or else remove the patch which does this in linux,  
which can be done like this:

cd /path/to/buildroot/build_arm_nofpu/linux-*
export QUILT_PATCHES=`cat .patched`
`pwd`/../../toolchain/quilt/bin/quilt --quiltrc `pwd`/../../toolchain/ 
quilt/quilt.quiltrc pop uImage-in-own-partition.patch
`pwd`/../../toolchain/quilt/bin/quilt --quiltrc `pwd`/../../toolchain/ 
quilt/quilt.quiltrc pop
`pwd`/../../toolchain/quilt/bin/quilt --quiltrc `pwd`/../../toolchain/ 
quilt/quilt.quiltrc delete -n
`pwd`/../../toolchain/quilt/bin/quilt --quiltrc `pwd`/../../toolchain/ 
quilt/quilt.quiltrc push -a
make -j3 ARCH=arm CROSS_COMPILE=`pwd`/../staging_dir/bin/arm-linux-
cd ../..
make
mkdir -p build_arm_nofpu/root/boot
cp uImage build_arm_nofpu/root/boot/
make

That will then spit out a rootfs.arm_nofpu.jffs2 which has the uImage  
inside it.  You'll need to make sure u-boot is using fsload and not  
katload to load the kernel image then too.

C