Re: [microblaze-uclinux] patching the kernel

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Jim,

Jim Van Vorst wrote:
> Is it possible to patch the petalogix kernel from the patches either at 
> kernel.org or uclinux.org?  I.e. we have a linux-2.6.x-petalogix 
> directory which I think is at 2.6.20, and 2.6.23 is available at 
> uclinux.org.  Can I just sequentially apply those patches to upgrade my 
> kernel to .23?  Or are the petalogix kernel sources modified from the 
> uclinux sources, which are modified from the mainline sources?

It's not quite that simple, because in the mix are also the no-MMU 
specific patches maintained by SnapGear, which are part of the current 
petalinux 2.6.20 tree.

To rev up a petalinux tree to 2.6.23, the simplest way is probably as 
follows:

1. Take a stock 2.6.23 tree from kernel.org
2. apply the 2.6.23-uc0-bigpatch from uclinux.org
3. copy in the microblaze support (including drivers etc).

Another approach is

1. start with petalinux 2.6.20
2. reverse apply 2.6.20-uc0-bigpatch
3. apply 2.6.20-2.6.23 incremental patches from kernel.org
4. apply 2.6.23-uc0-bigpatch from uclinux.org

There'll be various conflicts and rejects patchsets to fix up as you go.

Unfortunately not a trivial task either way.

Regards,

John


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