On 8/15/07, Scott Wood <scottwood@freescale.com> wrote:

mike zheng wrote:
> Unfortunately, all the applications are running on 2.4 kernel. I can not
> just throw the 2.4 kernel.

And in what way does 2.6 break these applications?

All the device drivers are based on 2.4 kernel. We plan to upgrade to 2.6 in the middle of next year.

> I took the some core specific code from
> ppc.bkbits.net, such as head_e500.S and mpc85xx_cds_common.c. I assume the
> image should work on the 8548 CDS board, or at least for the bootup. I shall
> able to have the serial port working in platform_init(). However , the
> code stops in the head_e500.S. This does not make any sense. Please correct
> me if I am wrong.

Of course it makes sense -- you can't just go around ripping random
files from a codebase, sticking them in a version from several years
earlier, and expecting it to "just work".

All those files are e500 core specific. When we use bootm from Uboot to start the kernel, head_e500.S is first file being called, and then the mpc85xx_cds_common.c. I also merged some BOOKE related include files into our source tree as well.

Our 2.4 kernel version is different from ppc.bkbits.net. I did not expect it "just work". However the serial console should come out when platform_init() called. Everything before that is the same for any processor with e500 core.

> Any suggest or comment is welcome, I am struggling with this issue for
> almost one week...... :-(

How long would you have struggled with getting your applications running
on a more recent kernel instead?

Don't know, maybe 16 weeks. That is out of my control. I only deal with the kernel.....:-)

-Scott