PPC64 boot failure with 2.6.15

[Anton Blanchard]

Hi,

> After succeeding to get 2.4.26 working on my machine (an IBM 9076-N81 
> high node), I'm trying to get 2.6 to work on it.  So far, the kernel 
> fails to boot, and the machine resets partway through bootup.  I've 
> tried compiling both an SMP and UP 2.6.15.1 kernel (unmodified 
> kernel.org sources).

Excellent! Ive been wanting to get these machines booting again but our
one isnt setup right now. There is one known issue:

  mpic: Setting upMPIC     " version 1.2 at fec000max 1 CPUs

Notice the max 1 CPUs. I forgot to tell benh when he was reworking the
openpic code that we cant rely on the nr cpus field to be correct :)

Paul had a patch to fix this, I'll see if I can find it.

If you feel keen you could hack it up by changing the following code in
arch/powerpc/sysdev/mpic.c:

        /* Map the per-CPU registers */
        for (i = 0; i < mpic->num_cpus; i++) {
                mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE +
                                           i * MPIC_CPU_STRIDE, 0x1000);
                BUG_ON(mpic->cpuregs[i] == NULL);
        }

And replace the for loop with for_each_cpu()

Anton