-------- Original-Nachricht --------
> Datum: Tue, 15 Mar 2011 18:49:24 +0100
> Von: Sven Luther <s...@z-innov.com>
> An: Gerhard Pircher <gerhard_pirc...@gmx.net>
> CC: nello martuscielli <ppc.ad...@gmail.com>, linuxppc-dev@lists.ozlabs.org,
> acrux...@libero.it
> Betreff: Re: any chance to use a modern linux kernel on Pegasos1 G3 ?
> On Tue, Mar 15, 2011 at 06:14:48PM +0100, Gerhard Pircher wrote:
[...]
> > On the other side you mentioned this workaround in
> > arch/ppc/kernel/prom_init.c to me some time ago:
> >
> > unsigned long __init prom_init(int r3, int r4, prom_entry pp) :
> > > node = call_prom("finddevice", 1, 1, "/");
> > > rc = call_prom("getprop", 4, 1, node, "model", model,
> sizeof(model));
> > > if (rc > 0 && !strncmp (model, "Pegasos", 7)
> > > && strncmp (model, "Pegasos2", 8)) {
> > > /* Pegasos 1 has a broken translate method in the OF,
> > > * and furthermore the BATs are mapped 1:1 so the phys
> > > * address calculated above is correct, so let's use
> > > * it directly.
> > > */
> > > } else if (offset == 0) {
> > > /* If we are already running at 0xc0000000, we assume
> we were
> > > * loaded by an OF bootloader which did set a BAT for
> us.
> > > * This breaks OF translate so we force phys to be 0.
> > > */
> > > prom_print("(already at 0xc0000000) phys=0\n");
> > > phys = 0;
> > > } else if (call_prom("getprop", 4, 1, prom_chosen, "mmu",
> > > &prom_mmu, sizeof(prom_mmu)) <= 0) {
> > > prom_print(" no MMU found\n");
> > > } else if (call_prom_ret("call-method", 4, 4, result,
> "translate",
> > > prom_mmu, &_stext, 1) != 0) {
> > > prom_print(" (translate failed)\n");
> > > } else {
> > > /* We assume the phys. address size is 3 cells */
> > > phys = result[2];
> > > }
> >
> > Can anybody comment, if this "broken translate method in the OF" would
> > still be needed for arch/powerpc?
>
> Well, since this is long dead hardware not produced anymore, i don't see
> how the OF could have unbroken itself by moving to powerpc.
>
> It has been age since i looked into this, but to the best of my knowledge
> (and i wrote the above code or at least the earlier versions) it should
> be still broken.
Any idea then, how the workaround can be ported to arch/powerpc/ or if
there is a better one available?
regards,
Gerhard
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