I'm trying it now...does this compell a rebuild of ofwboot,
the kernel, or
both? I'm trying to avoid the netbsd-4 build world ~BAS
On Mon, 13 Feb 2006, Chuck Silvers wrote:
> On Fri, Feb 10, 2006 at 02:33:42PM +0100, Antoine
Reilles wrote:
>> After looking at the ofwinit routine in openbsd, I
tried to add code to
>> save and restore return address, and now, i can
boot a GENERIC macppc
>> kernel on my powerbook 6,8
>>
>> I don't exactly know why it was not working before,
neither why exactly
>> it does not, but so far three different kernels
with different config,
>> but the same tweak to boot without problem.
>> It is also surely related to the problem Olivier
was experiencing
>> (http://mail-index.netbsd.org/port-macppc/2005/12/27
/0001.html),
>> or davide
>> (http://mail-index.netbsd.org/port-macppc/2004/08/30
/0010.html), and
>> also PR #22316.
>>
>> Here the patch i used.
>> I borrowed those lines from openbsd, so they use
%r, since they
>> converted all their assembly to that.
>> Can someone who has a clue please look at it ?
>
> the openbsd version of this code saves and restores
those caller-saved
> registers around calling some functions (savemmu and
save_ofw_mapping).
> since ofwinit() in netbsd doesn't call any functions
(outside the
> FIRMWORKSBUGS case, which does its own save-and-restore
dance and
> is not enabled for macppc), saving and restoring those
registers
> is not necessary. if this change really is making a
difference for you,
> then I would guess that it's because it changes the
position of the
> instructions that come after your change. if that's
true, then adding
> the same number of nop instructions instead of the
other instructions
> would work just as well. could you give that a try?
>
> -Chuck
>
l8*
-lava (Brian A. Seklecki - Pittsburgh, PA, USA)
http://www.spiritu
al-machines.org/
"Guilty? Yeah. But he knows it. I mean, you're
guilty.
You just don't know it. So who's really in jail?"
~James Maynard Keenan
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