Re: [PATCH] Incorrect segment 0 initialization for PMAC G5

[Michael <macallan%netbsd.org@localhost>]

Hello,

On Fri, 29 Mar 2013 20:26:14 +0100
Phileas Fogg <phileas-fogg%mail.ru@localhost> wrote:

> 3. Currently i'm stuck in 
> sys/arch/macppc/macppc/interrupts.c:init_interrupts because G5's U4 MPIC 
> is not found.

An extra match line in macppc/interrupts.c:init_openpic() should do it ( 
assuming it is sufficiently OpenPIC-like ).

> Why does NetBSD require the interrupt controller to be initialized 
> before configure process, why not use autoconf to autodetect interrupt 
> controllers too.

Because devices that need to register interrupts may attach before the
interrupt controller does. Also, there may be more than one ( for
example, some old world PowerBooks have two cascaded ohare PICs, some
ofppc or prep boxes have OpenPIC or IVR and an i8259 ) which would
complicate things further if each one would attach on its own. It's
just simpler this way.

> 4. The function ofwoea_initppc maps the OFW code+data at 0xff800000 to 
> 0x3fc00000. And that's not correct on my machine. On my G5 it's mapped
> to 0x7fc00000.

Yes, this needs to be fixed. I think the code assumes 1GB of RAM and
the address should be LOW_RAM_SIZE - 0x00400000.

have fun
Michael