Re: installing on a g5

[Christian Groessler <chris%groessler.org@localhost>]

On 04/12/14 11:24, Phileas Fogg wrote:
> On 04/11/2014 09:33 PM, Christian Groessler wrote:
> > Hi,
> >
> > On 04/10/14 10:48, Phileas Fogg wrote:
> > > One more thing.
> > > On my G5 it is importnat to apply the patch ofw_machdep.c.patch else
> > > my kernel hangs just like yours.
> > > I don't know why yet.
> >
> >
> > Hmm, seems printfs are evil at this moment.
> >
> > On my machine it crashes in sys/arch/powerpc/oea/ofw_consinit.c, line
> > 309, when it issues a printf.
> >
> > regards,
> > chris
>
> hmm,
>
> in such a case you should try to narrow down the piece of code which 
> hangs. for such cases where you cannot rely on prinbf i used a simple 
> method painting my screen in certain color, like this:
>
> void paint(unsigned int color)
> {
>     static volatile unsigned int *base = (volatile unsigned int *) 
> 0x98020000;
>     static unsigned int size = 0x2000;
>     static volatile unsigned int *ptr;
>
>     ptr = base;
>
>     while (ptr <= base + size) {
>         *ptr = color;
>         __asm __volatile ("sync");
>         __asm __volatile ("dcbst 0,%0" :: "r"((unsigned int) ptr));
>         __asm __volatile ("sync");
>         ptr++;
>     }
> }
>
>
> Declare this function and then use it somewhere where you think it 
> hangs and see if you reach that place. That piece of code helped me 
> debugging MMU problems and in other places where prinntf is not 
> working yet.


I was using this approach:

Define

#if 1 //def OFDEBUG
extern void ofprint(const char *, ...);
#define OFPRINTF ofprint
#else
#define OFPRINTF while(0) printf
#endif

and then use

OFPRINTF("I'm here\r\n");

in the code.


It crashes when it calls *cn_tab->cn-putc() in sys/dev/cons.c(cnputc).


I've some questions:

- ofwoea_initppc calls OF_quiesce if it's a PowerMac11,1 or 11,2. What 
does this function do and why is it needed? I didn't see much difference 
when I called it.

- The POWERMAC_G5 config file has (commented) entries 'ofb*' and 
'wsdisplay0 at ofb*'. Your POWERMAC_G5_11_2 has 'genfb*' and 
'wsdisplay*' and genfb*'. The 32bit POWERMAC file has 'genfb*', too, but 
'wsdisplay at wsemuldisplaydev?'. What is wsemuldisplaydev? For 
starters, I would be satisfied with a very simple console, using OF_xxx 
calls.

regards,
chris