[OpenBIOS] ppc(64) debugging

[Andreas Färber]

Am 01.11.2010 um 12:01 schrieb Mark Cave-Ayland:

> FWIW I had a problem with SPARC64 crashing gdb when I tried to step  
> through the initialisation, and in the end I found out that everyone  
> worked once the MMU had been initialised. So I ended up putting a  
> new label into entry.S just after the MMU had been enabled and  
> breaking there, at which point everything seemed to behave.

Thanks for the suggestion. There's been a certain lag in mail  
delivery...

Latest state with local patches is that hell breaks loose once the MMU  
is set up. I get a 0x400 (ISI) exception and when the bctrl to  
isi_exception() is executed, we end up at trap_error, where it  
branches to unexpected_excep() and tries to printk() to the serial  
port that's not yet set up. I'll put a few patches together.

Andreas