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From: Luke -Jr <luke@dashjr.org>
Subject: Re: [Qemu-devel] MIPS emulation
Date: Sat, 28 Jun 2008 17:12:59 -0500
References: <200806271350.40937.luke@dashjr.org>
	<200806280901.11619.luke@dashjr.org>
	<20080628193924.GE15737@networkno.de>
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To: Thiemo Seufer <ths@networkno.de>
Cc: qemu-devel@nongnu.org

On Saturday 28 June 2008, Thiemo Seufer wrote:
> Luke -Jr wrote:
> > On Friday 27 June 2008, Luke -Jr wrote:
> > > Is it possible to just emulate a MIPS CPU without any kind of ELF
> > > loader/BIOS/boot process, ideally letting me watch/debug the
> > > instruction flow and registers?
> >
> > In particular, I get this log output when I try to boot a flash image:
> >
> > cpu_mips_handle_mmu_fault pc bfc00000 ad bfc00000 rw 2 mmu_idx 0 smmu 1
> > cpu_mips_handle_mmu_fault address=bfc00000 ret 0 physical 1fc00000 prot 3
> > do_raise_exception_err: 15 0
> > do_interrupt enter: PC bfc00000 EPC 00000000 instruction bus error
> > exception do_interrupt: PC bfc00380 EPC bfc00000 cause 6
> >     S 00400006 C 00000418 A 00000000 D 00000000
> > do_raise_exception_err: 15 0
> > do_interrupt enter: PC bfc00380 EPC bfc00000 instruction bus error
> > exception do_interrupt: PC bfc00380 EPC bfc00000 cause 6
> >     S 00400006 C 00000418 A 00000000 D 00000000
>
> An "instruction bus error" means Qemu wasn't able to fetch an instruction
> from address 0xbfc00000, which should correspond to the very begin of
> your flash image. This looks like your Qemu build is broken for some
> reason. Did you build with gcc4, per chance?

No, I installed it with Gentoo, which forces manual GCC 3 selection.
Specifically, app-emulation/qemu-softmmu-0.9.1-r3 with USE='alsa gnutls kqemu 
sdl'