Comment bug in locore.S?

[Olivier Houchard]

On Thu, Sep 27, 2007 at 10:41:33PM +0200, Marius Nuennerich wrote:
> On Thu, 27 Sep 2007 19:03:39 +0200
> Olivier Houchard <mlfbsd at ci0.org> wrote:
> 
> > On Thu, Sep 27, 2007 at 05:18:22PM +0200, Marius Nuennerich wrote:
> > > Hi all,
> > > 
> > 
> > Hi Marius,
> > 
> > > I'm still trying to boot FreeBSD on the neo1973. So far I managed to
> > > put bytes over the serial console so I can see where I am. At the
> > > moment the (virtual) machine crashes in locore.S (1.16) line 170:
> > > ldr pc, .Lvirt_done
> > > 
> > > qemu: fatal: Trying to execute code outside RAM or ROM at 0xc0008???
> > > 
> > > Which I don't understand because the section should be mapped by the
> > > MMU to 0x30008??? at that time.
> > > 
> > > In line 137 the sequence in the comment is described as
> > > /* # of sections, PA|attr, VA */
> > > but in line 185 the order is
> > > n_sec, VA, PA|attr
> > > 
> > > Is the comment wrong?
> > > 
> > 
> > No the comment is right, 0xc0000000 should be mapped.
> > Did you define STARTUP_PAGETABLE_ADDR ? It's not marked as such, but it is
> > mandatory now.
> 
> Yes, in the kernel config there are these lines:
> makeoptions     KERNPHYSADDR=0x30008000
> makeoptions     KERNVIRTADDR=0xc0000000
> options         KERNPHYSADDR=0x30008000
> options         KERNVIRTADDR=0xc0000000
> options         PHYSADDR=0x30000000
> options         STARTUP_PAGETABLE_ADDR=0x30800000
> 
> It's from Andrew Turners config file which he posted on
> http://wiki.openmoko.org/wiki/FreeBSD
> in the tarball.
> 

Hmmm, I really see no reason why the PA <=> PA mapping would work, but not
the VA <=> PA one.
I'll try to setup qemu. Can it provide useful informations about its 
internal state, ie CPU registers, TLB, etc ?

Regards,

Olivier