[Barrelfish-users] Problems with the MMU and a different memory layout

[Daniel Röhrig]

Hey Guys,

we think we might have stumbled upon a little mistake in your arm port 
that still works with the integratorcp boards but will cause problems on 
other boards.

In the boot.S, Line 140:
Are you sure you mean "mov r1, r1" and not "mov r1, r2"? mov r1, r1 is a 
nop and section_map will do exactly the same twice. But if you change it 
to mov r1, r2 you really do map the section containing the programm counter.

Regards
Daniel

On 16.07.2012 22:39, Daniel Röhrig wrote:
> Hey guys,
>
> we've been trying (rather unsuccessfully) to get Barrelfish up and
> running on a slightly changed integratorcp board in qemu. The problem
> is, we don't have memory at 0x0. Our memory starts at 0x20000000. We
> changed the boot.S to reflect these changes but as soon as we enable the
> mmu we get an prefetch abortion. And honestly we are running out of
> ideas why this keeps happening. We stepped through the whole process in
> gdb but everything seems fine.
>
> We would be very happy if somebody could take a look at our boot.S and
> point out the obvious mistake that we can't find.
> Here's the link:
>
> http://pastebin.com/KDE19qdu
>
> Thanks and cheers
> Daniel
>
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