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Date: Thu, 27 Sep 2007 19:03:39 +0200
From: Olivier Houchard <mlfbsd@ci0.org>
To: Marius Nuennerich <marius.nuennerich@gmx.de>
Message-ID: <20070927170339.GA11021@ci0.org>
References: <20070927171822.0bdec7d9@sol.hackerzberg.local>
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Cc: freebsd-arm@freebsd.org
Subject: Re: Comment bug in locore.S?
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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.

> Any idea why the mapping doesn't work?
> I needed to map the uart with
> MMU_INIT(0x50000000, 0x50000000, 1, L1_TYPE_S|L1_S_AP(AP_KRW))
> which worked (I can still put chars after the mmu gets enabled).
> 
> 
> Kind regards
> Marius

Regards,

Olivier