Date   : Thu, 01 Feb 2001 09:24:28 +0000 (GMT)
From   : "Dr. David Gilbert" <gilbertd@...>
Subject: Re: second processor pictures

On Wed, 31 Jan 2001, Philip Blundell wrote:

> On Wed, 31 Jan 2001, Dr. David Gilbert wrote:
>
> >   1) Which ARM is in the eval kit? It could be a rare
> >      and mythical ARM1 which has a few things different from the ARM2
> >      onwards (in particular the multiply missing and I think some
> > exception handling a little different).
>
> I think the second processor boards were always fitted with ARM1.  The OS
> supports the basic input/output SWIs, and I think most of the kernel
> functionality, but not a lot else.  I don't recall anything being
> different about exceptions on ARM1, though I do have a vague feeling that
> it had an extra addressing mode that was later dropped.

Ah yes; it was the LDR Rs, [Rp, Rq shift Rr] I think - if I remember
correctly that either (can't remembe rwhich - or is it both?) frees up the
space which became MUL or is it what became undefined instructions (ARM1
not having had that?).  Also I don't think the ARM1 had copro?


Dave
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