[RFC, PATCH 3/3] arm: remove machine_desc.io_pg_offst and .phys_io

[Nicolas Pitre]

On Wed, 21 Jul 2010, Russell King - ARM Linux wrote:

> On Tue, Jul 20, 2010 at 02:32:38PM +0200, Jeremy Kerr wrote:
> > Hi all,
> > 
> > > OK, so I should request Stephen to add this branch to linux-next,
> > > including the fixups?
> > > 
> > 
> > Hm, before I do that I should probably work out what to do in the
> > CONFIG_DEBUG_ICEDCC case. How about returning 0x0 as the phys address in
> > this case (ie, addruart -> mov \rp, #0), and skip setting up the mapping
> > if addruart gives this zero address?
> 
> It's extremely unlikely to have a UART at address 0 (because that's by
> default where the CPU jumps to on reset.)  That's not to say it could
> never happen - it's possible to hard-wire the CPU into 'hivec' mode
> where it'll instead jump to 0xffff0000.  In that case, if you're sane
> you'd put your SDRAM at 0x00000000.

Using the value -1 is probably a better choice in this case.


Nicolas