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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
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Subject: Re: [PATCH] Fix 8250 probe on ppc32
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> How early on can we use udbg? I'd be interested to see how this is  
> going to work out for 4xx/83xx/85xx w/built-in 8250's.

As soon as you can get something mapped I suppose... On ppc32 with
BootX, I setup a BAT in head.S, thus udbg is available in
machine_init(). On ppc64 with hypervisor console, we can enable hacks
that initialize udbg in real mode.

Ben.