linux-kernel - Re: [PATCH 5/5] arm64: add early

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Date:	Wed, 05 Mar 2014 11:38:44 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Linaro Patches <patches@...aro.org>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 5/5] arm64: add early_ioremap support

On Tue, 2014-03-04 at 17:31 -0600, Rob Herring wrote:
> On Tue, Mar 4, 2014 at 2:08 PM, Mark Salter <msalter@...hat.com> wrote:
> > Add support for early IO or memory mappings which are needed
> > before the normal ioremap() is usable. This also adds fixmap
> > support for permanent fixed mappings such as that used by the
> > earlyprintk device register region.
> 
> One minor comment:
> 
> > +enum fixed_addresses {
> > +       FIX_EARLYCON,
> 
> Can you align this name with x86 and rename to FIX_EARLYCON_MEM_BASE.
> Doing that will help enable the earlycon driver in 8250_early.c.

Is there any advantage to earlycon=uart8250 vs. earlyprintk=uart8250?
I don't mind using FIX_EARLYCON_MEM_BASE, but CONFIG_FIX_EARLYCON_MEM
is X86 only right now and I think changing that should be a separate
patch.


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