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Re: early_ioremap for MIPS

To: macro@linux-mips.org
Subject: Re: early_ioremap for MIPS
From: "M. Warner Losh" <imp@bsdimp.com>
Date: Sun, 10 Feb 2008 15:44:01 -0700 (MST)
Cc: florian.fainelli@telecomint.eu, linux-mips@linux-mips.org
In-reply-to: <Pine.LNX.4.64N.0802081058350.7017@blysk.ds.pg.gda.pl>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <200802071932.23965.florian.fainelli@telecomint.eu> <Pine.LNX.4.64N.0802081058350.7017@blysk.ds.pg.gda.pl>
Sender: linux-mips-bounce@linux-mips.org
In message: <Pine.LNX.4.64N.0802081058350.7017@blysk.ds.pg.gda.pl>
            "Maciej W. Rozycki" <macro@linux-mips.org> writes:
: On Thu, 7 Feb 2008, Florian Fainelli wrote:
: 
: > Is there any need for early_ioremap on MIPS ? Seems like only x86_64 is 
: > implementing it for now.
: 
:  There is hardly any need as generally KSEG0/KSEG1 and XPHYS mappings 
: fulfil the need and are always available, even before paging has been 
: initialised.  Some 32-bit systems with devices outside low 512MB of 
: physical address space could potentially benefit though.  I recall some 
: Alchemy systems may fall into this category.

The Acer Pica machines, as well as the Deskstation Tynes, had devices
mapped outside of this range...  Of course Ralf will be able to say
more, if he chooses to jump into the way-back machine...

Warner

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