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From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Thu, 1 Sep 2005 18:00:51 +0200
To: "Nghiem, Tien" <TNghiem@oerlikon.ca>
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Cc: linuxppc-dev@ozlabs.org, Marcin Dawidowicz <marcin.dawidowicz@kontron.pl>,
	Garcia =?ISO-8859-1?Q?J=E9r=E9mie?= <GARCIAJ@3il.fr>
Subject: Re: RE : Error while accessing physical address
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> unsigned short is 2 bytes, so you should use:
>
> regHdwAddress = (unsigned short *) ioremap((unsigned 
> short)address,0x2);

Nah.  The size doesn't matter that much (it will be mapped
with a page granularity anyway).  You just want to use

regHdwAddress = (unsigned short *)ioremap(address, 2);

Casting the address to unsigned short made the address 0x0400
instead of the address you wanted, so you destroy the ISI
vector when writing to it (and you might cause a cache paradox
as well, as the ioremap maps it uncacheable, and it might
already be in the cache at that time).


Segher