From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-embedded@ozlabs.org
Subject: Re: Maximum ioremap size for ppc arch?
Date: Mon, 3 Dec 2007 11:20:22 +0100 [thread overview]
Message-ID: <200712031120.22988.arnd@arndb.de> (raw)
In-Reply-To: <36D7B34A3A79F84F82FA0C154F299F2505FE26D2@E03MVX1-UKDY.domain1.systemhost.net>
On Monday 03 December 2007, michael.firth@bt.com wrote:
> I'm trying to get am MPC834x system running that has 256MBytes of NOR
> flash connected.
>
> The physmap flash driver is failing to ioremap() that amount of space,
> while on a similar system with 128Mbytes of flash, there are no
> problems.
>
> Is this a known limitation of ioremap() on the ppc architecture, or
> specifically the MPC834x family, and is there any (hopefully easy) way
> to increase this limit?
The amount of ioremap space is very limited on 32bit systems in general,
since most people are more interested in having a large physical address
space without highmem. Look at the definition of VMALLOC_START and
VMALLOC_END if you want to change the settings on your system.
Arnd <><
next prev parent reply other threads:[~2007-12-03 10:20 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-03 9:22 Maximum ioremap size for ppc arch? michael.firth
2007-12-03 10:20 ` Arnd Bergmann [this message]
2007-12-03 15:30 ` Matt Porter
2007-12-03 17:50 ` David Hawkins
2007-12-03 19:07 ` Matt Porter
2007-12-03 19:51 ` David Hawkins
2007-12-05 9:50 ` michael.firth
2007-12-05 17:46 ` Scott Wood
2007-12-05 17:50 ` Scott Wood
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