From: "David H. Lynch Jr." <dhlii@dlasys.net>
To: Alex Zeffertt <ajz@cambridgebroadband.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: ioremap() fails for >64 MB
Date: Tue, 22 Aug 2006 17:05:01 -0400 [thread overview]
Message-ID: <44EB717D.3080800@dlasys.net> (raw)
In-Reply-To: <44EAC56D.5020508@cambridgebroadband.com>
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is ioremap() failing or is vmalloc failing ?
ioremap should just assign a virtual address to a physical address -
does it actually allocate anything ?
I beleive I am ioremap()ing a greater than 64MB Flash ROM and I do
not think it is failing.
Alex Zeffertt wrote:
> Phil Nitschke wrote:
>
>> Hi all,
>>
>> I have 2 GB memory on a 7448 processor, and want to reserve a huge chunk
>> of it at boot-time, then ioremap() it into the kernel space inside a
>> device driver. So far I've succeeded with 64 MB, but can't go any
>> higher, as mm/vmalloc.c tells me: "allocation failed: out of vmalloc
>> space - use vmalloc=<size> to increase size."
>>
>>
>
> I remember reading in Linux Device Drivers that you can use the bigphysarea
> patch to allocate large memory, as long as you do it at boot time. It seems
> it's been ported to 2.6 too:
>
> http://lwn.net/Articles/111132/
>
> Alex
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
--
Dave Lynch DLA Systems
Software Development: Embedded Linux
717.627.3770 dhlii@dlasys.net http://www.dlasys.net
fax: 1.253.369.9244 Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too numerous to list.
"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
Albert Einstein
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next prev parent reply other threads:[~2006-08-22 21:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-22 7:41 ioremap() fails for >64 MB Phil Nitschke
2006-08-22 8:50 ` Alex Zeffertt
2006-08-22 21:05 ` David H. Lynch Jr. [this message]
2006-08-23 14:05 ` Matt Porter
2006-08-22 14:22 ` Matt Porter
2006-08-23 10:00 ` Phil Nitschke
2006-08-23 11:51 ` Dan Malek
2006-08-24 2:54 ` alva
2006-08-24 12:25 ` Matt Porter
2006-08-24 12:56 ` Matt Porter
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