ioremap() fails for >64 MB
David H. Lynch Jr.
dhlii at dlasys.net
Wed Aug 23 07:05:01 EST 2006
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:
> Linuxppc-embedded mailing list
> Linuxppc-embedded at ozlabs.org
Dave Lynch DLA Systems
Software Development: Embedded Linux
717.627.3770 dhlii at 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."
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