Re: Problem with ioremap which returns NULL in 2.6 kernel

From: Markus Lidel
Date: Fri Jul 16 2004 - 19:23:43 EST


Zwane Mwaikambo wrote:
probably too large an area to be remapping. Try remapping only the
memory area needed, and not the entire area.
Is there a way, to increase the size, which could be remapped, or is
there a way, to find out what is the maximum size which could be remapped?
Thank you very much for the fast answer!
You could try a 4G/4G enabled kernel, /proc/meminfo tells you how much
vmalloc (ioremap) space there is too.
VmallocTotal: 245752 kB
VmallocUsed: 137720 kB
VmallocChunk: 107904 kB
Okay, i see the problem now, the largest piece of memory which could be
allocated is 107904 kB, right?
Is the 4G/4G split already in the kernel? If yes, which entry activates it?
No it's not in the current kernel, you'd have to download the patch, the
most uptodate being the one in the Fedora/Redhat kernel tree.

Okay, thank you very much!

Best regards,

Markus Lidel
Markus Lidel (Senior IT Consultant)

Shadow Connect GmbH
Carl-Reisch-Weg 12
D-86381 Krumbach

Phone: +49 82 82/99 51-0
Fax: +49 82 82/99 51-11

E-Mail: Markus.Lidel@xxxxxxxxxxxxxxxxx

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