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List: linux-ia64
Subject: [Linux-ia64] mmap issue
From: "Matthews, Robert" <Robert.Matthews () COMPAQ ! com>
Date: 2001-03-12 21:31:27
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Has anyone tried using mmap to remap PCI device memory into user space? I
have seen the following problem: If I do the mmap, it returns successfully,
and I can indeed access the device memory. Unfortunately, the system will
hang within about a minute after doing so. I do not get an oops, or crash
of any kind, simply no further response form the machine. If I just do the
mmap and then munmap the system will not hang. But if I do one access to
the mmapped address, the system will hang. I am using the remap_page_range
call in my mmap routine, and this same code works on x86 and Alpha
platforms. I found it odd that it takes a while for the system to hang
after the access, is their something special I have to do for this to work
on IA64? I am running 2.4.1 with the 1/31 patch, although this problem
occurs on all previous kernels I have tried. Thanks in advance for any
insight anyone might have.
Robert Matthews
Evaluation Test Development
Compaq Computer Corp
Voice: (281)518-1950 Fax:(281)514-9541
robert.matthews@compaq.com
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