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by **?B¤_o** » Fri, 20 Apr 2001 13:50:56

I have a PCI device which have extra memory on it.
I want to use the ioremap() function to get a virtual address
so that I can access the memory.
But when I try to load the module, it fails and tells me ioremap() and
readb() are unresolved symbols.
I use 2.2.14 linux kernel.
Is there anybody who knows what's wrong?
or can you send me a simple example code to teach me how to use ioremap()
correctly?

best regards,
yu-chen

by **André Davi** » Fri, 20 Apr 2001 18:52:36

> I have a PCI device which have extra memory on it.
> I want to use the ioremap() function to get a virtual address
> so that I can access the memory.
> But when I try to load the module, it fails and tells me ioremap() and
> readb() are unresolved symbols.
> I use 2.2.14 linux kernel.
> Is there anybody who knows what's wrong?
> or can you send me a simple example code to teach me how to use ioremap()
> correctly?

Are you including the rigth stuff?

I'm using ioremap ok and I'm including these:

#ifndef __KERNEL__
# define __KERNEL__
#endif
#ifndef MODULE
# define MODULE
#endif

#define __NO_VERSION__
#include <linux/module.h>
#include <linux/version.h>

char kernel_version [] = UTS_RELEASE;

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/types.h>
#include <linux/malloc.h>
#include <linux/pci.h>
#include <linux/mm.h>
#include <asm/io.h>
#include <asm/string.h>

Hope it helps,

Andre

ps - If you measure read speed from the PCI board to memory, please tell
me the numbers. Thanks

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by **Grant Edwar** » Sat, 21 Apr 2001 00:30:54

>I have a PCI device which have extra memory on it.
>I want to use the ioremap() function to get a virtual address
>so that I can access the memory.
>But when I try to load the module, it fails and tells me ioremap() and
>readb() are unresolved symbols.
>I use 2.2.14 linux kernel.
>Is there anybody who knows what's wrong?
>or can you send me a simple example code to teach me how to use ioremap()
>correctly?

There's an example driver that does this at

ftp://ftp.visi.com/users/grante/stuff/demomm.tar.gz

It provides three minor devices that all support the memmap()
system call. Two of them map regions of memory on the PCI
board, and the third is a locked-down page of system RAM that
can be used as a DMA buffer.

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visi.com experience! I need an
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how to remap the memory on PCI card to a new virtual memory?

how to remap the memory on PCI card to a new virtual memory?