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List:       linux-arm
Subject:    Re: virtual memory in arm linux
From:       Russell King - ARM Linux <linux () arm ! linux ! org ! uk>
Date:       2002-12-16 10:10:16
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On Sun, Dec 15, 2002 at 11:19:07PM -0800, denz aberilla wrote:
> I am using linux-2.5.30+ARM patch rmk1 on my custom board with ARM922
> processor.
> 
> I am using a one-is-to-one phys to virt memory mapping. The kernel runs quite
> ok even up to executing the first user-space application. I am using a ramdisk
> image with an ext2 filesystem.
> 
> So far, here's my output as the kernel executes the user-space application:
> 
> -- start of snippet --
> Running MainProc..
> running: /sbin/hello1 ...sys_fork
> memory.c:245: bad pmd 40000c12.
> -- end of snippet --
> 
> ... then the kernel hangs.

> To recall, I've patched in "__create_pagetables (head.S) and set_pgd
> (proc-arm922.S)" so that it'll create an entry for 4000xxxx address range and
> also in order to pass the invalidate TLB instruction.

This is why you're seeing the above problem.  You've just found the exact
reason for:

        if (md->virtual != vectors_base() && md->virtual < PAGE_OFFSET) {
                printk(KERN_WARNING "MM: not creating mapping for "
                       "0x%08lx at 0x%08lx in user region\n",
                       md->physical, md->virtual);
                return;
        }

Now, before I go any further, are you intending merging the support code
for this machine?

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