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Date: Mon, 08 Oct 2001 16:18:25 -0700
From: Petko Manolov <pmanolov@Lnxw.COM>
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To: "David S. Miller" <davem@redhat.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: discontig physical memory
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		<3BC22EA6.696604E7@lnxw.com> <20011008.160528.85686937.davem@redhat.com>
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I already did that. I fixed MAX_DMA_ADDRESS and the
kernel now reports:

zone(0): 1024 pages
zone(1): 7168 pages	/* this should be 4096 */
...

Which is not true as we have a gap between 4 - 16MB
phys memory. I also played with add_memory_region(),
but the kernel still think we have 32MB ram instead
of 20MB as is the case.

Also it lock solid in __get_free_pages in mem_init()
Probably this is related to zone(1) wrong assumption
right?


best,
Petko



"David S. Miller" wrote:
> 
>    From: Petko Manolov <pmanolov@Lnxw.COM>
>    Date: Mon, 08 Oct 2001 15:54:30 -0700
> 
>    Any ideas how to make lowest 4MB allocatable throu
>    kmalloc(size, GFP_DMA) without breaking the kernel?
> 
> Setup ZONE_DMA correctly at boot time.
> 
> See the code around the free_area_init() call in
> arch/i386/mm/init.c for an example of how to do this.
> Intel does it for the low 16MB, you would just do it
> for the low 4MB.
> 
> Franks a lot,
> David S. Miller
> davem@redhat.com
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