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Subject: Re: atmel_nand, DMA, and "Fall back to CPU I/O"
From: Artem Bityutskiy <dedekind1@gmail.com>
To: George Pontis <GPontis@z9.com>
Date: Wed, 02 May 2012 14:53:39 +0300
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On Wed, 2012-04-25 at 15:09 -0700, George Pontis wrote:
> Working with 3.0.13 kernel and the at91sam9g45, 8b NAND flash with rootfs=
 in
> NAND
>=20
> At boot, the kernel shows 22 DMA warnings, then another 260 as UBIFS moun=
ts
> the root FS:
>=20
> atmel_nand atmel_nand: Fall back to CPU I/O
>=20

Unfortunately UBI and UBIFS use vmalloced memory for I/O and many people
yelled but no one cared to fix this. I think we should make UBI/UBIFS to
use kmalloc()'ed memory instead.


--=20
Best Regards,
Artem Bityutskiy

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