Re: my Cubieboard runs Debian Jessie
+++ Luke Kenneth Casson Leighton [2013-05-10 08:59 +0100]:
> On Fri, May 10, 2013 at 5:26 AM, Paul Wise <pabs@debian.org> wrote:
> > On Fri, May 10, 2013 at 4:29 AM, Jean-Marc wrote:
> >
> >> I used ext4 to create the NAND FS.
> >
> > Are you sure about that? I didn't think block-device based filesystems
> > could be used on MTD/NAND devices?
>
> paul: the nand driver from allwinner is a bit odd, it's non-standard
> i.e. does not conform to the de-facto standards laid down by the linux
> kernel. it's making life a leetle awkward for people who really
> really want direct NAND access, but hey.
The low-level NAND driver is presenting a block device rather than an MTD
device? Doesn't that mean it's got a built-in FTL of some sort? Does
the SOC actually have a fancy nand controller built-in so you don't
get direct NAND page access? (I've not looked at the chip specs).
<fx: has a google>
hmm, seems it does have a fancy controller:
http://lists.phcomp.co.uk/pipermail/arm-netbook/2012-September/005740.html
http://rhombus-tech.net/allwinner_a10/A10_register_guide/A10_NAND/
But we think that raw page access is probably also available, but
no-one's telling how it's done? Is that likely to get fixed at some
point?
Wookey
--
Principal hats: Linaro, Emdebian, Wookware, Balloonboard, ARM
http://wookware.org/
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