From: "Grant Likely" <grant.likely@secretlab.ca>
To: florian.belser@freenet.de
Cc: linuxppc-dev@ozlabs.org
Subject: Re: mpc5200b configure nand driver via dts
Date: Mon, 12 Jan 2009 07:48:42 -0700 [thread overview]
Message-ID: <fa686aa40901120648x3c224999sd0da6e80e4fd43be@mail.gmail.com> (raw)
In-Reply-To: <c4fbc703368c62be70c700e6f962eb12@email.freenet.de>
On Mon, Jan 12, 2009 at 2:07 AM, <florian.belser@freenet.de> wrote:
> hello,
>
> I have some problems with an mpc5200b based board. It's nearly compatible to
> the lite5200b board.
> I connected an samsung k9k8g08u0a nand flash via the lpb bus. This works
> fine with an self written nand driver.
> Now I try to use the standard nand driver from linux and configure it via
> the dts file. But this doesn't work and I get
> the following output:
>
> nand@1,0 { //cs1
> compatible = "samsung, k9k8g08u08", "cfi-flash";
^^^^^^^^^
NAND Flash is not a CFI flash device. The cfi-flash driver won't work with it.
> Now my questions are:
> Is there any error in the dts configuration?
> Is it principle posible to configure a nand flash via the dts file (in
> combination with mpc5200b)?
It is possible to *describe* the NAND flash via the dts file. The dts
file doesn't configure anything. It just describes the hardware
layout so that you can write or bind the appropriate driver to the
device. I don't know if a device tree binding has been defined for
NAND flash yet.
> I read in some forums that the nand flash must be activated in the u-boot
> before it can be configured via dts.
You definitely need to set up the CS line for the NAND before using it
in Linux. Typically this is done in U-Boot, but in a pinch it can be
done in the platform support code (arch/powerpc/platforms/52xx/*)
g.
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
next prev parent reply other threads:[~2009-01-12 14:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 9:07 mpc5200b configure nand driver via dts florian.belser
2009-01-12 14:48 ` Grant Likely [this message]
2009-01-12 15:59 ` Wolfgang Grandegger
-- strict thread matches above, loose matches on Subject: below --
2009-01-14 7:42 florian.belser
2009-01-14 9:05 ` Wolfgang Grandegger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=fa686aa40901120648x3c224999sd0da6e80e4fd43be@mail.gmail.com \
--to=grant.likely@secretlab.ca \
--cc=florian.belser@freenet.de \
--cc=linuxppc-dev@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).