From: MikeW <mw_phil@yahoo.co.uk>
To: linux-mtd@lists.infradead.org
Subject: Re: Problems with ST NAND512W3A nand flash
Date: Wed, 16 May 2007 16:50:16 +0000 (UTC) [thread overview]
Message-ID: <loom.20070516T184549-325@post.gmane.org> (raw)
In-Reply-To: 464B17F3.9040804@users.sourceforge.net
Savin Zlobec <savinz <at> users.sourceforge.net> writes:
>
> Hi All!
>
> I am working on a AT91RM9200 based board with ST NAND512W3A2B flash.
> Kernel version is 2.6.19.7 with patches from maxim.org.za/at91_26.html.
> Everything works perfectly, except for boot time NAND chip
> identification which fails every once in a while. NAND signature
> is 0x20 0x76, but sometimes I get 0x20 0x20. My first guess was
> timing problems, but I've double checked everything and all signals
> are inside the specs. I've also tested the chip with shorter and
> longer setup, hold and pulse times for read and write, but without
> any success. Trying different kernels didn't help either.
>
> Any ideas and/or comments would be very much appreciated.
>
> Thanks,
> savin
a) power supply tolerance; psu noise ?
b) is the second 0x20 a 'repeat' of the first ? in which case will an
extra read give you the required 0x76 ? [if chipid==mfrid reread chipid]
May be a chip problem - it does happen !
MikeW
next prev parent reply other threads:[~2007-05-16 16:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-16 14:40 Problems with ST NAND512W3A nand flash Savin Zlobec
2007-05-16 16:50 ` MikeW [this message]
2007-05-17 15:45 ` Savin Zlobec
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=loom.20070516T184549-325@post.gmane.org \
--to=mw_phil@yahoo.co.uk \
--cc=linux-mtd@lists.infradead.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