From: Pierre Kestener <pierre.kestener@cea.fr>
To: Pierre Kestener <pierre.kestener@cea.fr>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Virtex2pro OPB frequency 10/100Mbs ethernet link related problem
Date: Thu, 21 Apr 2005 17:17:56 +0200 [thread overview]
Message-ID: <4267C424.7000700@cea.fr> (raw)
In-Reply-To: <42662502.5060108@cea.fr>
Hello,
i made a mistake by downloading the wrong bitstream into the virtex,
so the linux kernel was ok but not the FPGA.
My previous message must not be taken into account.
sorry
Pierre Kestener.
Pierre Kestener wrote:
> Hello,
>
> I have noticed a strange behavior regarding NFS on my target
> (Virtex2pro ff1152 from Memec) when increasing OPB/PLB bus frequency
> from 50 MHz to 66.666667MHz to be able to use a 100 Mbs ethernet link
> (it is mentionned in the OPB/EMAC IP doc
> that Bus clock should be more than 65 MHz to have 100Mbs).
>
> I use U-boot (ML300 port with small modifications) for the bootloader
> step (download linux kernel via tftp) and kernel 2.4.20. The root
> filesytem is mounted via NFS.
>
> At 50MHz, everything works fine. Ethernet link speed is 10 Mbs. I can
> check that on my Ethernet switch.
>
> When using 66.666667MHz OPB frequency, ethernet Link speed is indeed
> 100Mbs. U-boot works perfectly but linux boot fails trying to get nfs
> server port !!!
>
> Using "tcpdump" on my linux host, i can see that target sends ARP
> packets and the server replies but nothing happends...
>
> 09:04:28.848228 arp who-has myHost.extra.cea.fr tell 132.166.xxx.yyy
> 09:04:28.848265 arp reply myHost.extra.cea.fr is-at 00:06:5b:xx:yy:zz
>
> Has anyone seen such a behavior, using a 100Mbs ethernet link with a
> Virtex2pro target ?
> Any idea regarding this problem (hardware or software) ?
>
> Thanks a lost.
> Best Regards.
>
> Pierre Kestener.
>
--
+-------------------------------------------+
CEA Saclay -- DSM/DAPNIA/SEDI
91191 Gif-sur-Yvette - FRANCE
tel : +33 (0)1 69 08 57 09
http://pierre.kestener.free.fr/
+-------------------------------------------+
prev parent reply other threads:[~2005-04-21 15:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-20 9:46 Virtex2pro OPB frequency 10/100Mbs ethernet link related problem Pierre Kestener
2005-04-21 15:17 ` Pierre Kestener [this message]
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=4267C424.7000700@cea.fr \
--to=pierre.kestener@cea.fr \
--cc=linuxppc-embedded@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).