From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cirse.extra.cea.fr (cirse.extra.cea.fr [132.166.172.102]) by ozlabs.org (Postfix) with ESMTP id 52B0C67A67 for ; Fri, 22 Apr 2005 01:18:04 +1000 (EST) Received: from argiope.saclay.cea.fr (argiope.saclay.cea.fr [132.166.192.108]) by cirse.extra.cea.fr (8.12.10/8.12.10/CEAnet-Internet.4.0) with ESMTP id j3LFI1AN000183 for ; Thu, 21 Apr 2005 17:18:01 +0200 (MEST) Received: from pisaure.intra.cea.fr (unverified) by argiope.saclay.cea.fr (Content Technologies SMTPRS 4.3.17) with ESMTP id for ; Thu, 21 Apr 2005 17:18:01 +0200 Received: from muguet.saclay.cea.fr (muguet.saclay.cea.fr [132.166.192.6]) by pisaure.intra.cea.fr (8.12.11/8.12.11) with ESMTP id j3LFGqNU008463 for ; Thu, 21 Apr 2005 17:16:53 +0200 (envelope-from pierre.kestener@cea.fr) Message-ID: <4267C424.7000700@cea.fr> Date: Thu, 21 Apr 2005 17:17:56 +0200 From: Pierre Kestener MIME-Version: 1.0 To: Pierre Kestener References: <42662502.5060108@cea.fr> In-Reply-To: <42662502.5060108@cea.fr> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linuxppc-embedded@ozlabs.org Subject: Re: Virtex2pro OPB frequency 10/100Mbs ethernet link related problem List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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/ +-------------------------------------------+