On Tue, 6 Mar 2007 12:03:57 +0100 Cedric Pontois wrote: > Hi Vitaly, > > The problem seems to be similar in recent kernels > (/drivers/net/fs_enet/mac-fcc.c). The transmit clock is inverted (TCI > bit set). The packets are well received, transmitted packets go out > (tx counter is ok), unfortunately as the clock is inverted (TCI) the > data are not correctly received by the other side. The FCC works in > 100Mbps (luck?) but doesn't in 10Mbps. I solved this problem by > removing the TCI bit set as described in the patch. Actually, this > problem depends also of the Ethernet phy used on board. > IIRC it worked for us with Davicom PHY on 10 MBps on one of 8260-like... Well I give it a try once more with the recent kernel, but anyway if you think you've located and fixed root cause, do (and test) a patch against recent kernel, send it to me cc'ing netdev and linuxppc-embedded, and I'll push it along if it is not breaking existing boards.
-Vitaly > Cedric > > -----Original Message----- > From: Vitaly Bordug [mailto:[EMAIL PROTECTED] > Sent: mardi 6 mars 2007 10:42 > To: Li Yang-r58472 > Cc: Pontois, Cedric UMTS (CEZ:8Z10); [EMAIL PROTECTED]; > linux-kernel@vger.kernel.org; linuxppc-embedded@ozlabs.org > Subject: Re: [patch 1/1] ppc: Possible bug fix for FCC driver > > > On Tue, 6 Mar 2007 10:23:43 +0800 > Li Yang-r58472 wrote: > > > Hi Cedric, > > > > For ppc embedded related patches, please also cc: > > [EMAIL PROTECTED] > > > > > We use a kernel 2.6.14 on PPC platform (MPC 8555). The FCC driver > > works > > > > To submit a kernel patch upstream, the patch should be against the > > latest kernel version which is 2.6.21-rc now. > > > well with a 100Mbps link. But it doesn't with a 10Mbps link. To > > > solve it, I modified the GFMR register init: removed TCI bit and > > > set > > > > CRC32 > > bit > > > instead of. > > > > I don't know how these bits caused the 10M link issue. Do you have > > any reasoning? > > > > > Signed-off-by: Cedric Pontois <[EMAIL PROTECTED]> > > > > > > > > ---------------------------------------------------------------------- > > -- > > > ----- > > > > > > diff -ruN pa-original/arch/ppc/8260_io/fcc_enet.c > The fcc code in 8260_io has been obsoleted by fs_enet driver > (drivers/net/fs_enet). It is known to work with 85xx at least in > recent kernels. If it does not for some reason, please letus know. > > Thanks, > > -Vitaly - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/