-----Original Message----- From: Jon Smirl [mailto:jonsm...@gmail.com] Sent: Wednesday, May 20, 2009 11:15 To: Eric Millbrandt Cc: Wolfram Sang; Grant Likely; linuxppc-dev@ozlabs.org Subject: Re: mpc5200 fec error
On Wed, May 20, 2009 at 9:42 AM, Eric Millbrandt <emillbra...@dekaresearch.com> wrote: >> > I am able to reproduce the error using 2.6.29.2-rt11. I was able to >> > mitigate the problem by raising the priority of the transmit irq. >> > However when running an NFS server on the pcm030 under high cpu load I >> > now get >> > >> > [ 132.477503] net eth0: FEC_IEVENT_RFIFO_ERROR >> > [ 132.892329] net eth0: FEC_IEVENT_RFIFO_ERROR >> > [ 133.884109] net eth0: FEC_IEVENT_RFIFO_ERROR >> > [ 134.876059] net eth0: FEC_IEVENT_RFIFO_ERROR >> > >> > Raising the priority of the rx irq does not seem to fix this problem >> > though. >> >> Hi Eric, >> >> This error has been seen before in non-rt kernels. I haven't had the >> chance to track it down and kill it yet. I believe there are locking >> issues associated with it. > > Uuuh, I recall this message. Kept me busy for some time :( > > You might try this patch which helped in our situation. > > =========== > > Subject: Enable XLB pipelining for MPC5200B > From: Wolfram Sang <w.s...@pengutronix.de> > > Enable pipelining as it helps getting rid of FEC problems. > Not intended for upstream, this must be dealt differently there. > > This patch is disabled by default. The bootloader should enable this feature. > So, this patch is only intended to be used where the bootloader does it in a > wrong manner and can't be replaced. > > Signed-off-by: Wolfram Sang <w.s...@pengutronix.de> > Acked-by: Juergen Beisert <j.beis...@pengutronix.de> > > --- > arch/powerpc/platforms/52xx/mpc52xx_common.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > Index: arch/powerpc/platforms/52xx/mpc52xx_common.c > =================================================================== > --- arch/powerpc/platforms/52xx/mpc52xx_common.c.orig > +++ arch/powerpc/platforms/52xx/mpc52xx_common.c > @@ -107,6 +107,13 @@ mpc5200_setup_xlb_arbiter(void) > */ > if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR) > out_be32(&xlb->config, in_be32(&xlb->config) | > MPC52xx_XLB_CFG_PLDIS); > +#if 0 > + /* > + * Enable pipelining, fixes FEC problems. The previous workaround is > not > + * needed, as we have an MPC5200B (not A). > + */ > + out_be32(&xlb->config, in_be32(&xlb->config) & > ~MPC52xx_XLB_CFG_PLDIS); > +#endif > > iounmap(xlb); > } > > -- > Pengutronix e.K. | Wolfram Sang | > Industrial Linux Solutions | http://www.pengutronix.de/ | > > Wolfram, > > Thanks, but no luck with this patch. It was already setup correctly by > U-Boot. I don't see where this gets enabled in the u-boot source. Have you added it locally? These are the only two I see: cpu/mpc5xxx/cpu_init.c: *(vu_long *)(MPC5XXX_XLBARB + 0x40) |= (1 << 13); cpu/mpc5xxx/cpu_init.c: *(vu_long *)(MPC5XXX_XLBARB + 0x40) |= (1 << 15); -- Jon Smirl jonsm...@gmail.com If you look a few more lines down you should see # if defined(CFG_XLB_PIPELINING) /* Enable piplining */ *(vu_long *)(MPC5XXX_XLBARB + 0x40) &= ~(1 << 31); # endif I obtained the u-boot sources directly from phytec, for my phyCore, so I am not sure if they added it. _________________________________________________________________________________________ This e-mail and the information, including any attachments, it contains are intended to be a confidential communication only to the person or entity to whom it is addressed and may contain information that is privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender and destroy the original message. Thank you. Please consider the environment before printing this email. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
