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 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
