On Fri, 2011-04-08 at 13:22 -0500, Ayman El-Khashab wrote: > From: Ayman El-Khashab <ay...@elkhashab.com> > > This patch is to fix the PCIe on the 460SX CPU. As far as I can tell, > the 460SX must be using a different core than the previous 4xx SOCs. > The registers aren't the same and it appears DCRs that existed on > previous parts don't exist on this one. Perhaps somebody from AMCC > can chime in. In any case, the main problem was that the TX and RX > weren't enabled so nothing downstream from the RP was ever found. > And the check to set "port->link" would never work (as far as I could > tell). I could not find any DCRs in this part to indicate when the > link was up and there isn't an obvious loopback, so the following > call would fail and result in no devices found. > > ppc4xx_pciex_wait_on_sdr(port, PESDRn_LOOP, 1 << 28, 1 << 28, 100) > > It would be better to detect the link status, but I don't see an > obvious way to do that from the data sheet. U-boot just skips the > link check as well for this part.
Hi Tirumala ! You originally submitted the support for 460ex. Can you chime in (and review Ayman patch) please ? Cheers, Ben. > > Ayman El-Khashab (1): > ppc4xx: Fix PCIe scanning for the 460SX > > arch/powerpc/sysdev/ppc4xx_pci.c | 35 +++++++++++++++++++++++++++++++---- > 1 files changed, 31 insertions(+), 4 deletions(-) > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
