Short version: Can anyone confirm 10Mb Ethernet works with fs_enet/mac-fcc? with RMII? with a KS8721 PHY?
Long version: I have an MPC8247 connected via an externally clocked RMII to a Micrel KS8721 PHY using the Generic PHY driver, running either MontaVista 2.6.18+ or mainline 2.6.30 (I don't see any relevant changes up to current mainline). 100Mb Ethernet works fine. When I use a 10Mb hub (not switch), the PHY registers, mii-tool, and ethtool all report 10baseT-HD, no autonegotiation. mac-fcc, restart() sets the FCC GFEMR CLK bit and clears the FCC FPSMR FDE and LPB bits (the FCC FPSMR RMII bit is set in all cases). >From that perspective, it looks like everything is set up correctly to work at 10Mb. However, no outgoing packets are received by other hosts and I see a 1:1 count of incoming errors for the ARP requests sent by my other host (frame errors, reported as RxBD[NO] nonoctet aligned errors). When I connect a scope to the transmit line, I'm seeing the same timing for both 10Mb and 100Mb. I would have expected the 10Mb to be 10x longer. The MPC8272 Reference Manual is confusing on this point, for the FCC GFEMR CLK field it says "RMII reference clock rate for 50-MHz input clock from external oscillator (Ethernet mode): 0 == 50MHz (for Fast Ethernet), 1 == 5MHz (for 10BaseT)" The RMII spec and the KS8721 datasheet both say REF_CLK should be 50MHz at all times, but I don't see anything other than the CLK bit to indicate 10Mb cycle timing for the RMII. Am I missing something? What next to try? Thanks, -- Ken _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
