ons 2009-01-07 klockan 07:52 -0500 skrev Jerry Van Baren: > Wolfgang Denk wrote: > > Dear Ulf Samuelsson, > > > > In message <1231282371.32308.276.ca...@elrond.atmel.com> you wrote: > >> It was tracked down to the autoconfiguration of the > >> Ethernet PHY, so one of the PHYs ended up in > >> 100 Mbps Half Duplex (think that was the switch) > >> while the other PHY ended up in 100 MBps Full Duplex. > > > > That would most probably be a bug in the U-Boot ethernet driver, then. > > > > Best regards, > > > > Wolfgang Denk > > If auto-negotiation fails, the default is half duplex (10 or 100 - the > speed can be discovered independent of the autonegotiation by the encoding). > > Ulf's recollection that the switch was half duplex would indicate that > the cheap switch did not autonegotiate properly, but u-boot did. This > could be a u-boot bug (not setting up the negotiation properly), but > more likely would be a switch problem (not handling the u-boot auto-neg > options properly). >
Don't remember all details, since it was 4 years ago. I talked to D-Link support and they claimed that the standard was to fall back to one of the options, if autonegotiation failed. The customer might have had a PHY without autonegotation which was hardwired to 100 Mbps full duplex. With little communication, the packages were sent where this caused some problems. > gvb > > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > http://lists.denx.de/mailman/listinfo/u-boot _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
