[U-Boot-Users] PPC4xx enet crossover
I'm using a PPC440EPx with a Marvell PHY (same as on Sequoia). If I connect to a PC with a crossover Ethernet cable, U-Boot sees a link but the PC does not. The PC (running Linux) reports "Autonegotiation failed (remote fault)" and ethtool reports no link.
However if I let the PowerPC boot up into Linux, all of a sudden the PC sees link and pings start working. In fact, it works in Linux with a standard Ethernet cable, too (gigabit ports should be autosensing).
It seems U-Boot is not initializing the PHY correctly to handle a direct connection, but Linux is... any ideas? Everything works fine through a switch.
Thanks, Mike
On Monday 03 March 2008, Mike Nuss wrote:
I'm using a PPC440EPx with a Marvell PHY (same as on Sequoia). If I connect to a PC with a crossover Ethernet cable, U-Boot sees a link but the PC does not. The PC (running Linux) reports "Autonegotiation failed (remote fault)" and ethtool reports no link.
Did you really try to communicate with the PC in this situation? Please note that the PHY is only initialized upon ethernet usage. So if you just turn on the Sequoia and stop on the U-Boot prompt, no real PHY configuration will happen.
However if I let the PowerPC boot up into Linux, all of a sudden the PC sees link and pings start working. In fact, it works in Linux with a standard Ethernet cable, too (gigabit ports should be autosensing).
Understood. You should not need a crossover cable, since the PHY supports automatic MDI/MDIX crossover at all speeds of operation.
Best regards, Stefan
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participants (2)
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Mike Nuss -
Stefan Roese