All - Freescale crowd,
Carefully reading the manual it becomes evident, though not obvious that current U-boot UEC driver would crash with any 10BaseT hub connected.
I.e. any RGMII connection with Half Duplex, which the current UEC driver readily will set, is an illegal mode in the MPC83xx chipsets. At least the MPC836xx chips.
You'll get TX FIFO errors, followed by no TX Buffers ready, as the QE just locks up.
My main concern is that how does one make the PHY switch modes without implementing some kind of crude reset of the entire driver? I.e. the PHY has to change interface mode from RGMII to something else that can support half duplex, as well as the MAC inside the MPC83xx has to change modes to something other than RGMII that can support half duplex.
Currently there is no code path to drive anything other than RGMII. Anyone got suggestions? My beta code for a national GigE part, simply calls a function similar to the Marvell change_phy_interface() seems to cause the QE to never get a lock with the PHY device, and thus nothing is ever established. Not sure if the QE is losing sync with the PHY or the PHY is blowing up due to a change of interface type on the fly.
Kim???
-Russ