Hi, I'm new!
I am porting u-boot to a custom board with a NP405H processor and an Intel LXT973 dual phy.
I have had a lot of success so far: I have brought the board up and can boot the kernel (without networking).
My network setup is different to the standard eval boards such as the IBM Ash board. I am using MII to talk to the phy with EMAC0 and 2, the ASH uses RMII. Currently I am only trying to support EMAC0 and ignore EMAC2.
So far, the only mod I have made to cpu/ppc4xx/405gp_enet.c is to add to the start of ppc_4xx_eth_init:
out32 (ZMII_FER, ZMII_MDI0 | ZMII_MII0 | ZMII_MII2); out32 (ZMII_SSR, 0x55550000);
(this is just before the "/* EMAC RESET */" comment). This should place my cpu into MII mode at the correct speed for my test network.
I can transmit bootp requests and I can send out ARP requests as part of a ping. I verified this using Ethereal on my Linux host.
My problem is reception. I see nothing! The receive LED blinks on the PHY and Ethereal shows DHCP_OFFER messages in response to the request or ARP messages in response to a ping.
Debugging using a Lauterbach (sorry, it's not a BDI2000!) shows that I never get a breakpoint on "enetInt" and therefore never receive any packets.
Unfortunately, I am fairly clueless when it comes to this chip and ethernet in general and hope that someone could point out some likely problems.
I have tested reception on the EMAC using some hardware test software written by a colleague, so I know that it CAN receive data. However, this program polls the EMAC rather than uses interrupts to receive data.
I suspect that using MII rather than RMII may be a clue, but don't know where to proceed.
Any help would be appreciated. Please excuse me if I've missed any obvious details.
Many thanks, Ryan Harkin.