[U-Boot-Users] u-boot 1.1.1 & Intel LXT972A

VanBaren, Gerald (AGRE) Gerald.VanBaren at smiths-aerospace.com
Tue Jul 20 20:55:49 CEST 2004

> -----Original Message-----
> From: u-boot-users-admin at lists.sourceforge.net
> [mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of
> Knowledge
> Seeker
> Sent: Tuesday, July 20, 2004 2:40 PM
> To: U-Boot List
> Subject: [U-Boot-Users] u-boot 1.1.1 & Intel LXT972A
> I have LXT972A on 852T. From u-boot, I have set mac, ip and netmask.
> When I try to ping a ip address on LAN. I get "TX timeout"
> I have traced this. During u-boot init, fec_initialize is called,
> which does not do much to comfiugre the hardware. When I ping fec_init
> is called in cpu/mpc8xx/fec.c and then it eventually times out in
> fec_send function.
> I have ether real running on another computer, which can see arp
> packet coming out of fec.
> So at this point what should I look next.
> Help. Completely lost.

I understand you are pinging _from_ u-boot.  If not, that is a problem.

Do you see ARP replies from your ping target?  If not, you have a problem with either the target machine or the ARP packet itself (most likely the former: ethereal should tell you about packet problems).

Is the FEC interrupt happening?  Do you see packets in the FEC Rx queue?

If you are seeing ARP replies on the network, you have a ethernet receive problem.  Based on others similar questions in the archives, most likely you don't have the Rx clocking configured properly.  You might not have the port pins used by the ethernet Rx functions configured properly.  You might not have the PHY configured correctly. 


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