Hi,
I'm struggeling with an Ethernet driver on the FEC of a MPC860-T. To
the best of my knowledge, I'm doing everything strictly as
documented, and as other drivers do it. However, even when I just
want to send a single packet (no interrrupts, everything as simple as
possible), the package is sent 3 times to the wire; sometimes even 4
times. I don't see any indication of this in the software, just 3
packets on the wire, usually 5...9 us apart (on a 100 Mbps net; the
packets come after 300...320 us on a 10 Mbps net).
Playing with half or full duplex mode didn't change anything. In case
it matters: it's a LXT972LC PHY. Ummm.. and yes, I can be sure the
hardware is working OK. It does so in another OS...
Any ideas what I am missing?
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
Imagination is more important than knowledge. -- Albert Einstein
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
Hi,
I experienced the same behaviour when I had initialized the FEC to
use only 1 transmit BD (it was a simple application and I only needed 1
transmit buffer). I modified the code to use 2 transmit BD's and the
problem went away. If you are using only a single transmit BD, try
increasing it to 2.
Tom Armistead
Wolfgang Denk wrote:
Hi,
I'm struggeling with an Ethernet driver on the FEC of a MPC860-T. To
the best of my knowledge, I'm doing everything strictly as
documented, and as other drivers do it. However, even when I just
want to send a single packet (no interrrupts, everything as simple as
possible), the package is sent 3 times to the wire; sometimes even 4
times. I don't see any indication of this in the software, just 3
packets on the wire, usually 5...9 us apart (on a 100 Mbps net; the
packets come after 300...320 us on a 10 Mbps net).
Playing with half or full duplex mode didn't change anything. In case
it matters: it's a LXT972LC PHY. Ummm.. and yes, I can be sure the
hardware is working OK. It does so in another OS...
Any ideas what I am missing?
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
Imagination is more important than knowledge. -- Albert Einstein
--
Tom Armistead
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/