AMD Au1100 problems (USB & Ethernet)

[Sylvain Munaut <tnt@246tNt.com>]

Hello,

I've been trying to adapt linux ( the HEAD CVS version ) to a
custom board based around a Au1100. To be more precise, the board
use a "cpu module" (CSB650 from Cogent
http://www.cogcomp.com/csb_csb650.htm ) that's placed on a custom PCB.


I've compiled and booted a kernel sucessfully, I see the message on the
serial console. It's in Big Endian mode since the boot loaded on the
card is big endian only and I could manage to get it to switch to little
endian ...

Now, let's go on with the problems :

 * About USB. First time I tried, it just hung but I quicly found out
that it was because I didn't route the 48Mhz clock to USB module. After
that, I had to slightly adapt the ohci bus glue to enable the OHCI big
endian mode. After that, when a USB stick is inserted, it gets detected,
I can mount it and read small files. But when I try to read bigger files
( just 1 or 2 MB ), I get stuff like :

[4294743.146000] usb 1-1: reset full speed USB device using au1xxx-ohci
and address 2

[4294743.618000] usb 1-1: reset full speed USB device using au1xxx-ohci
and address 2

[4294743.891000] usb 1-1: reset full speed USB device using au1xxx-ohci
and address 2

[4294744.151000] usb 1-1: reset full speed USB device using au1xxx-ohci
and address 2

[4294744.328000] au1xxx-ohci au1xxx-ohci.0: bad entry       4b


[4294744.346000] au1xxx-ohci au1xxx-ohci.0: bad entry ac450000


[4294744.363000] au1xxx-ohci au1xxx-ohci.0: bad entry 8f820014


[4294744.381000] au1xxx-ohci au1xxx-ohci.0: bad entry 38210001


[4294744.495000] hub 1-0:1.0: port 1 disabled by hub (EMI?),
re-enabling...

[4294744.515000] usb 1-1: USB disconnect, address 2


[4294745.532000] au1xxx-ohci au1xxx-ohci.0: IRQ INTR_SF lossage


[4294745.532000] usb 1-1: sg_complete, unlink --> -19


[4294745.532000] usb 1-1: sg_complete, unlink --> -19




Which means absolutly nothing to me ;( Has anyone got a clue ?
I can't say for sure it's not hardware but the cpu module is used by
others and on the base board, it's just a couple of differential pair
with 90ohm differential impedance, nothing more ...


 * About ethernet : It works, I have a network access. However I have
two kind of errors. On the RX side, I get quite a lot of "rx miss"
errors (when au1x00_eth debug is on). About 5% of packets are dropped.
That's not _too_ much of a problem as log as it doesn't increase. But
what can that be due too ?

A more annoying problem is that I get a lot of :
[  506.397000] NETDEV WATCHDOG: eth0: transmit timed out


[  506.412000] eth0: au1000_tx_timeout: dev=8048b400

theses are quite comment when  I transmitt a lot
                         and they completly ruin the transmission
(_real_ slow !).

Heres is some stats from ifconfig :

          RX packets:50496 errors:76 dropped:76 overruns:0 frame:0


          TX packets:49573 errors:47 dropped:0 overruns:0 carrier:74





Any insight / suggestion is appreciated, I'm getting desperate ;)


	Sylvain