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Re: AMD Au1100 problems (USB & Ethernet)

To: Sylvain Munaut <tnt@246tNt.com>
Subject: Re: AMD Au1100 problems (USB & Ethernet)
From: Pete Popov <ppopov@embeddedalley.com>
Date: Fri, 05 Aug 2005 12:47:32 -0700
Cc: "'linux-mips@linux-mips.org'" <linux-mips@linux-mips.org>
In-reply-to: <42F3C05E.7060002@246tNt.com>
Organization: Embedded Alley Solutions, Inc
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <42F3C05E.7060002@246tNt.com>
Reply-to: ppopov@embeddedalley.com
Sender: linux-mips-bounce@linux-mips.org
I'm guessing the ethernet problems are hardware/board related. Take a
look at the PHY and make sure it's working OK.

Pete


On Fri, 2005-08-05 at 21:39 +0200, Sylvain Munaut wrote:
> 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
> 
> 
> 
> 


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