debugging network device driver

[Tesch Zoltan]

Hi,

Thanx a lot, I will try it

Zoltan

-- Eredeti üzenet --
Feladó: Pyun YongHyeon <pyunyh at gmail.com>
Címzett: Tesch Zoltan <clamav at citromail.hu>
Elküldve: 01:49
Téma: Re: debugging network device driver

On Sun, Feb 22, 2009 at 09:00:29AM +0100, Tesch Zoltan wrote:

> Hi,

> 

> I have just tried to port SiS190 Linux driver to FreebBSD. It seems to

> me that this driver looks like r8169 and for this reason my port is

> based on the "re" device driver of FreeBSD 6.4.



Hmm, I have no idea why SiS190 is similar to RTL8169. Both

controllers have small set of registers though.



> I can load the module, attach to SiS190 device, miibus and phy but when

> I try to set up the interface with ifconfig (ifconfig sis0 up) the

> computer freezes. I have tried to print status information from my

> driver (using printf`s in the code) but the last record in the log is

> that miibus_readreg returned a good value, no other record is logged

> into the system log.

> 



It's hard to say what was wrong here. Datasheet is not available

to open source developers and the controller seem to have severe

alignment restrictions as well as lack of auto-padding.



> My questions:

> Is there any way to switch to kernel debug mode in this situation to see

> what happened or is it possible to run  the module under the supervision

> of kernel debugger running on the machine, because this laptop has no

> serial line or any other network interface.

> 



ktr(4) is much better than printfs. Btw there was a post for

SiS190 driver so you can reference his work.

http://lists.freebsd.org/pipermail/freebsd-drivers/2008-April/000685.html



Having a wired/wireless USB network controller would make your

life easier.