From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed,  6 Feb 2008 12:54:16 +0100
From: Kernel Panic <cinap_lenrek@gmx.de>
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To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] 9pcf debugging
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Llu=C3=ADs Batlle wrote:

>Thank you all...
>In fact I managed to get the ethernet driver working at the first code
>change I tried today!
>This means that by now I won't try to debug the kernel, but I really
>like to have known of these kernel debugging techniques.
>
>Btw, I had problems with the Rhine ethernet driver. I got much help
>from #plan9... the driver wanted to align some structures to the cache
>line size. The driver read the cls from the pci configuration space,
>and my card had that register *bad* (0x04 instead of 0x08, for the x86
>architecture I use).
>As the driver allocates several Ds structures with a big malloc, and
>dividing the allocated area to (p+=3Dcls) parts, each for each Ds
>structure, the driver required that cls >=3D sizeof Ds. That wasn't met
>in my system, and the driver decided not to load.
>I simply set manually the alignement to 32 bytes (0x08 dwords,
>according to pci cls terminology), and it worked well for several
>minutes, until I had to turn off the system.
>
>Yesterday I tried aligning to 64 bytes, which I thought should work,
>but it only worked for some tens of packets, and then the card
>'hanged'. I cannot describe that hang better than the simple user
>experience of no network packet receiving any answer, since some pings
>worked and I could mount sources.
> =20
>
My VIA C7 based machine has the same problem:

0.18.0:	net  02.00.00 1106/3065  10 0:0000f001 256 1:fdffe000 256
	VIA Technology VT6102 Rhine II PCI Fast Ethernet Controller

so i could help you testing that thing :-)


cinap