look at TCP/IP Illustrated vol. 2 by Richard Stevens.
It contains examples of lance and slip drivers.
it walks you through the code -but is a bit dated (as
far as netbsd is concerned).
regards
-kamal


--- rasputin@doru.mine.nu wrote:
> 
> This is a bit of a long shot, but is there a
> document anywhere 
> that explains  how a driver is constructed?
> 
> In particular, I'm trying to understand how the eap
> driver works on i386,
> with a mind to adding a new codec (using FreeBSD's
> pcm(4) as a reference,
> although their driver isn't designed the same way).
> 
> Trouble is I'm finding it hard to follow the source
> alone - it's quite
> difficult to see where the codecs are defined for
> example
> (I stress this is PEBKAC, not a problem with the
> NetBSD source; C-wise,
> I'm just past the 'teach yourself XX in 24 hours'
> level).
> 
> I'd rather have a crack at hacking it myself than
> buy a new card,
> plus I've needed an excuse to look into the kernel
> source for ages...
>  - just thought I'd aks if there were any useful
> docs I should know about,
> and figured you guys must've learnt somewhere....
>  
>  Google seemed to draw a blank, so thought I'd ask
> here.
> 
> -- 
> Rasputin :: Jack of All Trades - Master of Nuns


__________________________________________________
Do You Yahoo!?
Yahoo! - Official partner of 2002 FIFA World Cup
http://fifaworldcup.yahoo.com