Re: new laptop woes

From: Helge Hafting
Date: Wed May 12 2004 - 02:14:08 EST

jnf wrote:

Hash: SHA1


The other night, I did something I know better than to do- and this is buy a piece of hardware before checking out the support it has in the linux/unix world. But overall I came out ok. I have a few comments and questions and I will try to present them in a coherant fasion below.

1) broadcom wlan cards

As I understand it, broadcom has more or less refused to release alot/some of the specs for some of their cards. I've done some kernel programing, I wrote something that could be somewhat classified as a virtual driver in the network stack I suppose- but I've never written a 'real' driver. So in short, beyond digging through some of the other wlan drivers and getting an idea for where to start- if I wanted to attempt to write a driver for this, what would be a good place to start? (I'm not even totally sure how to interface with it, it doesnt appear that its even being assigned an irq- but i could be wrong)

Looking at other card drivers, you'll find out what a driver look like.
You'll learn how a card driver interfaces to the kernel.
To write a driver for this card you _need_ to know how that particular
card is programmed. (What io adresses do it use, what do they mean,
what are the timing requirements, and so on.)
Looking at other drivers won't help you with that, unless one of the
other drivers happens to use the same chips. This information is in the
specs that broadcom so far haven't released. Of course you can
write to broadcom, perhaps they'll inform you when they see you
are serious about this.

The card is not assigned an irq precicely because it has no driver.
IRQ's aren't handed out because devices exists - they are handed
out because device drivers request them from the kernel.

Helge Hafting

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