DSL Ideas and Suggestions :: Drivers for broadcom 57xx
The new Dell's are coming with this card as well.
I found the source from broadcom for their linux driver here. It was easy to compile them, you just need the gcc1.dsl and the kernelsource.dsl files loaded. Unzip the package (you need to use windows as dsl bombed there) then untar the bcm5700-7.3.5.tar.gz file. Go to the src directory and type make. Then sudo insmod bcm5700.o and you're a pppoe away from using the connection. I was having a problem with my new work computer and I found those drivers.
Because the /lib/modules/..... files are linked to the /KNOPPIX on the CD, you need to make copies of the files that give you file locked error and replace the symbolic links with them if you try to run make install.
The whole thing is about 116K as a compressed dsl, with a menu item to load the driver, which I'm sending in now.
For what it's worth, Knoppix V3.7-2004-12-08-en ran my card just fine without any setup.
original here.