No idea on USB, but...
Jenny_Hopkins@toby-churchill.com sez:
Then the PCMCIA problem: Can I simply copy the /lib/modules/2.2.20/pcmcia directory to /lib/modules/2.4.19/pcmcia in order to try and get my pc card working in 2.4.19 as well as 2.2.20, or does it not work like that doe to the way the kernels handle modules? I'm anxious *not* to blow anything up!
No, the chances are very high that won't work. insmod will refuse to install the module; there's the evil way of insmod -f but you'll almost certainly get a bunch of undefined symbol errors if you try the. Just compile the same drivers under 2.4.19 and it'll work as well as before.
Jenny.
lewis