[zd1211-devs] Information about how to load drivers in Linux kernels

[Javier G. C. <jav...@tu...>]

Hi everybody,

I am very new at Linux and embedded systems. I have ported a 2.6.20 =20
linux kernel with a provided ext2 file system (uClibc 0.9.28 and =20
Busybox v1.1.2) to the board AT91RM9200-EK.

I want to add a wireless extension to the system with an USB Wi-Fi =20
device based on the chipset zd1211. For this purpose, I enabled all =20
the following options in the kernel confiduration as modules: IEEE =20
802.11, radio, zd1211 drivers etc.

When I used the modules commands of my Busybox installed version I had =20
problems loading these modules (I included all .ko files in the file =20
system after compiling) . Then I decided to download a new version of =20
Busybox and compile it with the appropiate configuration for the =20
modules tools. However, the new compiled version didn't work and my =20
file system couldn't be booted.

Finally, I have enabled all these options not as modules, but built in =20
the kernel itself.

Then I would like to ask if there is something else necessary to do =20
for loading the driver of this device successfully or if it is already =20
done following this procedure.

What disadvantages does this procedure of loading drivers in the =20
kernel have? Will I find any problem later?

when I recompile the kernel with all modules built inside and I =20
connect the USB  device to my target, I obtain the following error:

[root@(none) /]# usb 1-1: new full speed USB device using at91_ohci =20
and address 2
usb 1-1: configuration #1 chosen from 1 choice
usb 1-1: Could not load firmware file zd1211/zd1211b_ub. Error number -2
zd1211rw 1-1:1.0: couldn't load firmware. Error number -2
usb 1-1: reset full speed USB device using at91_ohci and address 2
zd1211rw: probe of 1-1:1.0 failed with error -2
usb 1-1: device_add(1-1:1.0) --> -2

Thanks in advance,

Javier