[U-Boot-Users] usbserial.c for 2.4.20-8smp

Hi; With reference to the mail archive http://sourceforge.net/mailarchive/message.php?msg_id=9819913, I would like to know where can I donwload usbserial.c for my Redhat 9.0 (2.4.20-8smp) for my linux host in order to run usb console properly. There is this reference in the mail PET/src/os/linux/drivers/isb/serial/usbserial.c but I don't know where does this PET refer to. Any pointer is appreciated. Thanks.

Regards, TEH