After booting up, and ssh'ing from other machine I discovered that 2.6.18 (one with working keyboard) has two additional modules loaded: usbcore and ohci_hcd.
In config-2.6.21-1-powerpc those modules are marked as "Y", so I guess this is not a problem here. I was trying manually loading and unloading every module from drivers/input, but it doesn't help Usb keyboard doesn't work, but after connecting it there is some response in kernel.log : usb 3-1: new low speed USB device using ohci_hcd and address 7 : usb 3-1: configuration #1 chosen from 1 choice : input: HID 046a:0013 as /class/input/input3 : input: USB HID v1.10 Keyboard [HID 046a:0013] on usb-0001:10:1b.1-1 : input: HID 046a:0013 as /class/input/input4 : input: USB HID v1.10 Device [HID 046a:0013] on usb-0001:10:1b.1-1 other usb-devices like mp3-player are working correctly on this kernel. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]