[U-Boot-Users] USB keyboard is not working, contrary to USB stick

Hi, i'm working with u-boot 1.3.1 I can upload my software thanks to a USB stick but when i want to connect a USB keyboard, nothing happens. I added #define CONFIG_USB_KEYBOARD and #define CFG_DEVICE_DEREGISTER in my configuration header.

when i modified code, i succeded in switching on the Caps lock's led but that 's all. I'm working with the STI7100 cpu, i'm using a debugger but the software never goes to the usb_kbd_irq function.

The keyboard is really installed, it's a default one, i already tried an other one but i had the same results.

thanks for your help