According Debian Wiki  I have my keyboard again, in terminal, with :
If the configuration above was not set to include most modules then the necessary modules have to be specified in the file /etc/initramfs-tools/modules:
# USB keyboard at boot
# update-initramfs -u
Now the problem is my initrd which is not found.
May be the sd/mmc driver ?
What are the needed driver for initrd / modules generated in cross chroot ?