At the current stage, the USB HID and storage drivers are prinicpally
working but not stable. If interrupts are not processed fast enough,
devices will get sporadically disconnected.
The USB host-controller driver is not part of the normal Linux kernel.
For this reason, we need to download it separately. There exists a
'prepare_rpi' rule in the 'dde_linux/Makefile' to automate this process.
'alloc_skb' might now fail, the Nic component will then send a 'packet
available' signal and return. Fix broken SKB list implementation as well as
completely bogus initialization of SKBs.
Related to #778.
This fixes issues with several HID keyboards by implementing
get_unaligned_le16(), which obviously may also fix other not-yet-known
issues. Hint: I had to look out for suspicious lines like follows in the
verbose log.
[init -> usb_drv] get_unaligned_le16 called, not implemented
Also, quirks for cherry keyboards are now applied.
Sebastian Sumpf
Norman Feske
Christian Prochaska
Christian Helmuth
Alexander Boettcher