[coreboot] Converting epia-n build to SeaBIOS

Stefan Reinauer stepan at coresystems.de
Thu Aug 20 14:06:07 CEST 2009

Harrison, Jon (SELEX GALILEO, UK) schrieb:
> OK. So I seem to have got my build deploying seaBIOS (0.4.1) , but
> appear to have hit a major obstacle.
> No USB Keyboard Support!? This is a complete show stopper for me.
> I've seen a thread from last summer talking about adding USB Kbd
> support::
> http://www.coreboot.org/pipermail/coreboot/2008-December/043714.html
> Has anything happened anywhere on this ??
> I'm now trying to decide whether I fancy my chances of adding CBFS
> support to FILO or USB keyboard to SeaBIOS more !!!
USB keyboard support for SeaBIOS will require that you emulate a 
standard PS/2 keyboard (io 0x60/0x62)  interface in system management 
mode (SMM), passing the commands on to a USB stack (There is one in 
libpayload which should probably be used. It's the stack that is used in 
FILO for USB keyboard support, too). Right now there is only a SMM 
handler for i945/i82801gx, and it has no USB keyboard legacy emulation, 
but it can show you quite well what needs to be done to implement an SMM 
handler for a coreboot platform.

CBFS support in FILO (or libpayload, for that matter) is definitely the 
quicker approach.


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