[coreboot] Converting epia-n build to SeaBIOS

Kevin O'Connor kevin at koconnor.net
Fri Aug 21 04:32:46 CEST 2009

On Thu, Aug 20, 2009 at 02:06:07PM +0200, Stefan Reinauer wrote:
> Harrison, Jon (SELEX GALILEO, UK) schrieb:
>> 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.

I believe it is possible to add USB keyboard support to SeaBIOS
without requiring SMM mode.  I believe a regular usb keyboard driver
will work fine.

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

Very true.


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