[SeaBIOS] 5 basic features provided by CSM, which SeaBIOS does provide?

[Kevin O'Connor]

On Fri, Dec 18, 2015 at 08:43:37AM +0000, Stojsavljevic, Zoran wrote:
> Hello both lists, Jiming,
> 
> There are 5 basic features, provided by CSM SeaBIOS payload, and I
> am looking to list of these features.
> 
> Could you, please, provide to me list of these features, and some
> description, and/or pointer to these descriptions?

I don't fully understand your question.  One can build SeaBIOS as a
Compatibility Support Module (CSM) for UEFI, and this has been tested
with OVMF on virtual machines.  It's theoretically also possible to
use it as a CSM on real hardware with a UEFI payload on coreboot, but
to the best of my knowledge that has never been tested.  When SeaBIOS
is used as a CSM module, it provides legacy 16bit BIOS support on UEFI
machines to bootloaders and option roms that require that support.

The only link I have for SeaBIOS CSM is:

  http://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Support_Module_.28CSM.29

Cheers,
-Kevin