[Libreboot] Libreboot with SeaBIOS

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Hi,

Is there any place where can I download already compilled libreboot for 
T500 with SeaBios payload instead GRUB?

I found Francis Rowe's post: " SeaBIOS isn't integrated in the master 
repo. Use the "nully" branch,
though do note that it's out of date; you'll need to rebase it."

Could anybody provide some more detailed info?

thanks