Now a signed bootloader has its uses, however in a properly designed
system you would allow the user to import their own keys.
The problem with this scheme is that a "trusted" os would in theory,
with the users permission be able to some how update the trusted key
repository on the firmware. Which means the security of your machine is
as good as the security of your firmware / the OS that is "trusted" to
update the keys. Given certain operating systems weak security record in
the past, I would say that doing this would sadly amount to proving no
security benefit at all ;)
--
Sincerely,
William Brown
pgp.mit.edu
http://pgp.mit.edu:11371/pks/lookup?op=vindex&search=0x3C0AC6DAB2F928A2