K 10
svn:author
V 8
rdivacky
K 8
svn:date
V 27
2011-04-04T18:23:55.990298Z
K 7
svn:log
V 400
Build boot2 with -mregparm=3, ie. pass upto 3 arguments via registers.
This modifies CFLAGS and tweaks sio.S to use the new calling convention.
The sio_init() and sio_putc() prototypes are modified so that other
users of this code know the correct calling convention.

This makes the code smaller when compiled with clang.

Reviewed by:    jhb
Tested by:      me and Freddie Cash <fjwcash gmail com>

END