parisc: Add -fw_cfg opt/OS64,string=1 option

This option is only relevant when booting a 64-bit machine and the value
defaults to enabled (1).

When OS64 is set to 0, the firmware will tell the OS that 64-bit
firmware calls are not supported.

Effectively, this prevents the OS to install a 64-bit OS (on the 64-bit
machine).

Signed-off-by: Helge Deller <deller@gmx.de>
1 file changed