Intel EM64T compatibility

[Marko Asplund <marko asplund kronodoc com>]

hi

we're developing an application that runs on Red Hat Enterprise Linux  
3.0 (x86) on IA-32 based CPUs. now a potential customer would be  
interested in running this application on an Intel EM64T and i'm  
trying figure out whether we can tell them they can run our  
application on a EM64T without any modifications.

how compatible is EM64T with IA-32? can i just install the RHEL 3.0  
(Update 4) for x86 on a EM64T machine? will it be 100% compatible  
with an IA-32 installation from the application perspective? is the  
processor required to run in legacy mode for 100% compatibility? how  
is legacy mode enabled exactly? can you run different applications in  
different modes or do you need to choose the mode at boot time?

br.
--
    aspa