>Thats different. You end up needing some mappings for kernel and
user
>space to be efficient when dealing with user mappings. Whether you can
>get your .5Gb back depends if the chipset can remap it higher up in memory
>so that the 3.5-4Gb RAM masked by PCI is remapped at the top of memory.
Know which ones, if any, currently can? AMD, Nvidia, or VIA?
I don't
Why would they release a chip that couldn't?
I've no idea how complex it is to do that so I can't guess