Re: [coreboot] why is firmware 32 bit as opposed to 64 bit

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 10.08.2014 21:06, John de la Garza wrote:
> I understand that the calling functions in 32 bit C uses the stack and
> this is why coreboot needs to use cache as RAM.  Doesn't 64 bit C use
> registers to pass arguments to functions?  If this is the case why not
> run in 64 bit mode?
>
> Also, even if cache as RAM is used and a stack is available, why not just
> build a 64 bit binary?  What are the advantages to using a 32 bit binary?

long mode (64-bit) needs paging table in RAM. So no 64-bit for preram
binary. For rest it's theoretically possible but it's too much hassle
for no benefit.