Re: [LinuxBIOS] [PATCH] Fix various compiler warnings and potential bugs

[Segher Boessenkool]

> Prepare for more explosions. The POST code is written 32768 times and
> a side effect of writing to an I/O port on x86 is that it takes ~3  
> usec
> depending on whom you ask. Why writing the POST code, you ask? Simple.
> Port 0x80 is probably the one I/O port with the least side effects.

There's also 0xeb, which is guaranteed to be empty (which makes
it even slower, at least on actual ISA systems).

Segher