[OLPC-devel] Thoughts on S3 resume.

[Ronald G Minnich]

Matthew Garrett wrote:

> The one real question I have is "Who puts the CPU back in protected 
> mode". In ACPI, that's the kernel. In theory, in our case we could do it 
> in the BIOS. I don't think there's any performance reason to prefer one 
> over the other, and doing it in the kernel means we can use the existing 
> wakeup code without any modification.
> 


do you mean protected mode or paging enabled? Linuxbios goes into 
protected in the first 10 instructions or so. If it is an s3 restart, 
then linuxbios can pop out to real mode and call the kernel if needed.

I clearly need to learn more about S3 mode and linux, so that goes on my 
list.

thanks, your note was very informative!

ron