Re: Suspend-to-RAM on Sony Vaios

[Andi Kleen <ak-l3A5Bk7waGM@public.gmane.org>]

On Wed, Nov 03, 2004 at 12:31:46PM +0100, ole.rohne-vJEk5272eHo@public.gmane.org wrote:
> Andi> Or rather not apply this. I have no plans to support switch back
> Andi> to real mode on x86-64. It is just far too hackish and fragile.
> 
> I agree that return to real mode is kind of *hackish* - but I do not
> agree that it has to be *fragile*. I'd like to repeat my general
> comments on the alternatives, not particularly connected to x86-64:

I very much doubt it you can get it reliable because it's such an 
extremly intrusive operation. 

> 
> Andi> Either do it before switching to protected/long mode or later
> Andi> in a emulator.
> 
> Properly supporting the "POST before switching to PM" would require a
> full real-mode bus/device resume. The ACPI specs doesn't even
> guarantee a working southbridge at real mode resume.

Not sure what you mean with "working southbridge". If you need 
PCI why not call the PCI BIOS to initialize it first? 

> "Later in an emulator" is arguably safer than real mode. But the
> emulation needs to be done from kernel at the proper point in the
> resume sequence. Leaving it to the user-mode suspend/resume script
> is not an option.

Why not? 

-Andi



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