[coreboot] [PATCH] Halt TCO timer on Intel 3100 chipset

Peter Stuge peter at stuge.se
Mon Apr 7 23:03:43 CEST 2008

On Mon, Apr 07, 2008 at 03:50:42PM -0400, Jeremy Jackson wrote:
> Pardon my ignorance, but doesn't this at least partly defeat the
> purpose of the TCO timer?  Shouldn't Linuxbios instead be taught
> to poke the keepalive register periodically?

There are some technical issues..

> How about the case of primary/fallback images, can't the TCO timer
> be leveraged to auto-fallback when flashing a new primary image?

..specifically coreboot doesn't handle interrupts.

I think adding interrupt handling would need a bit of work, to make
sure that it is reliable.

Also, there may not be much point in enabling interrupts within
coreboot since interrupts are assigned somewhat late in the process.

Finally there's the payload issue. Even if coreboot keeps the timer
alive the payload may not => fail.


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