[SeaBIOS] [PATCH v5 1/3] ich9: add TCO interface emulation

Michael S. Tsirkin mst at redhat.com
Tue Jun 23 08:39:28 CEST 2015

On Mon, Jun 22, 2015 at 08:10:27PM -0300, Paulo Alcantara wrote:
> This interface provides some registers within a 32-byte range and can be
> acessed through PCI-to-LPC bridge interface (PMBASE + 0x60).
> It's commonly used as a watchdog timer to detect system lockups through
> SMIs that are generated -- if TCO_EN bit is set -- on every timeout. If
> NO_REBOOT bit is not set in GCS (General Control and Status register),
> the system will be resetted upon second timeout if TCO_RLD register
> wasn't previously written to prevent timeout.
> This patch adds support to TCO watchdog logic and few other features
> like mapping NMIs to SMIs (NMI2SMI_EN bit), system intruder detection,
> etc. are not implemented yet.
> Signed-off-by: Paulo Alcantara <pcacjr at zytor.com>

One useful feature to implement could be ability to set the NO_REBOOT
strapping pin to 1. And maybe it's even a better default - will have
to experiment with this feature some more.
Does not have to block this patchset, can be done by a patch on top.


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