Re: [coreboot] Cold reset in Tyan s2912

[Roman Kononov]

On 2008-02-05 09:48 Roman Kononov said the following:
> On 2008-02-05 00:48 yhlu said the following:
> > On Feb 4, 2008 9:29 PM, Roman Kononov  wrote:
> > > I have difficulty cold-resetting Tyan s2912, which has mcp55.
> > >
> > > The sequence
> > >      outb(0x2,0xcf9);
> > >      outb(0x6,0xcf9);
> > > is a warm reset. It does not reset the HyperTransport link frequency and width.
> >
> > how do you know?
> >
> > do you have other co-processor or htx installed?
>
> I have a co-processor.
>
> The sequence I hope to have:
> Power up. Power-on reset. The co-processor takes long time to become
>
> alive (~500s). By this time the CPU thinks that the HT link is dead.

~0.5s here.
> CPU issues another reset.
> The CPU re-initializes the HT link and the connection is happy.
>
> With the above sequence, the step 3) is a warm reset, and the CPU does 
> not attempt to re-initialize the link.
> > YH
>
> Roman