[coreboot] Cold reset in Tyan s2912

Roman Kononov kononov at dls.net
Tue Feb 5 20:13:15 CET 2008

On 2008-02-05 11:45, yhlu wrote:
> On Feb 5, 2008 7:48 AM, Roman Kononov <kononov at dls.net> wrote:
>> On 2008-02-05 00:48 yhlu said the following:
>>> On Feb 4, 2008 9:29 PM, Roman Kononov <kononov at dls.net> 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:
>> 1) 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.
>> 2) CPU issues another reset.
>> 3) 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.
> that is co-processor problem.
> Please talk the co-processor vendor about that. they have solution for
> you problem. otherwise return that to get one from another vendor.

Thanks for the recommendation. Who makes socket F co-processors?

Can you tell me how to make the cold reset please?


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