On 2008-02-05 00:48 yhlu said the following:
On Feb 4, 2008 9:29 PM, Roman Kononov kononov@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.
YH
Roman