On 10/16/18 9:46 AM, Christian Gmeiner wrote:
Am Mo., 15. Okt. 2018 um 15:26 Uhr schrieb Naresh G. Solanki naresh.solanki.2011@gmail.com:
For problem 1, can you give data on where exactly it hangs?, Is it in OS or FW ?, Can you provide kernel/coreboot log, port 80 dump when it hangs.
It only hangs If I change the following values:
mem_cfg->PegDisableSpreadSpectrumClocking = 1; mem_cfg->PchPmPciePllSsc = 0;The 'physical' cause for the hang is also known: PLT_RST# never gets high again. There are chances that it does not hang but PCI devices (sata, usb hc, ...) are not working as expected as the PCe reference clock is in such a case at around 92 Mhz.
You said earlier that you can dump (but not change) the ICC settings, right? Did you check what settings are made with PchPmPciePllSsc == 0?
If FSP ends up enabling it with a value of 0, I could imagine that this is just unexpected / the result undefined. Did you try other values than 0? 1? I guess the value gives a percentage of a percentage; 0.01% down- spread is probably not too bad.
And maybe somebody with access to the FSP source can document what it does and if there is a switch (missing) to disabled it ;)
Nico
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Nico Huber