[coreboot] Problem with PLL

Marc Jones Marc.Jones at amd.com
Tue Jun 3 18:39:16 CEST 2008

Uwe Schwarz wrote:
> Hi,
> I'm trying to boot coreboot v2 on a AMD db800 (Geode LX) Board. Around  
> 30% of my boots it keeps freezing right after "Configuring PLL" during  
> pll_reset.
> Is there anything I could try to figure out why it's doing that?
> // Uwe

Failing sometimes may mean that there is a hardware problem but here are 
some things you can check.

What is the port80 code when it fails?

Can you narrow down the line that fails, northbridge\amd\lx\pll_reset.c?

If it fails in the reset you can try making the pll lock time longer but 
I doubt that it will help.
msrGlcpSysRstpll.lo |= (0xFF << RSTPPL_LOWER_HOLD_COUNT_SHIFT);

You can check the GLCP_SYS_RSTPLL value that is being set.


Marc Jones
Senior Firmware Engineer
(970) 226-9684 Office
mailto:Marc.Jones at amd.com

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