Hi, For VO.92, the BIOS setup option "Spread Clock Spectrum" could only control the external clock generator, it cannot affect PCIe Spread Clock Spectrum. Because PCIe Spread Clock Spectrum is a feature controlled by "software strap", which is out of the scope of BIOS.
But for V0.93, in order to pass FCC test, Spread Clock Spectrum of PCIe is required to be enabled (by changing the "software strap" bit that I shared before), and also the BIOS setup option "Spread Clock Spectrum" is required to be hidden from end user. Thanks, David Wei -----Original Message----- From: elinux-MinnowBoard [mailto:[email protected]] On Behalf Of David Scully Sent: Saturday, September 10, 2016 3:45 AM To: [email protected] Subject: Re: [MinnowBoard] MinnowBoard MAX 0.93 64-Bit & network lost Thank you for this quick fix so I didn't have to rebuild the 0.93 firmware to turn this off. It appears that making this modification has resolved my issues with PCIe disconnects. I'm still not sure why I didn't see problems with 0.92 with Spread Clock Spectrum turned on -- Has something changed under the hood for how that feature works between 0.92 and 0.93? We're looking at doing some layout review and checking our our eye diagram. This feature might have pushed our design into a marginal state. -- View this message in context: http://minnowboard.57273.x6.nabble.com/MinnowBoard-MinnowBoard-MAX-0-93-64-Bit-network-lost-tp2387p2416.html Sent from the MinnowBoard mailing list archive at Nabble.com. _______________________________________________ elinux-MinnowBoard mailing list [email protected] http://lists.elinux.org/mailman/listinfo/elinux-minnowboard _______________________________________________ elinux-MinnowBoard mailing list [email protected] http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
