Hi Casperites, FYI: On the ZCU111 board, Xilinx misdesigned the fan control. Thus the fan is always running full speed, which is why the fan on these boards is so loud. It’s not really Xilinx’s fault. It happened because the manufacturer’s documentation for the fan controller chip is especially poor, which resulted in a FULLSPD pin being high when it should be low — overriding normal fan control and forcing the fan to full speed permanently.
The good news: there are both hardware and software fixes. There is a GPIO connected to the FULLSPD pin, for monitoring it. This GPIO can be flipped from an input to an output in software to override the pullup resistor that’s pulling the FULLSPD pin high. Alternately, the pin right next to the FULLSPD pin is ground, and a solder bridge can be put on the board to pull the pin permanently low for a hardware fix. Either fix works to restore quiet operation to the board. The only consequence would be that the fixes interfere with the monitoring of this pin, but as far as I know there is no software that actually monitors it. I’ve fixed my board in hardware with no adverse consequences to either standalone or linux applications. For further information you can search for “ZCU111 Fan” on google or the Xilinx forums, or follow this link: https://forums.xilinx.com/t5/Xilinx-Evaluation-Boards/ZCU111-Fan-Oddities/td-p/926050 <https://forums.xilinx.com/t5/Xilinx-Evaluation-Boards/ZCU111-Fan-Oddities/td-p/926050> Ross Ross Martin Bit by Bit Signal Processing LLC r...@bitbybitsp.com <mailto:r...@bitbybitsp.com> +1-623-487-8011 -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/15F557A3-037B-4A9B-9321-C9D90846E18F%40ieee.org.
