[Libre-soc-dev] ulx3s-85k successful BIOS boot at 10mhz
Luke Kenneth Casson Leighton
lkcl at lkcl.net
Thu Feb 10 18:38:35 GMT 2022
hooray. i can confirm that a successful BIOS boot occurs at [only] 10 mhz
on the ULX3S-85k which just arrived today. whilst this is horrendously
slow it is a starting point from which analysis of timing reports can be done
to find the excessively-long combinatorial loops and break them.
in parallel with that, the nice thing about the ulx3s-85k is that it uses
SDRAM1 which does not need "training" and unlike DDR3 ICs which
typically cannot run below around 48-55 mhz, SDRAM1 is quite happy
at 10mhz. consequently if absolutely forced to i can try running
linux-5.7 at that speed.
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
More information about the Libre-soc-dev