I am writing a primary bootloader to boot the Unmatched.
The RISC-V fu740 manual does not appear to document the DDR controller and PHY Control register options very extensively (section 23.2.2, p.198)–I am sure there are too many options.
Thinking I could clone known good settings for the Unmatched board, I have a copy of
u-boot and the Freedom SDK source, but cannot find in these repos where SiFive sets these registers on boot for the Unmatched. If anyone knows the proper settings for the Unmatched board, or where I can find them documented or implemented in source, I’d very much appreciate it. (I am working on Step 3 of section 23.3 on page 200.)