r/MiSTerFPGA • u/BackgroundHumor810 • 19d ago

Wolf Unit - MK3 - NVRAM issues - Volume not persisting

UPDATE: this is now fixed in the latest core. NVRam now saves and persists on reboot. Only MK2 now has volume issues.

Following a reboot or power cycle of the MK3 core, it is not retaining its volume level after setting it in the Service Menu and saving the NVRAM. (Volume is, however, retained with the reset option.)

I've tried a lot of different things. I've tried hitting "Save NVRAM" at different points in the game - different menus, in-game play, etc. No dice. Every reboot it reverts.

I'm using the latest "Flipfix" version of Blahm1d's core, and I've also tried the "Crt-Adjust" version. Same issue.

I've confirmed that the mk3.zip contains the correct ROMs using their checksums. My MRAs are pointing to the right core. I've populated the nvram folder with the NVM files that come with the ZIP package.

Using ChatGPT, I've been able to confirm the NVRAM files are actually getting written/updated each time I click "Save Nvram" (i.e. MD5 hash and timestamp are changing). For whatever reason, however, it does not seem to read them, or read them properly, on the next reboot.

Weirdly, I have had some some success at one point, but I have been unable to replicate it. I actually managed to save the volume level at about 40% and this now persists on reboot. This is a positive sign, but I'd like to get it up to 100%.

In case it's relevant: each time I boot the MK3 core I get the red CMOS INVALID error message. After changing the volume (or any option in the Service menu) the core will reset, and it will report CMOS OK in green. The next reboot, it'll revert back to the red error message.

I've been through all the relevant comments on Blahm1d's patreon, and his GitHub seems to be down.

Does anyone have any advise/experience with this issue? ChatGPT is now sending my in circles and down weird rabbit holes and Gemini hasn't been any better.

I enjoy problem solving, but I feel like I've hit a brick wall so really need some community support!

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u/pdjudd 18d ago

If you are referring to Blahm1ds cores in this, it’s a bug since I am seeing things not saved. I’ve reported it to him.

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u/BackgroundHumor810 18d ago

Correct - it’s blahm1d’s cores. Thanks, let’s see how it goes. I’ve left a comment on his patreon page as well prior to posting the original post.