B450M Steel Legend can't boot

The AGESA is basically a firmware roadmap for all the functionality integrated
into the CPU. A while back now all motherboards contained a northbridge and
southbridge chipset, these controlled the vast majority of board functions and
put control over features predominantly in the hands of board manufacturers, at
least to a much larger extent than today. Now, the northbridge, or it's equivalent,
is integrated into the CPU (both intel and AMD).

This is one of the key reasons boards get blamed for problems more now than ever
before. Add to that the fact that the memory controller is likewise now integrated
into the CPU and you start seeing a pattern.
As for VMs, the AGESA controls just about every feature that would have been on
the northbridge, including critical functionality needed for VMs. Given how much
of a niche VM users are, AMD will often overlook bugs and glitches in this portion
of their code, choosing instead to focus on more broadly relevant issues. That
is why certain AGESA versions are better and worse for things like VMs and other
less commonly used features.

ThreeDee wrote: I am constantly trying new BIOS's and the most recent ones have been trash for the x570 Taichi and the x570 Steel Legend as far as memory stability

My board is so picky with Ram I purchased Ram with the same part number which ended up having different chips on it and would cause BSOD's (It didn't read back as Kingston branded Ram which is what it was). Ended up returning this Ram and buying the same part again elsewhere and this time the stick was reading Kingston in CPU-Z no BSOD's.

The amount of time I wasted trying to resolve the issue thinking surely the board wasn't the issue really ticked me off. If I didn't manage to get my board working again after this recent BIOS flash I was planning on returning it.

I am not sure how common it is with BIOS updates to be put on an official website for consumers if its still classed as beta, however this is the first time I have encountered this and such issues after a BIOS flash.

I say this every new launch, before updating to support new CPUs wait for a few
months so the AGESA is mature. The only time I would update during a new launch
is if I already have the new CPU in hand. AMD is still terrible with launching
before the AGESA is mature.

Some of us update for the challenge/fun of it but we do so knowing the risks.

B450 boards do not support Ryzen 5000 at this time. I believe there are some
rumors that it will be supported at some point but nothing official, yet. As far as
I am aware the support will only happen some time in the beginning of next year.

Edited by Xaltar - 02 Dec 2020 at 11:31pm

ThreeDee wrote: 3200g is a Raven Ridge APU I'd recommend flashing back to previous BIOS revision that worked for you. Incidentally, I'm not seeing any BIOS revision being marked as compatible with Ryzen 5000 series... ?

Most recent BIOS update on the page no longer confirms 5000 series support so unsure if its included in that BIOS update now.

I originally saw a beta BIOS for 5000 series on reddit and figured I would wait until it was official on the b450m webpage on asrock website which it was flashed it and had problems. Within about 24-48hours the description on that specific BIOS version changed from saying '5000 series support' to 'optimized stability' or something to that effect.

Would have been good if the ended up removing 5000 series support from that BIOS version for them to at least have a message up how users can flash/boot back into BIOS with current version to flash back. I am quite disappointed about this.

I have flashed back to 2.90 and have not had time to work on my machine so hopefully things are back to normal when I power it back up shortly.

In future I think I will wait several months to be dead certain the BIOS version is stable before flashing.

3200g is a Raven Ridge APU

I'd recommend flashing back to previous BIOS revision that worked for you.

Incidentally, I'm not seeing any BIOS revision being marked as compatible with Ryzen 5000 series... ?