I have a similar AMD motherboard as you, and when I first tried
playing with flashrom at the end of August I installed flashrom on
FreeBSD. I got the same message as you:
"FCH device found but SMBus revision 0x61 does not match known values."
Well,
I am retired and messing with computers is my hobby, so I thought maybe
trying a Linux would work better with flashrom, and installed Ubuntu. I
still got the same message, and no real answer until Rene' Rebe posted
this email on Oct 12:
What
I realized was that I needed to download the source, modify a line to
include my particular spi chip, compile and install flashrom myself. I
looked at the documentation, asked questions, and IT WORKED.
And,
besides being able to read my flash chip with flashrom, I have been able
to use it to write a stock bios update from MSI on my x570 motherboard,
and IT WORKED. The first place to look is here:
So
look at Rene's email & the flashrom download & install info,
and ask more questions. Most everyone here is very willing to help.
And,
there is a fix in the works on Gerrit by the flashrom developers, but
it's not yet released.
You might enjoy the #flashrom & #coreboot channels on Freenode IRC.
Best of luck,
Clay