Flashrom reports an unsupported chipset. See below and the attached file for a lspci report. Motherboard is an ASRock Taichi x370 with a AMD 5900X processor.

# flashrom --programmer internal
flashrom v1.2 on Linux 5.17.14-gentoo-x86_64 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found chipset "AMD FP4".
Enabling flash write... FCH device found but SMBus revision 0x61 does not match known values.
Please report this to flashrom@flashrom.org and include this log and
the output of lspci -nnvx, thanks!.
Could not determine chipset generation.PROBLEMS, continuing anyway
No EEPROM/flash device found.
Note: flashrom can never write if the flash chip isn't found automatically.

Best regards,