Source: failure output supplied by the board owner before the SB200 and
P4R8L patches. The owner reported writing pundit.rom. Excerpt:

flashrom v1.8.0 on Linux 6.18.60 (i686)
Using default programmer "internal" with arguments "".
WARNING: No chipset found. Flash detection will most likely fail.
Found SST flash chip "SST49LF004A/B" (512 kB, FWH) mapped at physical address 0xfff80000.
Reading old flash chip contents... done.
Updating flash chip contents... FAILED at 0x00006cc8! Expected=0xff, Found=0x50, failed byte count from 0x00006000-0x00006fff: 0x318
ERASE FAILED!
Erase/write done from 0 to 7ffff
Write Failed!Uh oh. Erase/write failed. Checking if anything has changed.
Reading current flash chip contents... done.
Good, writing to the flash chip apparently didn't do anything.