Board name: GeForce 6100PM - M2 V3.0
There was an oddity. After running
$ sudo flashrom -V -p internal > flashrom-V.txt ,
I got this message (which doesn't appear in the capture): Mapping NVIDIA MCP6x SPI at 0xfec80000, unaligned size 0x544.
Dunno what that means, but this specific board wasn't included in the list of boards known to work, but all appeared to go as intended. Thanks!