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Hmm I just tried on VT8237S and I got

Found chip "Winbond W25Q80" (1024 KB, SPI) at physical address 0xfff00000.

===
This flash part has status UNTESTED for operations: PROBE READ ERASE WRITE
Please email a report to flashrom@flashrom.org if any of the above operations
work correctly for you with this flash part. Please include the flashrom
output with the additional -V option for all operations you tested (-V, -rV,
- -wV, -EV), and mention which mainboard or programmer you tested.
Thanks for your help!
===

Writing flash chip... Erasing flash before programming... Erasing flash chip...

spi_block_erase_20 failed during command execution at address 0x0
spi_block_erase_52 failed during command execution at address 0x0
SUCCESS.
done.
Programming page:
COMPLETE.
Verifying flash... VERIFIED.

So either I did some mistake or something else is wrong ;)