Hi, I can report that both reading and writing work correctly with
GD25Q128 using the KGPE-D16 motherboard coreboot "internal" eeprom
flasher. I don't know if my chips are the B-type or C-type, so I
guessed "B", and it worked.  Again, both readback and write worked, and
I was able to successfully boot the machine from the written eeprom.

Output below.

$dpkg -l  | grep flashrom
ii  flashrom
1.0-1                                amd64        Identify, read,
write, erase, and verify BIOS/ROM/flash chips

$sudo flashrom -p internal -c GD25Q128B -w coreboot.rom
flashrom  on Linux 5.3.5+ (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).
coreboot table found at 0xb7ce0000.
Found chipset "AMD SB7x0/SB8x0/SB9x0".
Enabling flash write... OK.
Found GigaDevice flash chip "GD25Q128B" (16384 kB, SPI) mapped at
physical address 0x00000000ff000000. ===
This flash part has status UNTESTED for operations: PROBE READ ERASE
WRITE The test status of this chip may have been updated in the latest
development version of flashrom. If you are running the latest
development version, please email a report to [email protected] if
any of the above operations work correctly for you with this flash
chip. Please include the flashrom log file for all operations you
tested (see the man page for details), and mention which mainboard or
programmer you tested in the subject line. Thanks for your help!
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.
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