Asus Chromebox CN60, flashed to SeaBios, running Linux.  Running flashrom gives this output:

[stan@chromebox ~]$ sudo flashrom -r -V -p internal
flashrom v1.3.0 on Linux 6.2.15-300.fc38.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).
Warning: Supplied image file name starts with -
coreboot table found at 0x7f73d000.
Found chipset "Intel Lynx Point LP Mainstream".
This chipset is marked as untested. If you are using an up-to-date version
of flashrom *and* were (not) able to successfully update your firmware with it,
then please email a report to flashrom@flashrom.org including a verbose (-V) log.
Thank you!
Enabling flash write... Error accessing ICH RCRB, 0x4000 bytes at 0x00000000fed1c000
/dev/mem mmap failed: Operation not permitted
FAILED!
FATAL ERROR!
Error: Programmer initialization failed.

Fedora 38, current updates.  I don't think the chipset is correct, but I'm going by (perhaps faulty) memory.