build # flashrom -w coreboot.rom

flashrom v0.9.2-r1001 on Linux 2.6.36-gentoo-r5 (x86_64), built with libpci 3.1.4, GCC 4.4.4
flashrom is free software, get the source code at http://www.flashrom.org

No coreboot table found.
Found chipset "NVIDIA CK804", enabling flash write... OK.
This chipset supports the following protocols: Non-SPI.
Calibrating delay loop... OK.
Found chip "SST SST49LF080A" (1024 KB, LPC) at physical address 0xfff00000.
===
This flash part has status UNTESTED for operations: 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 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, -Vr,
-Vw, -VE), and mention which mainboard or programmer you tested.
Thanks for your help!
===
Note: If the following flash access fails, try -m <vendor>:<mainboard>.
Writing flash chip... Erasing flash chip... SUCCESS.
Programming page: DONE!ss: 0x000ff000
COMPLETE.
Verifying flash... VERIFIED.

After running flashrom -r backup.bin and comparing the checksum to the original image, I found they were identical.