Hi,
Flashrom seems to not support Gigabyte GA-MA790X-UD4.
I've only tested read operation, which failed, so I did try the write operation.
Here are messages from flashrom:
flashrom v0.9.0-r643 No coreboot table found. Found chipset "AMD SB700", enabling flash write... OK. This chipset supports the following protocols: LPC,FWH,SPI. Found board "GIGABYTE GA-MA78GM-S2H", enabling flash write... FAILED! Calibrating delay loop... OK. Found chip "SST unknown SST SPI chip" (0 KB, SPI) at physical address 0x100000000.
If you need details, you can downloads flashrom -V, dmidecode, lspci outputs at:
https://mais.quest-ce.net/flashrom/ga-ma790x-ud4/
output_dmidecode.txt.gz output_flashrom_V.txt.gz output_flashrom_rV.txt.gz output_lspci.txt.gz output_lspci_vvvxxx.txt.gz
Regards.