"I am installing Coreboot on the MSI PRO Z790P motherboard, and during the file build, the following error appears:
E: Image is missing ‘FW_MAIN_A’ region
E: The image will be left unmodified.
make: *** [Makefile.inc:1196: build/coreboot.pre] Error 1
It is asking for the descriptor.bin file, which I cannot find anywhere. How should I proceed with this error? How can I find a solution?"
Hi @RefreT!
I made a mistake and unlisted your post when handling a community flag. While the action wasn’t incorrect, that removed the option for me to give you an explanation. My bad, apologies for that.
Purely Coreboot issues are off-topic in all the categories of the forum that you currently have access to, because the topic of the forum is Qubes OS. We keep it tight so that folks with Qubes OS issues can find answers more easily.
As you participate more in the on-topic categories, you’ll move from being a basic user to becoming a member, and you’ll gain access to the All around Qubes category, where off-topic threads are welcome as long as they are of interest of Qubes OS users. I think your topic would fit perfectly there.
Until then, I’ll encourage you to seek an appropriate forum for your Coreboot question, and I’ll close (not unlist) this topic soon. 
If you are trying to build Daharo, you can use GitHub - Dasharo/coreboot: coreboot component of Dasharo
Just run the build.sh script and select the board you want to build the ROM for, it sets up and compiles everything for you in a docker environment.