I am unable to install the image I built.  When I try uploading firmware I get an error:
"The uploaded image file does not contain a supported format. Make sure that you choose the generic image format for your platform".

I was able to install and run the released binary for my WRT54GSv4 (backfire)  But building my own image gets above error.
I wasn't sure which target is the one for the wrt54gsv4 but it seemed brcm47xx is the correct one.

Anyone can point in how to figure out what is wrong with my config?   Is it possible to find out what is the target for my running image?

Anything else that would explain the error I am getting?

thanks