Muxing CFI flash controller of SOPC with another controller

The CFI controller the sopc builder offers is nothing special.

in fact it is just a simple interface to the avalon switch fabric the routes the adr and data between them and controls the read and write signals acc. to your setup, access and hold requirements you entered inside the sopc builder.

to share your components, just create your own cfi flash module.

within sopc builder there is a possability to tell the tri state bridge which signals from different components connected to that bridge can be shared. but i think that would need your custom cfi flash ip to be a sopc component. haven't done that yet with modules outside sopc.

but you could create a dummy sopc component that includes your design ....