Another option: SDB


SDB: Self Describing Bus
This was born as a way do describe memory areas
To make some order, and add autodetection in FPGA systems

It lends itself very well to make a simple filesystem
We already used it to that aim, with a barebox patch
We drafted a sdbfs library, but it's not really complete

All addresses are relative
This allows the structure to be moved around
And subdirectories use relative addresses too
You can easily plug pre-filled subdirs to a system

  https://ohwr.org/project/sdb.git
  https://people.mpi-sws.org/~mvanga/files/papers/sdb-1.1.pdf