VFS and FATFS plugin configuration

Release notes for 17.08 briefly describe changes to the FatFS-based plugin. I'm having difficulty making this work with a VFS server and a FAT filesystem on an AHCI block device.

Are there good examples of such a configuration in 17.08?

Some of the examples that I'd hoped would work, from libports (libc_vfs_{fs_fat, fat, component, fatfs_fs}), do not seem to run. Perhaps this reflects the recent changes? Yes, I see none of these are in the autopilot list, and the libc_vfs examples in that list do seem to function correctly, but don't illustrate the desired scenario.

Suggestions? An up-to-date README for VFS would be really handy...

// Steve Harp