Despite the IBM TR boards beeing supported well by LINUX I managed to get some Olicom PCI boards working with LINUX too.
Olicom provided some closed source driver that is hidden somewhere in my software archive for sure.
I remember making it work with a 2.2 kernel required some patchwork, so you will be limited to very old kernels.
Funny thing was that the driver provided an eth interface despite being token ring.
Never got any Madge board working with LINUX, but there are windows drivers for both manufacturers in my archives as well.
I will have a closer look next week, but feel free to remind me if I forget it.