Several legacy hardware drivers are not included in uspace.

[andypugh]

As discussed in #3260

It seems that the hardware exclusin list from the "sim" build target was copied to "uspace", so the following drivers are no longer compiled in uspace builds.

pci_8255
hal_tiro
hal_stg
hal_vti
hal_evoreg
hal_motenc
hal_ax5214h
hal_skeleton
opto_ac5

These are mainly older legacy interfaces, though the Motenc-Lite still appears to be available.

At present these are all still supported by the RTAI builds, but those require extra steps to use, and may not continue indefinitely.

It lis likely that these would actually work if compiled in uspace, but have not been tested.

Step one would be to see if they actually compile.

Step 2 would be to test, which is more difficult, especially as some are ISA bus cards. But it is very unlikely that anyone will be running an ISA bus machine with an up-to-date LinuxCNC.