README.ASIC: Document workarounds for OSM/Hex*Fury firmware bugs

README.ASIC

@@ -123,6 +123,19 @@ ports. They communicate with the Icarus protocol, which has some additional
 options in README.FPGA
 
 
+HEX*FURY
+--------
+
+Hex*Fury uses the bifury driver. Miners using earlier boards may need to
+workaround bugs in the firmware:
+    bfgminer --set bifury:chips=6 --set bifury:free_after_job=no
+This may cause poor behaviour or performance from other bifury-based devices.
+If you encounter this, you can set the workarounds per-device by using their
+serial number (which can be seen in the TUI device manager; in this example,
+141407160211cdf):
+    bfgminer --set bifury@141407160211cdf:chips=15 ...
+
+
 KLONDIKE
 --------
 
@@ -207,6 +220,16 @@ Depending on your system, you may also need to do:
     echo 1 | sudo tee /sys/module/vfio_iommu_type1/parameters/allow_unsafe_interrupts
 
 
+ONESTRINGMINER
+--------------
+
+OneStringMiner boards use the bifury driver. Miners using earlier boards may
+need to workaround bugs in the firmware:
+    bfgminer --set bifury:chips=15 --set bifury:free_after_job=no
+If you have different devices using the bifury driver, see the section on
+Hex*Fury for applying workarounds per-device.
+
+
 ---
 
 This code is provided entirely free of charge by the programmer in his spare