+259 block Block Extended Major
+ Used dynamically to hold additional partition minor
+ numbers and allow large numbers of partitions per device
+
+259 char FPGA configuration interfaces
+ 0 = /dev/icap0 First Xilinx internal configuration
+ 1 = /dev/icap1 Second Xilinx internal configuration
+
+260 char OSD (Object-based-device) SCSI Device
+ 0 = /dev/osd0 First OSD Device
+ 1 = /dev/osd1 Second OSD Device
+ ...
+ 255 = /dev/osd255 256th OSD Device
+