Index: uspace/lib/ata/include/ata/ata_hw.h
===================================================================
--- uspace/lib/ata/include/ata/ata_hw.h	(revision a38d50441a00157a8528ae5eeedffc144c4df62e)
+++ uspace/lib/ata/include/ata/ata_hw.h	(revision df1b4a8136a5c966c3f8cda35b46f6d2e2fc2f05)
@@ -105,4 +105,5 @@
 #define REG_STATUS offsetof(ata_cmd_t, status)
 #define REG_COMMAND offsetof(ata_cmd_t, command)
+#define REG_FEATURES offsetof(ata_cmd_t, features)
 
 enum devctl_bits {