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 8c5d686dd6860fb3a1c7a8bd6e38ed8fbeede40f)
@@ -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 {