#define ide_reg_data *((volatile uint8_t *)IDE_REG_DATA)
#define ide_reg_devhead *((volatile uint8_t *)IDE_REG_DEVHEAD)
#define ide_reg_error *((volatile uint8_t *)IDE_REG_ERROR)
-#define ide_reg_features *((volatile uint8_t *)IDE_FEATURES)
+#define ide_reg_features *((volatile uint8_t *)IDE_REG_FEATURES)
#define ide_reg_lba_0 *((volatile uint8_t *)IDE_REG_LBA_0)
#define ide_reg_lba_1 *((volatile uint8_t *)IDE_REG_LBA_1)
#define ide_reg_lba_2 *((volatile uint8_t *)IDE_REG_LBA_2)