diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index 26d7c54c175e..a39e8d0332c6 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -98,7 +98,9 @@ enum {
 	 * (8192 bytes @ +0x0000, +0x2000, +0x4000 and +0x6000 @ BAR2)
 	 */
 	PORT_REGS_SIZE		= 0x2000,
-	PORT_PRB		= 0x0000, /* (32 bytes PRB + 16 bytes SGEs * 6) * 31 (3968 bytes) */
+
+	PORT_LRAM		= 0x0000, /* 31 LRAM slots and PM regs */
+	PORT_LRAM_SLOT_SZ	= 0x0080, /* 32 bytes PRB + 2 SGE, ACT... */
 
 	PORT_PM			= 0x0f80, /* 8 bytes PM * 16 (128 bytes) */
 		/* 32 bit regs */
@@ -1103,7 +1105,7 @@ static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 		void __iomem *port = port_base + i * PORT_REGS_SIZE;
 		unsigned long portu = (unsigned long)port;
 
-		probe_ent->port[i].cmd_addr = portu + PORT_PRB;
+		probe_ent->port[i].cmd_addr = portu;
 		probe_ent->port[i].scr_addr = portu + PORT_SCONTROL;
 
 		ata_std_ports(&probe_ent->port[i]);