diff --git a/drivers/net/fddi/defxx.c b/drivers/net/fddi/defxx.c
index 15a18fbe30cf..caed6eee289c 100644
--- a/drivers/net/fddi/defxx.c
+++ b/drivers/net/fddi/defxx.c
@@ -466,7 +466,8 @@ static void dfx_get_bars(struct device *bdev,
 			*bar_len = (bar | PI_MEM_ADD_MASK_M) + 1;
 		} else {
 			*bar_start = base_addr;
-			*bar_len = PI_ESIC_K_CSR_IO_LEN;
+			*bar_len = PI_ESIC_K_CSR_IO_LEN +
+				   PI_ESIC_K_BURST_HOLDOFF_LEN;
 		}
 	}
 	if (dfx_bus_tc) {
@@ -683,6 +684,9 @@ static void dfx_bus_init(struct net_device *dev)
 	if (dfx_bus_eisa) {
 		unsigned long base_addr = to_eisa_device(bdev)->base_addr;
 
+		/* Disable the board before fiddling with the decoders.  */
+		outb(0, base_addr + PI_ESIC_K_SLOT_CNTRL);
+
 		/* Get the interrupt level from the ESIC chip.  */
 		val = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
 		val &= PI_CONFIG_STAT_0_M_IRQ;
@@ -709,25 +713,33 @@ static void dfx_bus_init(struct net_device *dev)
 		/*
 		 * Enable memory decoding (MEMCS0) and/or port decoding
 		 * (IOCS1/IOCS0) as appropriate in Function Control
-		 * Register.  One of the port chip selects seems to be
-		 * used for the Burst Holdoff register, but this bit of
-		 * documentation is missing and as yet it has not been
-		 * determined which of the two.  This is also the reason
-		 * the size of the decoded port range is twice as large
-		 * as one required by the PDQ.
+		 * Register.  IOCS0 is used for PDQ registers, taking 16
+		 * 32-bit words, while IOCS1 is used for the Burst Holdoff
+		 * register, taking a single 32-bit word only.  We use the
+		 * slot-specific I/O range as per the ESIC spec, that is
+		 * set bits 15:12 in the mask registers to mask them out.
 		 */
 
 		/* Set the decode range of the board.  */
-		val = ((bp->base.port >> 12) << PI_IO_CMP_V_SLOT);
+		val = 0;
 		outb(val, base_addr + PI_ESIC_K_IO_ADD_CMP_0_1);
-		outb(0, base_addr + PI_ESIC_K_IO_ADD_CMP_0_0);
-		outb(val, base_addr + PI_ESIC_K_IO_ADD_CMP_1_1);
-		outb(0, base_addr + PI_ESIC_K_IO_ADD_CMP_1_0);
-		val = PI_ESIC_K_CSR_IO_LEN - 1;
+		val = PI_DEFEA_K_CSR_IO;
+		outb(val, base_addr + PI_ESIC_K_IO_ADD_CMP_0_0);
+
+		val = PI_IO_CMP_M_SLOT;
 		outb(val, base_addr + PI_ESIC_K_IO_ADD_MASK_0_1);
-		outb(0, base_addr + PI_ESIC_K_IO_ADD_MASK_0_0);
+		val = (PI_ESIC_K_CSR_IO_LEN - 1) & ~3;
+		outb(val, base_addr + PI_ESIC_K_IO_ADD_MASK_0_0);
+
+		val = 0;
+		outb(val, base_addr + PI_ESIC_K_IO_ADD_CMP_1_1);
+		val = PI_DEFEA_K_BURST_HOLDOFF;
+		outb(val, base_addr + PI_ESIC_K_IO_ADD_CMP_1_0);
+
+		val = PI_IO_CMP_M_SLOT;
 		outb(val, base_addr + PI_ESIC_K_IO_ADD_MASK_1_1);
-		outb(0, base_addr + PI_ESIC_K_IO_ADD_MASK_1_0);
+		val = (PI_ESIC_K_BURST_HOLDOFF_LEN - 1) & ~3;
+		outb(val, base_addr + PI_ESIC_K_IO_ADD_MASK_1_0);
 
 		/* Enable the decoders.  */
 		val = PI_FUNCTION_CNTRL_M_IOCS1 | PI_FUNCTION_CNTRL_M_IOCS0;
diff --git a/drivers/net/fddi/defxx.h b/drivers/net/fddi/defxx.h
index adb63f3f7b4a..9527f0182fd4 100644
--- a/drivers/net/fddi/defxx.h
+++ b/drivers/net/fddi/defxx.h
@@ -1479,8 +1479,10 @@ typedef union
 
 /* Define EISA controller register offsets */
 
-#define PI_ESIC_K_CSR_IO_LEN		0x80		/* 128 bytes */
+#define PI_ESIC_K_CSR_IO_LEN		0x40		/* 64 bytes */
+#define PI_ESIC_K_BURST_HOLDOFF_LEN	0x04		/* 4 bytes */
 
+#define PI_DEFEA_K_CSR_IO		0x000
 #define PI_DEFEA_K_BURST_HOLDOFF	0x040
 
 #define PI_ESIC_K_SLOT_ID            	0xC80
@@ -1558,11 +1560,9 @@ typedef union
 
 #define PI_MEM_ADD_MASK_M		0x3ff
 
-/*
- * Define the fields in the IO Compare registers.
- * The driver must initialize the slot field with the slot ID shifted by the
- * amount shown below.
- */
+/* Define the fields in the I/O Address Compare and Mask registers.  */
+
+#define PI_IO_CMP_M_SLOT		0xf0
 
 #define PI_IO_CMP_V_SLOT		4