ColdFire: Fix ethernet hang issue for mcf547x_8x

The ethernet hang is caused by receiving buffer in DRAM is not
yet ready due to access cycles require longer time in DRAM.
Relocate DMA buffer descriptors from DRAM to internal SRAM.

Signed-off-by: TsiChung Liew <Tsi-Chung.Liew@freescale.com>

drivers/net/fsl_mcdmafec.c

@@ -95,7 +95,11 @@ struct fec_info_dma fec_info[] = {
 	 0,			/* duplex and speed */
 	 0,			/* phy name */
 	 0,			/* phy name init */
+#ifdef CFG_DMA_USE_INTSRAM
+	 DBUF_LENGTH,		/* RX BD */
+#else
 	 0,			/* RX BD */
+#endif
 	 0,			/* TX BD */
 	 0,			/* rx Index */
 	 0,			/* tx Index */
@@ -164,7 +168,8 @@ static void dbg_fec_regs(struct eth_device *dev)
 }
 #endif
 
-static void set_fec_duplex_speed(volatile fecdma_t * fecp, bd_t * bd, int dup_spd)
+static void set_fec_duplex_speed(volatile fecdma_t * fecp, bd_t * bd,
+				 int dup_spd)
 {
 	if ((dup_spd >> 16) == FULL) {
 		/* Set maximum frame length */
@@ -513,6 +518,9 @@ int mcdmafec_initialize(bd_t * bis)
 {
 	struct eth_device *dev;
 	int i;
+#ifdef CFG_DMA_USE_INTSRAM
+	u32 tmp = CFG_INTSRAM + 0x2000;
+#endif
 
 	for (i = 0; i < sizeof(fec_info) / sizeof(fec_info[0]); i++) {
 
@@ -533,6 +541,17 @@ int mcdmafec_initialize(bd_t * bis)
 		dev->recv = fec_recv;
 
 		/* setup Receive and Transmit buffer descriptor */
+#ifdef CFG_DMA_USE_INTSRAM
+		fec_info[i].rxbd = (int)fec_info[i].rxbd + tmp;
+		tmp = fec_info[i].rxbd;
+		fec_info[i].txbd =
+		    (int)fec_info[i].txbd + tmp + (PKTBUFSRX * sizeof(cbd_t));
+		tmp = fec_info[i].txbd;
+		fec_info[i].txbuf =
+		    (int)fec_info[i].txbuf + tmp +
+		    (CFG_TX_ETH_BUFFER * sizeof(cbd_t));
+		tmp = fec_info[i].txbuf;
+#else
 		fec_info[i].rxbd =
 		    (cbd_t *) memalign(CFG_CACHELINE_SIZE,
 				       (PKTBUFSRX * sizeof(cbd_t)));
@@ -541,6 +560,7 @@ int mcdmafec_initialize(bd_t * bis)
 				       (CFG_TX_ETH_BUFFER * sizeof(cbd_t)));
 		fec_info[i].txbuf =
 		    (char *)memalign(CFG_CACHELINE_SIZE, DBUF_LENGTH);
+#endif
 
 #ifdef ET_DEBUG
 		printf("rxbd %x txbd %x\n",

include/configs/M5475EVB.h

@@ -72,6 +72,7 @@
 #	define CONFIG_MII_INIT		1
 #	define CONFIG_HAS_ETH1
 
+#	define CFG_DMA_USE_INTSRAM	1
 #	define CFG_DISCOVER_PHY
 #	define CFG_RX_ETH_BUFFER	32
 #	define CFG_TX_ETH_BUFFER	48

include/configs/M5485EVB.h

@@ -72,6 +72,7 @@
 #	define CONFIG_MII_INIT		1
 #	define CONFIG_HAS_ETH1
 
+#	define CFG_DMA_USE_INTSRAM	1
 #	define CFG_DISCOVER_PHY
 #	define CFG_RX_ETH_BUFFER	32
 #	define CFG_TX_ETH_BUFFER	48