[U-Boot] [PATCH V2 2/3] net: fec: do not access reserved register for i.MX6UL

[Peng Fan]

The MIB RAM and FIFO receive start register does not exist on
i.MX6UL. Accessing these register will cause enet not work well.

Signed-off-by: Peng Fan <Peng.Fan at freescale.com>
Signed-off-by: Fugang Duan <B38611 at freescale.com>
Cc: Joe Hershberger <joe.hershberger at ni.com>
Cc: Stefano Babic <sbabic at denx.de>
---

Changes v2:
 Using runtime check, but not hardcoding "#ifdef".
 This patch depends on the runtime checking patch:
 https://patchwork.ozlabs.org/patch/505621/.

 drivers/net/fec_mxc.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index c5dcbbb..bff5fd1 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -17,6 +17,7 @@
 
 #include <asm/arch/clock.h>
 #include <asm/arch/imx-regs.h>
+#include <asm/imx-common/sys_proto.h>
 #include <asm/io.h>
 #include <asm/errno.h>
 #include <linux/compiler.h>
@@ -551,12 +552,15 @@ static int fec_init(struct eth_device *dev, bd_t* bd)
 	writel(0x00000000, &fec->eth->gaddr2);
 
 
-	/* clear MIB RAM */
-	for (i = mib_ptr; i <= mib_ptr + 0xfc; i += 4)
-		writel(0, i);
+	/* Do not access reserved register for i.MX6UL */
+	if (!is_cpu_type(MXC_CPU_MX6UL)) {
+		/* clear MIB RAM */
+		for (i = mib_ptr; i <= mib_ptr + 0xfc; i += 4)
+			writel(0, i);
 
-	/* FIFO receive start register */
-	writel(0x520, &fec->eth->r_fstart);
+		/* FIFO receive start register */
+		writel(0x520, &fec->eth->r_fstart);
+	}
 
 	/* size and address of each buffer */
 	writel(FEC_MAX_PKT_SIZE, &fec->eth->emrbr);
-- 
1.8.4