mx35: Fix boot hang by avoiding vector relocation

Since commit 3ff46cc42b ("arm: relocate the exception vectors") mx35
does not boot anymore.

Add a specific relocate_vectors macro that skips the vector relocation, as the
i.MX35 SoC does not provide RAM at the high vectors address (0xFFFF0000), and
(0x00000000) maps to ROM.

This allows mx35 to boot again.

Cc: Sebastian Priebe <sebastian.priebe@cadcon.de>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/arm1136/mx35/Makefile

@@ -10,3 +10,7 @@
 obj-y	+= generic.o
 obj-y	+= timer.o
 obj-y	+= mx35_sdram.o
+
+ifndef CONFIG_SPL_BUILD
+obj-y  += relocate.o
+endif

arch/arm/cpu/arm1136/mx35/relocate.S

@@ -0,0 +1,23 @@
+/*
+ *  relocate - i.MX35-specific vector relocation
+ *
+ *  Copyright (c) 2013  Albert ARIBAUD <albert.u.boot@aribaud.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * The i.MX35 SoC is very specific with respect to exceptions: it
+ * does not provide RAM at the high vectors address (0xFFFF0000),
+ * thus only the low address (0x00000000) is useable; but that is
+ * in ROM, so let's avoid relocating the vectors.
+ */
+	.section	.text.relocate_vectors,"ax",%progbits
+
+ENTRY(relocate_vectors)
+
+	bx	lr
+
+ENDPROC(relocate_vectors)