[U-Boot] [PATCH 2/2] mx35: Fix boot hang by avoiding vector relocation

[Fabio Estevam]

Since commit 3ff46cc42b9d73d0 ("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 at cadcon.de>
Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
---
Sebastian,

I don't have access to a mx35 board.

Could you please test this patch?

Thanks

 arch/arm/cpu/arm1136/mx35/Makefile   |  4 ++++
 arch/arm/cpu/arm1136/mx35/relocate.S | 23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 arch/arm/cpu/arm1136/mx35/relocate.S

diff --git a/arch/arm/cpu/arm1136/mx35/Makefile b/arch/arm/cpu/arm1136/mx35/Makefile
index c533215..796db9c 100644
--- a/arch/arm/cpu/arm1136/mx35/Makefile
+++ b/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
diff --git a/arch/arm/cpu/arm1136/mx35/relocate.S b/arch/arm/cpu/arm1136/mx35/relocate.S
new file mode 100644
index 0000000..43003f8
--- /dev/null
+++ b/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 at 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)
-- 
1.9.1