[U-Boot] [PATCH 1/2] mx31: Fix boot hang by avoiding vector relocation

[Fabio Estevam]

Since commit 3ff46cc42b9d73d0 ("arm: relocate the exception vectors") mx31
does not boot anymore.

Add a specific relocate_vectors macro that skips the vector relocation, as the
i.MX31 SoC does not provide RAM at the high vectors address (0xFFFF0000), and
(0x00000000) maps to ROM.

This allows mx31 to boot again.

Cc: Anatolij Gustschin <agust at denx.de>
Cc: Magnus Lilja <lilja.magnus at gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
---
Anatolij/Maguns,

I don't have access to a mx31 board.

Could you please test this patch?

Thanks

 arch/arm/cpu/arm1136/mx31/Makefile   |  4 ++++
 arch/arm/cpu/arm1136/mx31/relocate.S | 23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 arch/arm/cpu/arm1136/mx31/relocate.S

diff --git a/arch/arm/cpu/arm1136/mx31/Makefile b/arch/arm/cpu/arm1136/mx31/Makefile
index 9670ed9..dcbd570 100644
--- a/arch/arm/cpu/arm1136/mx31/Makefile
+++ b/arch/arm/cpu/arm1136/mx31/Makefile
@@ -8,3 +8,7 @@
 obj-y	+= generic.o
 obj-y	+= timer.o
 obj-y	+= devices.o
+
+ifndef CONFIG_SPL_BUILD
+obj-y  += relocate.o
+endif
diff --git a/arch/arm/cpu/arm1136/mx31/relocate.S b/arch/arm/cpu/arm1136/mx31/relocate.S
new file mode 100644
index 0000000..1c556df
--- /dev/null
+++ b/arch/arm/cpu/arm1136/mx31/relocate.S
@@ -0,0 +1,23 @@
+/*
+ *  relocate - i.MX31-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.MX31 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