[U-Boot] [PATCH] pxa: Fix boot hang by avoiding vector relocation

[Andrew Ruder]

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

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

This allows pxa to boot again.

Cc: Marek Vasut <marex at denx.de>
Signed-off-by: Andrew Ruder <andrew.ruder at elecsyscorp.com>
---
 arch/arm/cpu/pxa/Makefile   |  1 +
 arch/arm/cpu/pxa/relocate.S | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 arch/arm/cpu/pxa/relocate.S

diff --git a/arch/arm/cpu/pxa/Makefile b/arch/arm/cpu/pxa/Makefile
index 8cd475e..3ee08cd 100644
--- a/arch/arm/cpu/pxa/Makefile
+++ b/arch/arm/cpu/pxa/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_CPU_PXA27X)	+= pxa2xx.o
 obj-y	+= cpuinfo.o
 obj-y	+= timer.o
 obj-y	+= usb.o
+obj-y	+= relocate.o
diff --git a/arch/arm/cpu/pxa/relocate.S b/arch/arm/cpu/pxa/relocate.S
new file mode 100644
index 0000000..fafd4da
--- /dev/null
+++ b/arch/arm/cpu/pxa/relocate.S
@@ -0,0 +1,23 @@
+/*
+ *  relocate - PXA270 vector relocation
+ *
+ *  Copyright (c) 2013  Albert ARIBAUD <albert.u.boot at aribaud.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * The PXA 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)
-- 
2.1.4