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pxa: Fix boot hang by avoiding vector relocation

PATCH New Andrew Ruder 2 participants 2 messages Aug 12, 2015 Arm (32-bit)

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Andrew Ruder

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PATCH 1/1 pxa: Fix boot hang by avoiding vector relocation

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 <[email protected]>
Signed-off-by Andrew Ruder <[email protected]>
---
 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
arch/arm/cpu/pxa/Makefile +1 -0
index 8cd475e..3ee08cd 100644
@@ -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
arch/arm/cpu/pxa/relocate.S new file +23 -0
new file mode 100644
index 0000000..fafd4da
@@ -0,0 +1,23 @@
+/*
+ *  relocate - PXA270 vector relocation
+ *
+ *  Copyright (c) 2013  Albert ARIBAUD <[email protected]>
+ *
+ * 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)
Signature · 1 line
2.1.4
#1 lore raw

PATCH 1/1 pxa: Fix boot hang by avoiding vector relocation

Quoted 11 lines · 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 <[email protected]>
Signed-off-by Andrew Ruder <[email protected]>

Applied to u-boot-pxa/master, thanks.

Best regards,
Marek Vasut