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authorStephen Warren <swarren@nvidia.com>2013-08-02 20:53:37 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-08-25 17:13:41 +0100
commitae3c99a26c60ed0893fc5aedfbb55e32dfc8ab43 (patch)
tree58ff8f11b07a92d04eaa085115ec9ceb5a74e090 /arch/arm/include/debug/tegra.S
parentd2c215aac5228350d33decd1c4c68aaf04793ca1 (diff)
downloadblackbird-op-linux-ae3c99a26c60ed0893fc5aedfbb55e32dfc8ab43.tar.gz
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ARM: 7806/1: allow DEBUG_UNCOMPRESS for Tegra
DEBUG_UNCOMPRESS was previously disallowed for Tegra due to tegra.S's use of global data that was not linked into the decompressor. Solve this by declaring this symbol in tegra.S when it is being built into the decompressor. For the kernel proper, leave the declaration in mach-tegra/common.c as explained in the comment. Signed-off-by: Stephen Warren <swarren@nvidia.com> Tested-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/debug/tegra.S')
-rw-r--r--arch/arm/include/debug/tegra.S29
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/include/debug/tegra.S b/arch/arm/include/debug/tegra.S
index 883d7c22fd9d..be6a720dd183 100644
--- a/arch/arm/include/debug/tegra.S
+++ b/arch/arm/include/debug/tegra.S
@@ -221,3 +221,32 @@
1002:
#endif
.endm
+
+/*
+ * Storage for the state maintained by the macros above.
+ *
+ * In the kernel proper, this data is located in arch/arm/mach-tegra/common.c.
+ * That's because this header is included from multiple files, and we only
+ * want a single copy of the data. In particular, the UART probing code above
+ * assumes it's running using physical addresses. This is true when this file
+ * is included from head.o, but not when included from debug.o. So we need
+ * to share the probe results between the two copies, rather than having
+ * to re-run the probing again later.
+ *
+ * In the decompressor, we put the symbol/storage right here, since common.c
+ * isn't included in the decompressor build. This symbol gets put in .text
+ * even though it's really data, since .data is discarded from the
+ * decompressor. Luckily, .text is writeable in the decompressor, unless
+ * CONFIG_ZBOOT_ROM. That dependency is handled in arch/arm/Kconfig.debug.
+ */
+#if defined(ZIMAGE)
+tegra_uart_config:
+ /* Debug UART initialization required */
+ .word 1
+ /* Debug UART physical address */
+ .word 0
+ /* Debug UART virtual address */
+ .word 0
+ /* Scratch space for debug macro */
+ .word 0
+#endif
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