[PATCH v4 2/2] ARM: uncompress debug support for multiplatform build
From: Shawn Guo <hidden>
Date: 2013-03-11 11:35:37
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Instead of giving zero support of uncompress debug for multiplatform build, the patch turns uncompress debug into one part of DEBUG_LL support. When DEBUG_LL is turned on for a particular platform, uncompress debug works too for that platform. OMAP is an exception here. OMAP low-level debug code places data in the .data section, and that is allowed in decompressor. That's why Kconfig symbol DEBUG_UNCOMPRESS that controls multiplatform uncompress debug support is defined with !DEBUG_OMAP2PLUS_UART. It creates arch/arm/boot/compressed/debug.S with CONFIG_DEBUG_LL_INCLUDE included there, implements a generic putc() using those macros, which will be built when DEBUG_UNCOMPRESS is defined. Signed-off-by: Shawn Guo <redacted> Acked-by: Olof Johansson <redacted> --- arch/arm/Kconfig.debug | 4 ++++ arch/arm/boot/compressed/Makefile | 3 +++ arch/arm/boot/compressed/debug.S | 12 ++++++++++++ arch/arm/include/debug/uncompress.h | 4 ++++ 4 files changed, 23 insertions(+) create mode 100644 arch/arm/boot/compressed/debug.S
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index fc54a5b..559228c 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug@@ -601,6 +601,10 @@ config DEBUG_LL_INCLUDE default "debug/zynq.S" if DEBUG_ZYNQ_UART0 || DEBUG_ZYNQ_UART1 default "mach/debug-macro.S" +config DEBUG_UNCOMPRESS + bool + default y if ARCH_MULTIPLATFORM && DEBUG_LL && !DEBUG_OMAP2PLUS_UART + config UNCOMPRESS_INCLUDE string default "debug/uncompress.h" if ARCH_MULTIPLATFORM
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 5cad8a6..e3238bc 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile@@ -24,6 +24,9 @@ endif AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) HEAD = head.o OBJS += misc.o decompress.o +ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y) +OBJS += debug.o +endif FONTC = $(srctree)/drivers/video/console/font_acorn_8x8.c # string library code (-Os is enforced to keep it much smaller)
diff --git a/arch/arm/boot/compressed/debug.S b/arch/arm/boot/compressed/debug.S
new file mode 100644
index 0000000..6e8382d
--- /dev/null
+++ b/arch/arm/boot/compressed/debug.S@@ -0,0 +1,12 @@ +#include <linux/linkage.h> +#include <asm/assembler.h> + +#include CONFIG_DEBUG_LL_INCLUDE + +ENTRY(putc) + addruart r1, r2, r3 + waituart r3, r1 + senduart r0, r1 + busyuart r3, r1 + mov pc, lr +ENDPROC(putc)
diff --git a/arch/arm/include/debug/uncompress.h b/arch/arm/include/debug/uncompress.h
index e19955d..0e2949b 100644
--- a/arch/arm/include/debug/uncompress.h
+++ b/arch/arm/include/debug/uncompress.h@@ -1,3 +1,7 @@ +#ifdef CONFIG_DEBUG_UNCOMPRESS +extern void putc(int c); +#else static inline void putc(int c) {} +#endif static inline void flush(void) {} static inline void arch_decomp_setup(void) {}
--
1.7.9.5