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ARM: 7672/1: uncompress debug support for multiplatform build

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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 and Tegra are exceptions here.  OMAP low-level debug code places
data in the .data section, and that is not allowed in decompressor.
And Tegra code has reference to variable that's unavailable in
decompressor but only in kernel.  That's why Kconfig symbol
DEBUG_UNCOMPRESS controlling multiplatform uncompress debug support is
defined with !DEBUG_OMAP2PLUS_UART && !DEBUG_TEGRA_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 <shawn.guo@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Shawn Guo 2013-03-14 08:48:06 +01:00 committed by Russell King
parent 615967b00f
commit 3b4af9bc24
4 changed files with 25 additions and 0 deletions
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6
arch/arm/Kconfig.debug
View file

@ -601,6 +601,12 @@ 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 && \
!DEBUG_TEGRA_UART
config UNCOMPRESS_INCLUDE
string
default "debug/uncompress.h" if ARCH_MULTIPLATFORM

3
arch/arm/boot/compressed/Makefile
View file

@ -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)

12
arch/arm/boot/compressed/debug.S Normal file
View file

@ -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)

4
arch/arm/include/debug/uncompress.h
View file

@ -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) {}