MIPS: Make the debugging of compressed kernel configurable

This patch adds a new DEBUG_ZBOOT option to allow the users to enable it
to debug the compressed kernel support for a new board and this optoin
should be disabled to reduce the kernel image size and speed up the
kernel booting procedure when the compressed kernel support is stable.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Manuel Lauss <manuel.lauss@googlemail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/918/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index d2b88a0be5199715b003668f5c528a0c6cefcafe..32a010d5edb98f448b71852ff25cf0f982d2b463 100644 (file)
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -102,4 +102,23 @@ config RUNTIME_DEBUG
          arch/mips/include/asm/debug.h for debugging macros.
          If unsure, say N.
 
+config DEBUG_ZBOOT
+       bool "Enable compressed kernel support debugging"
+       depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
+       default n
+       help
+         If you want to add compressed kernel support to a new board, and the
+         board supports uart16550 compatible serial port, please select
+         SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
+         debug it.
+
+         If your board doesn't support uart16550 compatible serial port, you
+         can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
+         debug it. for example, add a new serial port support just as
+         arch/mips/boot/compressed/uart-16550.c does.
+
+         After the compressed kernel support works, please disable this option
+         to reduce the kernel image size and speed up the booting procedure a
+         little.
+
 endmenu

diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index 76d69303b8336d7d001886a49f641df035f9471c..790ddd39762080b9e0900f3c3b1e32b51ad7860b 100644 (file)
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -35,8 +35,10 @@ KBUILD_AFLAGS := $(LINUXINCLUDE) $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
 
 obj-y := $(obj)/head.o $(obj)/decompress.o $(obj)/dbg.o
 
+ifdef CONFIG_DEBUG_ZBOOT
 obj-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
 obj-$(CONFIG_MACH_ALCHEMY)                += $(obj)/uart-alchemy.o
+endif
 
 OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
 $(obj)/vmlinux.bin: $(KBUILD_IMAGE)