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[PATCH -queue v2] MIPS: Cleanup the debugging of compressed kernel suppo

To: Ralf Baechle <>
Subject: [PATCH -queue v2] MIPS: Cleanup the debugging of compressed kernel support
From: Wu Zhangjin <>
Date: Tue, 26 Jan 2010 23:02:33 +0800
Cc:, Wu Zhangjin <>
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From: Wu Zhangjin <>

Changes from v1 (feedbacks from Ralf):

  o make DEBUG_ZBOOT also depend on DEBUG_KERNEL

  o DEBUG_ZBOOT already depends on SYS_SUPPORTS_ZBOOT_UART16550 so simplify the
  obj-$(CONFIG_DEBUG_ZBOOT_UART16550) into just obj-$(CONFIG_DEBUG_ZBOOT) and
  no ifdef.

This patch adds a new DEBUG_ZBOOT option to allow the developers to
debug the compressed kernel support for a new board.

Signed-off-by: Wu Zhangjin <>
 arch/mips/Kconfig.debug            |   18 ++++++++++++++++++
 arch/mips/boot/compressed/Makefile |    2 +-
 2 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index d2b88a0..5e556f7 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -102,4 +102,22 @@ config RUNTIME_DEBUG
          arch/mips/include/asm/debug.h for debugging macros.
          If unsure, say N.
+       bool "Enable compressed kernel support debugging"
+       depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT_UART16550
+       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.
diff --git a/arch/mips/boot/compressed/Makefile 
index 91a57a6..432b939 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
 obj-y := $(obj)/head.o $(obj)/decompress.o $(obj)/dbg.o
-obj-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
+obj-$(CONFIG_SYS_SUPPORTS_ZBOOT) += $(obj)/uart-16550.o
 OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
 $(obj)/vmlinux.bin: $(KBUILD_IMAGE)

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