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[PATCH v4] MIPS: Make the debugging of compressed kernel configurable

To: Ralf Baechle <>
Subject: [PATCH v4] MIPS: Make the debugging of compressed kernel configurable
From: Wu Zhangjin <>
Date: Sun, 31 Jan 2010 20:39:40 +0800
Cc: Manuel Lauss <>,, Wu Zhangjin <>
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From: Wu Zhangjin <>

Changes from v3:

 O Rebased on the latest linux-queue git tree of Ralf.
 O Make the option is disabled by default.
 O Fix the missing CONFIG_ prefix of DEBUG_ZBOOT in Makefile
 (reported by "Manuel Lauss")

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 <>
 arch/mips/Kconfig.debug            |   19 +++++++++++++++++++
 arch/mips/boot/compressed/Makefile |    2 ++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index d2b88a0..32a010d 100644
--- 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.
+       bool "Enable compressed kernel support debugging"
+       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.
diff --git a/arch/mips/boot/compressed/Makefile 
index 76d6930..790ddd3 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_MACH_ALCHEMY)                += $(obj)/uart-alchemy.o
 OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
 $(obj)/vmlinux.bin: $(KBUILD_IMAGE)

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