From: Wu Zhangjin <wuzhangjin@xxxxxxxxx> 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 <wuzhangjin@xxxxxxxxx> --- 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. +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 76d6930..790ddd3 100644 --- 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) -- 1.6.6
