init/Kconfig: add an option for uncompressed kernel (f16466af) · Commits · 戴 / test

Add "None" as the kernel compression mode. This option is useful for debugging the kernel in slow simulation environments, where decompressing and moving the kernel is awfully slow. Uncompressed kernel implementation might allow early boot code to skip the decompressor and jump right at uncompressed kernel image entry point. Platforms implementing that should define HAVE_KERNEL_UNCOMPRESSED. Reviewed-by:

Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:

Vasily Gorbik <gor@linux.ibm.com> Signed-off-by:

Martin Schwidefsky <schwidefsky@de.ibm.com>

init/Kconfig

+14 −1

Original line number	Diff line number	Diff line
		@@ -125,10 +125,13 @@ config HAVE_KERNEL_LZO
		config HAVE_KERNEL_LZ4
		bool

		config HAVE_KERNEL_UNCOMPRESSED
		bool

		choice
		prompt "Kernel compression mode"
		default KERNEL_GZIP
		depends on HAVE_KERNEL_GZIP \|\| HAVE_KERNEL_BZIP2 \|\| HAVE_KERNEL_LZMA \|\| HAVE_KERNEL_XZ \|\| HAVE_KERNEL_LZO \|\| HAVE_KERNEL_LZ4
		depends on HAVE_KERNEL_GZIP \|\| HAVE_KERNEL_BZIP2 \|\| HAVE_KERNEL_LZMA \|\| HAVE_KERNEL_XZ \|\| HAVE_KERNEL_LZO \|\| HAVE_KERNEL_LZ4 \|\| HAVE_KERNEL_UNCOMPRESSED
		help
		The linux kernel is a kind of self-extracting executable.
		Several compression algorithms are available, which differ
		@@ -207,6 +210,16 @@ config KERNEL_LZ4
		is about 8% bigger than LZO. But the decompression speed is
		faster than LZO.

		config KERNEL_UNCOMPRESSED
		bool "None"
		depends on HAVE_KERNEL_UNCOMPRESSED
		help
		Produce uncompressed kernel image. This option is usually not what
		you want. It is useful for debugging the kernel in slow simulation
		environments, where decompressing and moving the kernel is awfully
		slow. This option allows early boot code to skip the decompressor
		and jump right at uncompressed kernel image.

		endchoice

		config DEFAULT_HOSTNAME

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