|author||Valentine Barshak <email@example.com>||2012-10-10 03:34:56 +0400|
|committer||Peter Korsgaard <firstname.lastname@example.org>||2013-07-08 14:50:31 +0200|
linux: Do not force GZIP initramfs compression
Initramfs compression does not make much sense for the architectures that support compressed kernel images because in this case the data would be compressed twice. This will eventually result in a bigger kernel image and time overhead when uncompressing it. The only reason to use compressed initramfs is to reduce memory usage when the kernel prepares rootfs, and both the unpacked filesystem and initramfs.cpio are present in the memory. Buildroot attempts to force GZIP compression for initramfs, however it doesn't always work because initramfs compression mode depends on RAM disk compression supported by the kernel. Thus, CONFIG_INITRAMFS_COMPRESSION_GZIP depends on CONFIG_RD_GZIP. If CONFIG_RD_GZIP is not set, setting GZIP initramfs compression will have no effect. Besides, the kernel also supports other compression methods, like BZIP2, LZMA, XZ and LZO. Forcing the good old GZIP does not really make much sense any more. This removes initramfs compression settings from Buildroot, so that the default value preset in the kernel config is used, which is CONFIG_INITRAMFS_COMPRESSION_NONE. If initramfs compression is still needed, it can be set in the kernel config (using make linux-menuconfig) Signed-off-by: Valentine Barshak <email@example.com> Acked-by: Arnout Vandecappelle (Essensium/Mind) <firstname.lastname@example.org> Signed-off-by: Peter Korsgaard <email@example.com>
Diffstat (limited to 'fs/initramfs')
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/initramfs/Config.in b/fs/initramfs/Config.in
index 22066eef96..ac45030512 100644
@@ -9,8 +9,8 @@ config BR2_TARGET_ROOTFS_INITRAMFS
A rootfs.cpio file will be generated in the images/ directory.
This is the archive that will be included in the kernel image.
- The rootfs in the kernel will always be gzip'ed, regardless
- of how buildroot's cpio archive is configured.
+ The default rootfs compression set in the kernel configuration
+ is used, regardless of how buildroot's cpio archive is configured.
Note that enabling initramfs together with another filesystem
formats doesn't make sense: you would end up having two