[Buildroot] [PATCH] linux: Do not force GZIP initramfs compression
jacmet at uclibc.org
Mon Jul 8 12:57:08 UTC 2013
>>>>> "Valentine" == Valentine Barshak <gvaxon at gmail.com> writes:
Valentine> Initramfs compression does not make much sense for the architectures
Valentine> that support compressed kernel images because in this case the data
Valentine> would be compressed twice. This will eventually result in a bigger
Valentine> kernel image and time overhead when uncompressing it.
Valentine> The only reason to use compressed initramfs is to reduce memory
Valentine> usage when the kernel prepares rootfs, and both the unpacked
Valentine> filesystem and initramfs.cpio are present in the memory.
Valentine> Buildroot attempts to force GZIP compression for initramfs,
Valentine> however it doesn't always work because initramfs compression mode
Valentine> depends on RAM disk compression supported by the kernel.
Valentine> Thus, CONFIG_INITRAMFS_COMPRESSION_GZIP depends on CONFIG_RD_GZIP.
Valentine> If CONFIG_RD_GZIP is not set, setting GZIP initramfs compression
Valentine> will have no effect.
Valentine> Besides, the kernel also supports other compression methods,
Valentine> like BZIP2, LZMA, XZ and LZO. Forcing the good old GZIP does not
Valentine> really make much sense any more.
Valentine> This removes initramfs compression settings from Buildroot,
Valentine> so that the default value preset in the kernel config is used,
Valentine> which is CONFIG_INITRAMFS_COMPRESSION_NONE.
Valentine> If initramfs compression is still needed, it can be set
Valentine> in the kernel config (using make linux-menuconfig)
Sorry, this somehow seems to have fallen through the cracks - Committed,
Bye, Peter Korsgaard
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