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authorGravatar Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>2011-09-06 23:16:09 +0200
committerGravatar Peter Korsgaard <jacmet@sunsite.dk>2011-09-27 22:46:00 +0200
commit13a3afc536b845e8de8eea9b91bbc6e7430c4566 (patch)
treee6c12ef1dc34eb5d70877b6c3c7a880958ddce34 /fs/initramfs/Config.in
parent3fac21ef8d794b47f731003b399e704349c54346 (diff)
downloadbuildroot-13a3afc536b845e8de8eea9b91bbc6e7430c4566.tar.gz
buildroot-13a3afc536b845e8de8eea9b91bbc6e7430c4566.tar.bz2
fs/initramfs: refactor with fs/cpio
An initramfs is in fact the same as a cpio archive, but embedded in the kernel. So instead of duplicating the cpio infrastructure, we can simply build images/rootfs.cpio and link that into the kernel. Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Diffstat (limited to 'fs/initramfs/Config.in')
-rw-r--r--fs/initramfs/Config.in13
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/initramfs/Config.in b/fs/initramfs/Config.in
index abb3c0cc03..bbc2ab0b72 100644
--- a/fs/initramfs/Config.in
+++ b/fs/initramfs/Config.in
@@ -1,20 +1,21 @@
config BR2_TARGET_ROOTFS_INITRAMFS
bool "initramfs for initial ramdisk of linux kernel"
depends on BR2_LINUX_KERNEL
+ select BR2_TARGET_ROOTFS_CPIO
help
Integrate the root filesystem generated by Buildroot as an
initramfs inside the kernel image. This integration will
take place automatically.
- The rootfs.initramfs file generated in the images/ directory
- is only a text file describing the contents of the initramfs
- in a format understood by the CONFIG_INITRAMFS_SOURCE kernel
- configuration option.
+ 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.
- Note that enabling initramfs together with other filesystem
+ Note that enabling initramfs together with another filesystem
formats doesn't make sense: you would end up having two
identical root filesystems, one embedded inside the kernel
- image, and one separatly.
+ image, and one separately.
comment "initramfs requires a Linux kernel to be built"
depends on !BR2_LINUX_KERNEL