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* initramfs: update help textThomas Petazzoni2010-06-261-11/+13
| | | | | Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
* initramfs: only show the option when a Linux kernel is being builtThomas Petazzoni2010-06-261-0/+3
| | | | | | | Closes #2119 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
* linux: add support for initramfsThomas Petazzoni2010-06-221-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In Buildroot, the kernel is built and installed *before* the root filesystems are built. This allows the root filesystem to correctly contain the kernel modules that have been installed. However, in the initramfs case, the root filesystem is part of the kernel. Therefore, the kernel should be built *after* the root filesystem (which, in the initramfs case simply builds a text file listing all files/directories/devices/symlinks that should be part of the initramfs). However, this isn't possible as the initramfs text file would lack all kernel modules. So, the solution choosen here is to keep the normal order: kernel is built before the root filesystem is generated, and to add a little quirk to retrigger a kernel compilation after the root filesystem generation. To do so, we add a ROOTFS_$(FSTYPE)_POST_TARGETS variable to the fs/common.mk infrastructure. This allows individual filesystems to set a target name that we should depend on *after* generating the root filesystem itself (contrary to normal ROOTFS_$(FSTYPE)_DEPENDENCIES, on which we depend *before* generating the root filesystem). The initramfs code in fs/initramfs/initramfs.mk uses this to add a dependency on 'linux26-rebuild-with-initramfs'. In linux/linux.mk, we do various things : * If BR2_TARGET_ROOTFS_INITRAMFS is enabled (i.e if initramfs is enabled as a root filesystem type), then we create an empty rootfs.initramfs file (remember that at this point, the root filesystem hasn't been generated) and we adjust the kernel configuration to include an initramfs. Of course, in the initial kernel build, this initramfs will be empty. * In the linux26-rebuild-with-initramfs target, we retrigger a compilation of the kernel image, after removing the initramfs in the kernel sources to make sure it gets properly rebuilt (we've experienced cases were modifying the rootfs.initramfs file wouldn't retrigger the generation of the initramfs at the kernel level). This is fairly quirky, but initramfs really is a special case, so in one way or another, we need a little quirk to solve its specialness. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
* initramfs: fix init symlinkWill Wagner2010-04-201-0/+2
| | | | | | | | When initramfs was ported to the new fs structure the init symlink macro was defined, but forgot to add it to PRE_GEN_HOOKS Signed-off-by: Will Wagner <will_wagner@carallon.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
* Repair initramfs dependancies after move to fsWill Wagner2010-04-201-0/+6
| | | | | | | | | | The restructure for building root filesystems changed the target name for the initramfs file, to build the file the trget is now initramfs-root but the generated file is rootfs.initramfs Signed-off-by: Will Wagner <will_wagner@carallon.com> Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
* initramfs: trivial fix following move to fsWill Wagner2010-04-151-1/+1
| | | | | Signed-off-by: Will Wagner <will_wagner@carallon.com> Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
* Move all filesystem generation code to fs/Thomas Petazzoni2010-04-093-0/+236
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>