[Buildroot] initramfs doesn't get linked into kernel
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Sat Apr 27 01:17:58 UTC 2013
Dear Adam Nielsen,
On Sat, 27 Apr 2013 09:37:59 +1000, Adam Nielsen wrote:
> I'm trying to figure out how to get the initramfs image linked in to my kernel
> zImage. I have selected BR2_TARGET_ROOTFS_INITRAMFS (the only option I can
> find in the menuconfig containing 'initramfs') but nothing gets linked in to
> my kernel.
>
> I am using a custom kernel config, and I tried putting the filename of the
> buildroot-generated .cpio image in as CONFIG_INITRAMFS_SOURCE which linked in
> successfully, but then it won't boot as it appears you are supposed to put an
> initramfs configuration filename here instead.
>
> Is it correct that I have to manually put something into
> CONFIG_INITRAMFS_SOURCE? If so, what should I place here to use the rootfs
> generated by buildroot?
If you let Buildroot build your kernel, it does that automatically (see
the code in linux/linux.mk). If you build your kernel outside of
Buildroot, you have to set CONFIG_INITRAMFS_SOURCE correctly.
If you build your kernel outside of Buildroot, pointing
CONFIG_INITRAMFS_SOURCE to the .cpio image works just fine. I'm doing
that all the time here. Here's what I have in my kernel configuration:
CONFIG_INITRAMFS_SOURCE="../marvell-rootfs/images/rootfs.cpio"
Could you attach your Buildroot .config, and your kernel configuration
file (output/build/linux-x.y.z/.config if you build your kernel with
Buildroot) ?
Thanks,
Thomas
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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