[yocto] struggling with initramfs

[Prakash Ks]

Try Adding
KERNEL_INITRAMFS = "-initramfs"
in platform specific .conf file


Thanks!
Prakash

On Tue, Jul 3, 2018 at 11:53 AM Tim Hammer <tdhammer99 at gmail.com> wrote:

>
> Can anyone point me to a step-by-step tutorial or simple how-to on
> creating and using an initramfs with my kernel for ARM aarch64?
>
>
> I have tried creating my own:
>  - boot-image.bb file with IMAGE_FSTYPES = "cpio.gz".
>  - local.conf has INITRAMFS_IMAGE_BUNDLE = "1"
>  - linux.bbappend has INITRAMFS_IMAGE = "boot-image"
>
> This all seems to be "correct" to the extent that bitbake linux tries to
> do the right thing.
>
> However, I get a failure in do_bundle_initramfs- "mv: cannot stat
> 'arch/arm64/boot/Image': No such file or directory".
>
> To the best of my (limited) debugging abilities with Yocto, it seems like
> the kernel image backup has already been run when it gets to this point and
> the Image file in that directory has already been moved to Image.bak. If I
> comment out the mv statement in kernel.bbclass causing the failure, the
> process continues, but the initramfs does not seem to get populated or
> perhaps installed into my kernel image as I get kernel panics that I have
> been unable to get past.
>
>
> I decided to take a different approach and try using the
> core-image-minimal-initramfs recipe as INITRAMFS_IMAGE. By commenting out
> the COMPATIBLE_HOST entry I am able to build a kernel for ARM aarch64. I
> can even seem to boot into this initramfs- it counts down waiting for
> removable media; seems to find my primary rootfs on sda3, but there is no
> rootfs.img file there so says it is dropping to a shell (although I never
> get a prompt...).
>
> Thinking I could start with that recipe and work to get rid of the live
> stuff and just get to a busybox prompt before trying to run my unique init
> commands, I copied  core-image-minimal-initramfs.bb to my-
> core-image-minimal-initramfs.bb in my layer and changed INITRAMFS_IMAGE
> to "my- core-image-minimal-initramfs".
> However, I obviously missed something in the configuration as I get an
> error in go_bundle_initramfs again:
>      kernel-source/scripts/gen_initramfs_list.sh:
>                  Cannot open
> '/.../linux-qoriq/4.14-r0/build/usr/my-core-image-minimal-initramfs-{machine}.cpio'
>
> Any help would be greatly appreciated.
> Thank you!
> --
>
> .Tim
> --
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> yocto at yoctoproject.org
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>


-- 
Thanks and Regards,
Prakash K S
+91 9620140303
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