Thanks all for the suggestions.
It is not an issue with kernel modules as I have them in /lib/modules/...
I managed to get a bit further and create a working image that boots
fully. However, the only way I could do this was to use the
ROOTFS_POSTPROCESS_COMMAND to manually create a symlink for /init ->
/lib/systemd/systemd
What I don't understand is in a normal build (i.e core-image-minimal, etc.)
I see /init get created automatically. I cannot find in what class or
package this is actually done. My recipe below. Any thoughts?
Thanks again!
Matt.
On Thu, Dec 7, 2023 at 5:37 PM Khem Raj <raj.k...@gmail.com> wrote:
> On Thu, Dec 7, 2023 at 3:04 AM Ross Burton <ross.bur...@arm.com> wrote:
> >
> > On 6 Dec 2023, at 21:47, mattwood2000 via lists.yoctoproject.org
> <mattwood2000=gmail....@lists.yoctoproject.org> wrote:
> > >
> > > Hi,
> > >
> > > I'm trying to create a custom initramfs to handle some things before
> switching root to my actual filesystem. I followed the docs and have been
> able to use INITRAMFS_IMAGE = "custom-image" and INITRAMFS_IMAGE_BUNDLE =
> "1" to generate a zImage for my ARM platform.
> > >
> > > The custom-image.bb recipe is based on the
> core-image-minimal-initramfs recipe and is in a meta-layer that has another
> image recipe for the actual eMMC filesystem image. Both the eMMC image and
> initramfs bundle are created.
> > >
> > > In custom-image.bb, PACKAGE_INSTALL includes INITRAMFS_SCRIPTS which
> seem to be geared towards live-image things but that's not what I want.
> > >
> > > The image boots but hangs waiting for removable media. I figured out
> that /init is not pointing to systemd but the live-image script from
> recipes-core/initrdscripts.
> >
> > The problem is most likely that your kernel is missing eMMC drivers.
> They’re most likely built as kernel modules, but you didn’t install the
> modules into the initramfs. One easy fix is to just add kernel-modules to
> your initramfs.
>
> Right, this is how we tame bbb to include some USB drivers into kernel
> proper so that we can read the USB stick in initramfs
>
> SUMMARY = "initramfs image"
LICENSE = "MIT"
PACKAGE_INSTALL = " \
base-files \
base-passwd \
systemd \
${ROOTFS_BOOTSTRAP_INSTALL} \
"
IMAGE_FEATURES = "debug-tweaks"
IMAGE_LINGUAS = ""
PACKAGE_EXCLUDE = "kernel-image-*"
IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}"
IMAGE_NAME_SUFFIX ?= ""
IMAGE_ROOTFS_SIZE = "8192"
IMAGE_ROOTFS_EXTRA_SPACE = "0"
ROOTFS_PREPROCESS_COMMAND += "install_init; "
install_init () {
ln -sr ${IMAGE_ROOTFS}/lib/systemd/systemd ${IMAGE_ROOTFS}/init
}
inherit core-image
>
> https://github.com/YoeDistro/yoe-distro/blob/master/sources/meta-yoe/dynamic-layers/meta-ti/recipes-kernel/linux/files/updater.cfg
>
> >
> > I do have some tweaks to the initramfs images to post, but they’re not
> quite ready yet. You can see the WIP in poky-contrib:ross/genericarm64.
> >
> > Ross
> >
> >
>
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