On 22 Jan 2024, at 18:17, greymattr via lists.yoctoproject.org
<mfatheree=opto22....@lists.yoctoproject.org> wrote:
>
> I am using the kirkstone yocto build to build a firmware image that has a
> kernel with initramfs, and a ext4 root file system on an emmc partition.
> After booting up the kernel doesn't mount the device passed to the kernel as
> the "root=" parameter and doesn't switch_root, it just mounts everything to
> ram.
>
> In my initramfs image recipe I have set:
> PACKAGE_INSTALL = "util-linux udev busybox base-passwd
> ${VIRTUAL-RUNTIME_base-utils} ${VIRTUAL-RUNTIME_dev_manager}
> ${ROOTFS_BOOTSTRAP_INSTALL}"
>
> and I was under the impression that the ${ROOTFS_BOOTSTRAP_INSTALL} should
> handle the switch_root portion of the boot after the initramfs loads, but
> that is not happening.
> Is there a different package I need to add to the PACKAGE_INSTALL to allow
> the real root partition to be mounted, and switch_root to occur?
$ bitbake-getvar -r core-image-minimal —value ROOTFS_BOOTSTRAP_INSTALL
ROOTFS_BOOTSTRAP_INSTALL="run-postinsts”
ROOTFS_BOOTSTRAP_INSTALL is the list of recipes that also need to be installed
to handle rootfs stuff, so typically it’s either empty or includes
run-postinsts to run any postinstall scripts that couldn’t be ran on the build
host.
The initramfs-framework recipes have various pieces of the typical initramfs
setup in (scan for devices, mount, pivot, etc) and these are used in
core-image-minimal-initramfs. I actually recently added to master a slimmer
image which _just_ finds and pivots:
https://git.yoctoproject.org/poky/tree/meta/recipes-core/images/core-image-initramfs-boot.bb
Ross
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