On Thursday, January 23, 2020 2:24:27 P.M. EST Khem Raj wrote: > On Thu, Jan 23, 2020 at 11:16 AM Greg Wilson-Lindberg > > <[email protected]> wrote: > > Hi Kem, > > I had figured out your suggestions, my problem is how do I generate the > > "<your-image>" image in: > > > > INITRAMFS_IMAGE_rpi = "<your-image>" > > > > I need a recipe for the image and a way to get Yocto to build it when I > > build the rest of my image. Maybe specifying the name will build it, but > > I still need a recipe for the image. > Depends what your needs are, its not clear what you want from this > initramfs image. > is it something you want to do some preboot stuff and pivot into final > image during boot > or do you want your full userspace to be running in it > for second case Just use your image if you want that to be bundled in > and build bitbake virtual/kernel > it will get you single kernel image with everything in it. > > for first case. define a new image perhaps a derivative of > core-image-minimal and use that
There are two useful starting points, openembedded-core/meta/recipes-core/images/core-image-minimal-initramfs.bb openembedded-core/meta/recipes-core/images/core-image-tiny-initramfs.bb Both do not have COMPATIBLE_HOST = "(i.86|x86_64).*-linux" In the end you will most likely want to customize your image as Khem says, so just start by copying one of these and start making adjustments. Alternatively you can do something like the following in your local.conf to overcome this: COMPATIBLE_HOST_pn-core-image-tiny-initramfs = "aarch64-poky-linux" You will want to determine if this initramfs is going to pivot to the 'init' found in the main rootfs, or if you want to simply boot into the 'init' in the initramfs and remain there. Lastly you can either keep the initramfs standalone or have the kernel bundle the initramfs. The latter is useful if you want/need to include software in the initramfs that is needed to get the disks up and running to then get access to the rootfs. Take a look at https://www.yoctoproject.org/docs/2.6/ref-manual/ref-manual.html#var-INITRAMFS_FSTYPES https://www.yoctoproject.org/docs/2.6/ref-manual/ref-manual.html#var-INITRAMFS_IMAGE https://www.yoctoproject.org/docs/2.6/ref-manual/ref-manual.html#var-INITRAMFS_IMAGE_BUNDLE MarkA > > > Regards, > > Greg > > > > -----Original Message----- > > From: Khem Raj <[email protected]> > > Sent: Thursday, January 23, 2020 10:56 AM > > To: Greg Wilson-Lindberg <[email protected]> > > Cc: Yocto list discussion <[email protected]> > > Subject: Re: [yocto] generate initramfs for raspberry pi > > > > On Thu, Jan 23, 2020 at 10:44 AM Greg Wilson-Lindberg <[email protected]> wrote: > > > Hello List, > > > > > > I have not been able to figure out how to generate an initramfs image > > > for a raspberry pi build of yocto. I’ve searched it web and have not > > > found anything that mentions generating the actual image, lots of hits > > > on how to configure using the initramfs, but not on generating it. Is > > > there a standard recipe for a raspberry pi initramfs and how would I > > > enable its generation, or maybe I’m just being clueless. > > > > > > > > > > > > I’m running on a boot2qt build of yocto based on Qt v5.14.0 that uses > > > warrior and I’m targeting an RPi 4 using u-boot. > > > > > > > > > > > > Any help would be greatly appreciated. > > > > try something like below in local.conf > > > > INITRAMFS_IMAGE_BUNDLE_rpi = "1" > > INITRAMFS_IMAGE_rpi = "<your-image>" > > # Enlarge boot partition to 1GiB > > BOOT_SPACE = "1073741" > > INITRAMFS_MAXSIZE = "315400" > > IMAGE_FSTYPES_pn-${INITRAMFS_IMAGE} = "${INITRAMFS_FSTYPES}" > > > > > Best regards, > > > > > > Greg Wilson-Lindberg
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