[yocto] [meta-raspberrypi] Error trying to generate Raspberry Pi initramfs

[Zoran Stojsavljevic]

Hello Greg,

This, what I have posted as answer work for me on BBB (BeagleBone
Black) seamlessly.

I did not try it on Sabre Automotive, but as we speak, I just
straightened out the optimal local.conf for it (with very rich
networking services on the top of Linux), and I am 100% sure the above
initramfs methodology will work on Sabre Automotive as well.

I have no idea about specifics on RPI 3. Sorry for that.

Best Regads,
Zoran
_______

On Thu, Aug 29, 2019 at 7:40 PM Greg Wilson-Lindberg
<GWilson at sakuraus.com> wrote:
>
> Hi Zoran,
> Thanks for your comments.
>
> I'm adding [meta-raspberrypi] to the as I have realized that some might have missed this Raspberry-pi specific question.
>
> Thanks,
> Greg Wilson-Lindberg
>
> > -----Original Message-----
> > From: Zoran Stojsavljevic [mailto:zoran.stojsavljevic at gmail.com]
> > Sent: Wednesday, August 28, 2019 05:08 PM
> > To: Greg Wilson-Lindberg <GWilson at sakuraus.com>
> > Cc: Yocto list discussion <yocto at yoctoproject.org>
> > Subject: Re: [yocto] Error trying to generate Raspberry Pi initramfs
> >
> > Three things:
> > [1] The initramfs is NOT the initrd (te second one is the temp
> >       stage in booting the linux to mmcblk...); [2] There are some config parameters
> > you need to set up in
> >       your kernel .config file:
> >       https://github.com/ZoranStojsavljevic/bbb-yocto/blob/master/custom/config-
> > initramfs
> > [3] The command line is formed in u-boot or in grub2, or in
> >       your Linux boot loader (you need to add some lines
> >       in ash u-boot config script, as the following example):
> >       https://github.com/ZoranStojsavljevic/bbb-yocto/blob/master/custom/u-boot.ash
> >
> > Good Luck,
> > Zoran
> > _______
> >
> >
> > On Wed, Aug 28, 2019 at 7:26 PM Greg Wilson-Lindberg
> > <GWilson at sakuraus.com> wrote:
> > >
> > > I'm trying to generate an initramfs for a raspberry pi 3 for a sumo build. We are
> > based off of the Qt boot2qt system.
> > >
> > > I have followed the instructions in the meta-raspberrypi.pdf documentation,
> > section 3.14 Image with Initramfs.
> > >
> > > I edited the meta-raspberrypi/recipes-kernel/linux/linux-raspberry.inc file and
> > added the variables into my local.conf file. I created a rpi-minimal-initramfs.bb
> > recipe and it is created when I build the system. But the command line that is put
> > into the boot partition is:
> > >
> > > dwc_otg.lpm_enable=0  root=/dev/mmcblk0p2 rootfstype=ext4 rootwait
> > fbcon=map:10 fbcon=font:VGA8x8
> > >
> > > No initramfs.
> > >
> > > In the linux-raspberry.inc file, after the insertion point for the new kernel variables,
> > there is a test for KERNEL_INITRAMFS. I tried setting this in my local.conf file, but
> > when I do I get an error for a missing file:
> > >
> > > | /home/..../tmp/deploy/images/raspberrypi3/uImage1-raspberrypi3.bin:
> > > | No such file or directory
> > >
> > > So, apparently that can't be set directly.
> > >
> > > There seems to be something missing in the instructions in the meta-
> > raspberrypi.pdf documentation. Anyone that has any experience with setting this up
> > and can help me figure out what I'm missing, I would greatly appreciate the help.
> > >
> > > Regards,
> > > Greg Wilson-Lindberg
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > --
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