[yocto] Error trying to generate Raspberry Pi initramfs

[Zoran Stojsavljevic]

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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