6

I'm trying to switch my Raspberry Pi 2 to the raspbian kernel rather than the one from raspberry pi foundation (found in raspberrypi-bootloader package).

I installed the linux-image-rpi2-rpfv package, which gave me the appropriate files in /boot:

/boot/System.map-4.4.0-1-rpi2
/boot/vmlinuz-4.4.0-1-rpi2
/boot/config-4.4.0-1-rpi2

During installation an initrd file was generated for this kernel:

/boot/initrd.img-4.4.0-1-rpi2

I updated my config.txt to point to the new initrd:

[...]
initramfs initrd.img-4.4.0-1-rpi2
[...]

And the boot worked fine, but booted the old kernel (kernel7.img, 4.4.11-v7+), since that is still the default. So I set the kernel parameter in config.txt to point to the new kernel:

[...]
kernel=vmlinuz-4.4.0-1-rpi2
initramfs initrd.img-4.4.0-1-rpi2
[...]

And I get stuck with the fullscreen rainbow square indicating a boot issue.

I've tried regenerating the initrd file with update-initramfs -u but since the default kernel boots fine I doubt that's where the issue is.

This is the contents of my cmdline.txt:

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 elevator=deadline root=/dev/mmcblk0p2 rootfstype=ext4 fsck.repair=yes consoleblank=0 rootwait fastboot noswap

This is the full config.txt that fails:

gpu_mem=512
force_turbo=1
avoid_pwm_pll=1
v3d_freq=400
disable_overscan=1
kernel=vmlinuz-4.4.0-1-rpi2
initramfs initrd.img-4.4.0-1-rpi2
framebuffer_depth=32
framebuffer_ignore_alpha=1
framebuffer_swap=0
hdmi_force_hotplug=1

Any hints on how to actually boot the kernel from the linux-image-rpi2-rpfv package?

1

Use ramfsfile Instead

This confused me at first too, but initramfs is not the right key to specify just the initramfs file.

ramfsfile

Optional filename on the boot partition of a ramfs to load. More information is available here.

ramfsaddr

The memory address into which the ramfsfile should be loaded.

initramfs

This specifies both the ramfs filename and the memory address to load it at; it performs the actions of both ramfsfile and ramfsaddr in one parameter. Example values are: initramfs initramf.gz 0x00800000. NOTE: This option uses different syntax to all the other options; you should not use a = character here.

Source

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