Unable to successfully boot Raspberry Pi 4 Yocto with Mender

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1

Hello,

I have followed the below guide to generate an Image using Yocto for the Raspberry Pi 4. After a couple of hours, the compilation finished with success. My host OS is Ubuntu 20.04.

The branch was selected as “dunfell” with recipe as “core-image-base”

Below is my local.conf file for reference:

DISTRO ?= "poky"

PACKAGE_CLASSES ?= "package_rpm"

EXTRA_IMAGE_FEATURES ?= "debug-tweaks"

USER_CLASSES ?= "buildstats image-mklibs image-prelink"

PATCHRESOLVE = "noop"

BB_DISKMON_DIRS ??= "\
    STOPTASKS,${TMPDIR},1G,100K \
    STOPTASKS,${DL_DIR},1G,100K \
    STOPTASKS,${SSTATE_DIR},1G,100K \
    STOPTASKS,/tmp,100M,100K \
    ABORT,${TMPDIR},100M,1K \
    ABORT,${DL_DIR},100M,1K \
    ABORT,${SSTATE_DIR},100M,1K \
    ABORT,/tmp,10M,1K"

PACKAGECONFIG_append_pn-qemu-system-native = " sdl"

CONF_VERSION = "1"


INHERIT += "rm_work"


MENDER_ARTIFACT_NAME = "release-1"

INHERIT += "mender-full"

DISTRO_FEATURES_append = " systemd"
VIRTUAL-RUNTIME_init_manager = "systemd"
DISTRO_FEATURES_BACKFILL_CONSIDERED = "sysvinit"
VIRTUAL-RUNTIME_initscripts = ""


MACHINE ?= "raspberrypi4"

RPI_USE_U_BOOT = "1"

MENDER_STORAGE_TOTAL_SIZE_MB = "1024"
MENDER_BOOT_PART_SIZE_MB = "40"
IMAGE_INSTALL_append = " kernel-image kernel-devicetree"
IMAGE_FSTYPES_remove += " rpi-sdimg"

MENDER_FEATURES_ENABLE_append = " mender-uboot mender-image-sd"
MENDER_FEATURES_DISABLE_append = " mender-grub mender-image-uefi"

KERNEL_DEVICETREE = "bcm2711-rpi-4-b.dtb"

ENABLE_UART = "1"

After burning the .sdimg to an SD card, I have inserted the SD card to the Raspberry Pi 4, connected the board to the PC via USB-serial cable and turned on the board.

Below is my log from serial for reference:

https://1drv.ms/u/s!AuZmsghKqp9tjPJyucDmX7-I60vpxA?e=iM3xQe

It boots all the way until “raspberrypi4 login:” and then shows loading some bluetooth drivers and at the end it gets stuck.

What’s more interesting is that, when I plug and unplug Ethernet, output shows like this:

Poky (Yocto Project Reference Distro) 3.0.4 raspberrypi4 ttyS0                  
                                                                                
raspberrypi4 login: [   13.279168] Bluetooth: HCI UART driver ver 2.3           
[   13.283732] Bluetooth: HCI UART protocol H4 registered                       
[   13.289076] Bluetooth: HCI UART protocol Three-wire (H5) registered          
[   13.297796] Bluetooth: HCI UART protocol Broadcom registered                 
[   13.454604] Bluetooth: BNEP (Ethernet Emulation) ver 1.3                     
[   13.460011] Bluetooth: BNEP filters: protocol multicast                      
[   13.465394] Bluetooth: BNEP socket layer initialized                         
[   13.492085] Bluetooth: RFCOMM TTY layer initialized                          
[   13.497054] Bluetooth: RFCOMM socket layer initialized                       
[   13.502479] Bluetooth: RFCOMM ver 1.11                                       
[  910.482314] bcmgenet fd580000.genet eth0: Link is Down                       
[  925.042407] bcmgenet fd580000.genet eth0: Link is Up - 1Gbps/Full - flow conx

So, it seems that it’s not stuck at loading Bluetooth.

I would really appreciate if anyone could help me in this issue.

Best Regards,
Lakshantha

2

data written to stdout past the login screen is not unusual over serial. when you say stuck, do you mean its not responding to keyboard input over the serial connection?

3

Thanks for the response.

I mean, I cannot login.

When I press ENTER, there is no response.

In normal scenario of a boot process, it should stop at login so that I can enter username. But it’s not the case here.

4

from your log it looks like you into userspace with userspace services starting up.
so i would first check your serial config settings in your terminal emulator to ensure they are correct for two-way comms.

5

I am using minicom.

sudo minicom -D /dev/ttyUSB0 -b 115200

This is how I access.

This is how I normally access my RPi OS over serial and it has responded to keyboard inputs in the same configuration before.

Do I need to create a user in local.conf ?

6

hmmm, not sure then. can you see it on the network, ping it etc

7

Now I have Disabled “Hardware Flow Control” in minicom setup and when I press ENTER, it shows login and I can finally login now!

It’s weird. For RPi OS I dont need to do this

8

great. prob because you need to match how its configured on the back-end, and its configured differently depending on how the image is built

9

You mean match with Mender config side?

10

no, with the yocto build settings, there will be a machine config in your yocto build somewhere with the settings

11

Oh I see. Got you.

Thank you very much for the guidance again. Really appreciate it!

You have been very helpful yesterday also with my X86 local Mender Server issue.

Now finally I can test local OTA updates from the X86 Mender Server to the RPi4 client!

Best Regards,
Lakshantha

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