Yocto: Persistently disable kernel console logs on Verdin iMX8MP at first boot (works only via manual fw_setenv)

Technical Support
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Fix the FBV Dependency Error

The error occurs because fbv package doesn't exist in your BSP. Based on the Toradex documentation for splash screens, we should use Plymouth instead, which is the recommended approach for splash screen implementation [(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen).

Corrected Splash Screen Recipe

The documentation shows how to properly implement Plymouth-based splash screens [(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen). Here's the corrected recipe:

1. Update recipes-graphics/splash-screen/splash-screen_1.0.bb:

SUMMARY = "Custom splash screen for kernel framebuffer"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"

SRC_URI = “file://splash-logo.bmp”


S = “${WORKDIR}”


do_install() {

install -d ${D}/usr/share/pixmaps


# Install logo for Plymouth and kernel
install -m 0644 ${WORKDIR}/splash-logo.bmp ${D}/usr/share/pixmaps/splash-logo.bmp

# Create a simple framebuffer display script
install -d ${D}/usr/bin
cat > ${D}/usr/bin/show-splash << 'EOF'



#!/bin/sh


Simple framebuffer splash display


if [ -c /dev/fb0 ]; then

# Clear screen and show logo using kernel framebuffer

echo 0 > /sys/class/graphics/fbcon/cursor_blink

cat /usr/share/pixmaps/splash-logo.bmp > /dev/fb0 2>/dev/null || true

fi

EOF

chmod +x ${D}/usr/bin/show-splash

}


FILES:${PN} = “/usr/share/pixmaps/splash-logo.bmp /usr/bin/show-splash”


Remove fbv dependency - not available in BSP

2. Alternative: Plymouth-Based Approach

The documentation provides a complete Plymouth implementation [(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen). Create a Plymouth-based splash screen instead:

Create recipes-core/plymouth/plymouth_%.bbappend:

FILESEXTRAPATHS:prepend := "${THISDIR}/files:"

SRC_URI += " 

file://splash-logo.bmp 

file://spinner.plymouth 

"


EXTRA_OECONF += “–with-runtimedir=/run”


do_install:append () {

install -m 0644 ${WORKDIR}/splash-logo.bmp ${D}${datadir}/plymouth/themes/spinner/watermark.png

install -m 0644 ${WORKDIR}/spinner.plymouth ${D}${datadir}/plymouth/themes/spinner/spinner.plymouth

}

[(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen)

Create recipes-core/plymouth/files/spinner.plymouth:

[Plymouth Theme]
Name=Spinner
Description=A theme that features a simple spinner
ModuleName=two-step

[two-step]

Font=Liberation Sans 12

TitleFont=Liberation Sans 15

ImageDir=/usr/share/plymouth/themes/spinner

DialogHorizontalAlignment=.013

DialogVerticalAlignment=.052

TitleHorizontalAlignment=.52

TitleVerticalAlignment=.80

HorizontalAlignment=.52

VerticalAlignment=.73

WatermarkHorizontalAlignment=.5

WatermarkVerticalAlignment=.96

Transition=none

TransitionDuration=0.0

BackgroundStartColor=0x2e3436

BackgroundEndColor=0x2e3436

BackgroundDirection=vertical

ProgressBarColor=0xffffff

ProgressBarBackgroundColor=0x606060

MessageBelowAnimation=true

[(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen)

3. Enable Plymouth in Your Image

The documentation shows how to add Plymouth to your build [(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen). Add to your conf/local.conf:

CORE_IMAGE_EXTRA_INSTALL += "plymouth"

[(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen)

4. Simplified Kernel Logo Approach

For a simpler solution focusing on kernel logo display, update your splash screen recipe to avoid external dependencies:

SUMMARY = "Custom splash screen for kernel framebuffer"
LICENSE = "MIT"
LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"

SRC_URI = “file://splash-logo.bmp”


S = “${WORKDIR}”


do_install() {

install -d ${D}/usr/share/pixmaps

install -m 0644 ${WORKDIR}/splash-logo.bmp ${D}/usr/share/pixmaps/splash-logo.bmp

}


FILES:${PN} = “/usr/share/pixmaps/splash-logo.bmp”


No external dependencies

Key Fixes

  1. Removed fbv dependency - Not available in your BSP
  2. Added Plymouth support - The recommended approach from Toradex documentation [(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen)
  3. Simplified framebuffer approach - Direct kernel logo display without external tools
  4. Proper file installation - Following Toradex Plymouth implementation patterns [(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen)

The Plymouth approach is the official Toradex method for splash screens and will provide better integration with your silent boot configuration [(1)](https://developer.toradex.com/linux-bsp/os-development/boot/how-to-add-custom-splash-screen/#adding-a-custom-splash-screen).

Best regards, Toradex AI Assistant.

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