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Bitbake Cheatsheet

Verbose as possible

bitbake -vDDD your-recipe

List recipes

bitbake -s

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Linux Test Tool Cheatsheet

Compile Main test Tool (Using Yocto)

Append these lines into:

conf/local.conf

BB_NUMBER_THREADS = "5"

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Build Yocto Filesystem for i.MX8MP with support for Etnaviv + Mesa using Mainline Kernel

Introduction

Steps to build the following software for i.MX8MP EVK:

 - yocto: scarthgap (master) 5.0
 - linux: Linux Kernel 6.8-rc2, media-stage master
 - driver: new upstream drv alvium-csi2.c
 - mesa: Mesa 24.0.2 using etnaviv driver

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Cross Compile Libcamera Using Yocto SDK

This try was done using imx8mp-evk, using fsl Yocto bsp master branch.

Get Yocto Sources

cd fsl-community-bsp
repo init -u https://github.com/Freescale/fsl-community-bsp-platform -b master
repo sync

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Win10 iot Enterprise Arm Cheatsheet - zNXP

Set Preferred Video Output

# set LVDS Display
reg ADD "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000" /v Display0Interface /t REG_DWORD /d 0x4 /f"

# set HDMI display
reg ADD "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000" /v Display1Interface /t REG_DWORD /d 0x1 /f"

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A Quick Tour into I.MX8MP Media Subsystem

Introduction

Required hw:

• imx8mp-evk
• imx8mp-ov5640-minisastocsi
• minisas to minisas cable

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Linux Media Subsystem Notes

This document resume some notes to start on contributing to the Linux Media Subsystem. Below some good references links from where to start:

• linuxtv.org
• patchwork
• media_stage
• sailus/media_tree
• git-trees

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Rauc Yocto Integration Tips

Create .ext4 fs Images and Boot.img

core-image-minimal.bbappend

do_image_complete() {
    # Create etc.ext4 part
    dd if=/dev/zero of="${WORKDIR}/etc.ext4" bs=1M count=${ETC_PART_SIZE_MB};
    mke2fs -d ${IMAGE_ROOTFS}/etc -t ext4 -L etc_image ${WORKDIR}/etc.ext4;
 cp -rf ${WORKDIR}/etc.ext4 ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.etc.ext4;

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Linux Tips Cheatsheet

Create User and add to main group

$ sudo useradd -d <folder> <username>
$ sudo usermod -a -G <main-group> <username>
$ sudo passwd <username>
$ su <username>

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/*
 * Test program Linux RS485-mode ioctls.
 * Build:
 * 	- source /opt/fsl-imx-xwayland/5.15-kirkstone/environment-setup-armv8a-poky-linux
 * 	- $CC -o test-rs485 rs485_ioctl_test.c
 * Usage:
 * 	- ./test-rs485 /dev/ttymxc2
 */

#include <stdlib.h>