Tommaso Merciai Scott31393

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

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

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;

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:

A Quick Tour into I.MX8MP Media Subsystem

Introduction

Required hw:

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"

Dockerfile - Build Android 11 (Rockchip)

Dockerfile:

FROM ubuntu:bionic

ENV DEBIAN_FRONTEND noninteractive

RUN apt-get update -y && apt-get install -y software-properties-common
RUN add-apt-repository -y ppa:deadsnakes/ppa

U-Boot Coding Cheatsheet

Enable Debug log

define DEBUG before any include in the .c file

#define DEBUG
#undef CONFIG_LOGLEVEL
#define CONFIG_LOGLEVEL 7

muttrc entry for List-id

ignore *
unignore From: Date: To: Cc: Subject: Reply-To: List-ID: Message-ID: In-Reply-To:
hdr_order From: Date: To: Cc: Subject: Reply-To: List-ID: Message-ID: In-Reply-To:

	/*
	* 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>