Peta Linux Technical Training Summary

Course objectives

• Install the Peta Linux Development Environment 
• Fundamentals of The Peta Linux -Yacto
• Application Creation for Peta Linux User Level

Lesson 1: Introduction & Overview

What is Peta-linux

• Open Source cross platform tools 
• NOT a Linux distribution

Using PetaLinux Tools 

• Build Peta Linux for Ultra96
• Customize and configure Ultra96
• Vivado Hardware into Peta linux
• Create Own Peta Linux BSP

Peta Linux History

• Linux is a Free version of Unix for x86 - 1991
• Linux is ported to arm in 1994 on Acorn Processor
• Xilinx acquired PelaLogix -Peta-Linux First public release in 2013

6 Peta Linux Commands

• Peta Linux tool uses Yacto community
• QEMU emulates Petalinux under x86 Linux
• Open Source based with Some HW Driver expectation
• Includes and Manages Linux kernel Sources
• Various HW Drivers and Modules with Linux Application & utilities
• Included U-boot, FSBL, ARM trusted Firmware
• Works Directly with Vivado IP blocks
• Imports HW Designs into the PL-FPGA
• 2021.2 to Linux Kernal 5.10
• Works with Vitis, Vivado and SDSoc
• Peta Linux works on APU 4 -64Bit Multi tasking 
• R5- Can not Run Peta Linux they Run FreeRTOS
• Communication between A53 and R5 can use OpemAMP
• Peta Linux is not a Pure RTOS

Peta Linux Design Flow

1. Export the Design from Vivado
2. Configure the APplication in Peta Linux
3. Create the Application in Vitis - Debug and Profile
4. Package and Deploy in the Hardware 

Peta Linux Tool Flow

1. Select BSP
2. Configure the Kernal, Application and System Settings
3. Build the Kernala and Root Filesystems
4. Boot on QEMU or Zynq PL

Lab 0 - installation

Lesson 2: All About Yacto

What is YACTO ? : https://docs.yoctoproject.org/index.html

• Open source collaboration project provides methods to create custom Linux based System
• Its a Framework not a system
• Uses bitbake build tool
• Populator for embedded systems

Petalinux platform configuration 

• PS-PL configuration can be different : 
• Device Tree -  A special Data File - information for Kernel about the hardware  
• DTS : Device Tree Source : Description of System Device tree
• DTB  : Device Tree Blob :Compiled Binary representation of DTS.
• DTC : Device Tree Compiler  : Converts DTS to a DTB and vice versa

What is Device Tree Structure 

• DTB provided to kernel at Boot Time
  • System memory location/Size
  • Device types, address mappings 
• Kernel infrastructure binds drivers ti devices
  • Matches compatibility in device node
  • Device driver declares known compatible devices 
• Peta Linux generates Device tree in Automated way

Lesson 3

• Wide range of connectivity at ultra96 
•  Wifi Module - ATWILC3000
• USB2.0, USB3.0

LAB3 : WiFi Connectivity

Lesson 4 : PetaLinux User Application Development 

• User Application access virtual Address
• Memory mapped address space, virtual and Physical Address
• Managed by MMU - Memory managed Unit
  • Prevents interference from another application
  • No need of user application to map to Hardware manipulation
  • HW can be shared with several application 
  • OS can control the user program
  • SW and HW security increased due to MMU
• Disadvantages of MMU
  • Performance or latency issue” Pass through cache memories
  • Inter processor communication is Slower for multiple application
• User vs Kernel Application Code

LAB 4 : Creating Peta Linux Application using Vitis

Lesson 5 : Integrating Sensors on Ultra96 with Peta Linux

Learning with ELement14 Continues

Regards

Prashanth Kumar G N