SAMA5D3X-CM

SAMA5D3X-CM is a System-on-module (SoM) board in SODIMM204 format designed for embedded applications. SAMA5D3X-CM is using the Microchip (ATMEL) ATSAMA5D3X CPU with a CORTEX-A5 CPU running at 536MHz Product Info: https://ronetix.at/product/sama5d3x-cm-cpu-module-with-atmel-sama5d3-series Information about at91bootstrap, U-BOOT, Linux can be found here: https://www.linux4sam.org/bin/view/Linux4SAM/Sama5d3xekMainPage

Building at91bootstrap - second level bootloader for SAMA5D3X-CM

This bootloader is based on https://github.com/linux4sam/at91bootstrap, branch at91bootstrap-3.x

Setup the cross-compiler and CPU architecture

$ export ARCH=arm
$ export CROSS_COMPILE=/opt/cross/arm-ronetix-eabi-8.3.0/bin/arm-ronetix-eabi-

Clone the latest revision of the repo

$ git clone git@github.com:ronetix/at91bootstrap.git -b at91bootstrap-3.10.4_rnx
$ cd at91bootstrap

Configure and build

$ make sama5d3x_cm_nf_uboot_defconfig
$ make

Build Results

File Name	Description
binaries/at91bootstrap.bin	BIN image, should be programmed at address 0x0
binaries/at91bootstrap.elf	ELF image used for JTAG debugging

Building Buildroot - a simple Linux System for SAMA5D3X-CM

Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation.
The home page of Buildroot is: https://buildroot.org
The Buildroot user manual can help you better understand how Buildroot works: http://www.buildroot.net/downloads/manual/manual.html
The Buildroot for SAMA5D3x is maintained by Microchip: https://www.linux4sam.org/bin/view/Linux4SAM/BuildRoot

Buildroot can build:

• at91bootstrap
• u-boot-at91
• linux-at91
• A cross-compiler
• Root filesystems of different types

Prerequisites

Host build system should be a Linux system with necessary software installed: http://buildroot.uclibc.org/downloads/manual/manual.html#requirement
In addition to these required packages, you should also install libssl-dev:

$ sudo apt-get install libssl1.0-dev

or, depending on your host distribution:

$ sudo apt-get install libssl-dev

Get sources

$ git clone https://github.com/linux4sam/buildroot-at91.git
$ git clone https://github.com/linux4microchip/buildroot-external-microchip.git

$ cd buildroot-external-microchip/
$ git checkout linux4microchip-2022.10 -b buildroot-external-microchip-linux4microchip-2022.10

$ cd ../buildroot-at91/
$ git checkout linux4sam-2022.10 -b buildroot-at91-linux4sam-2022.10

Build

$ make atmel_sama5d3xek_defconfig
$ make

Once compilation is done, the images have been generated in: ./output/image:

• at91bootstrap.bin
• rootfs.tar
• u-boot.bin
• u-boot-spl.bin
• zImage
• sama5d31ek.dtb
• sama5d33ek.dtb
• sama5d34ek.dtb
• sama5d35ek.dtb
• sama5d36ek.dtb
• rootfs.ubi
• rootfs.ubifs

Customizing Buildroot

AT91Bootstrap

$ BR2_EXTERNAL=../buildroot-external-microchip/ at91bootstrap3-menuconfig

U-BOOT

$ BR2_EXTERNAL=../buildroot-external-microchip/ make uboot-menuconfig

Linux Kernel

$ BR2_EXTERNAL=../buildroot-external-microchip/ make linux-menuconfig

RootFs

$ BR2_EXTERNAL=../buildroot-external-microchip/ make menuconfig

NAND Boot: Programming images

SAM-BA tool or PEEDI JTAG Flash Programmer can be used for programming the images into the NAND Flash.
All images should be programmed with 4-bit ECC.

Address	Image	Note
0x00000000	boot.bin	at91bootstrap, programmed with header 0xc0902405
0x00040000	u-boot.bin	U-BOOT, third level bootloader
0x00180000	sama5d35ek.dtb	Device tree for Linux Kernel
0x00200000	zImage	Linux Kernel
0x00F80000	rootfs.ubi	Root file system