PM9G45

PM9G45 is a System-on-module (SoM) board in SODIMM204 format designed for embedded applications. PM9G45 is using the Microchip (ATMEL) AT91SAM9G45 CPU with an ARM926EJ CPU running at 400MHz Product Info: https://ronetix.at/product/pm9g45-cpu-module-with-atmel-at91sam9g45 Information about at91bootstrap, U-BOOT, Linux can be found here: https://www.linux4sam.org/bin/view/Linux4SAM/GettingStarted#Getting_Started_SAM9

Building at91bootstrap - second level bootloader for PM9G45

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

Install and setup the cross-compiler and CPU architecture

$ cd ~
$ mkdir bin
$ wget http://download.ronetix.at/toolchains/crosstool-ng/arm-ronetix-eabi-11.1.0.tar.gz
$ tar xvfz arm-ronetix-eabi-11.1.0.tar.gz --directory bin
$ export ARCH=arm
$ export CROSS_COMPILE=~/bin/arm-ronetix-eabi-11.1.0/bin/arm-ronetix-eabi-

Clone the latest revision of the repo

$ git clone [email protected]:ronetix/at91bootstrap.git -b at91bootstrap-3.10.4_rnx
$ cd at91bootstrap

Configure and build for booting of U-BOOT

$ make pm9g45_nf_uboot_defconfig
$ make

Configure and build for booting of Linux Kernel

$ make pm9g45_nf_linux_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 PM9G45

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 AT91SAM9G45 is maintained by Microchip: https://github.com/linux4microchip/buildroot-mchp

Buildroot can build:

• at91bootstrap
• U-Boot
• Linux kernel
• 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/ronetix/buildroot-mchp.git

$ cd buildroot-mchp
$ git checkout buildroot-at91-linux4microchip-2024.10 -b buildroot-at91-linux4microchip-2024.10

Build

$ make pm9g45_defconfig
$ make

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

• at91bootstrap.bin
• rootfs.tar
• u-boot.bin
• zImage
• pm9g45.dtb
• rootfs.ubi
• rootfs.ubifs

Customizing Buildroot

AT91Bootstrap

$ make at91bootstrap3-menuconfig

U-BOOT

$ make uboot-menuconfig

Linux Kernel

$ make linux-menuconfig

RootFs

$ 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.

Address	Image	Note
0x00000000	boot.bin	at91bootstrap
0x00020000	u-boot.bin	U-BOOT, third level bootloader
0x00180000	pm9g45.dtb	Device tree for Linux Kernel
0x00200000	zImage	Linux Kernel
0x00800000	rootfs.ubi	Root file system