SAM9X5-CM
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SAM9X5-CM is a System-on-module (SoM) board in SODIMM204 format designed for embedded applications. SAM9X5-CM is using the Microchip (ATMEL) AT91SAM9x5 CPU with an ARM926EJ CPU running at 400MHz Product Info: https://ronetix.at/product/sam9x5-cm-cpu-module-with-atmel-at91sam9x5-series
Information about at91bootstrap, U-BOOT, Linux can be found here: |
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Building at91bootstrap - second level bootloader for SAM9X5-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 https://github.com/ronetix/at91bootstrap.git -b at91bootstrap-3.10.4_rnx $ cd at91bootstrap
Configure and build
$ make sam9x5_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 SAM9X5-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 SAM9X5 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
The Host build system should be a Linux system with necessary software installed:
http://www.buildroot.net/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
$ mkdir buildroot-ronetix $ cd buildroot-ronetix $ git clone https://github.com/linux4microchip/buildroot-mchp.git $ git clone https://github.com/ronetix/br2-external-ronetix.git
$ cd buildroot-mchp $ git switch -c linux4microchip-2026.04 linux4microchip-2026.04
Build
$ make BR2_EXTERNAL=../br2-external-ronetix sam9x5_cm_defconfig $ make
Build Results
Once compilation is done, the images have been generated in: ./output/image:
- at91bootstrap.bin
- rootfs.tar
- u-boot.bin
- zImage
- at91sam9g15ek.dtb
- at91sam9g25ek.dtb
- at91sam9g35ek.dtb
- at91sam9x25ek.dtb
- at91sam9x35ek.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 | at91sam9x35ek.dtb | Device tree for Linux Kernel |
| 0x00200000 | zImage | Linux Kernel |
| 0x00800000 | rootfs.ubi | Root file system |
Programming with SAM-BA 3.x
$ sam-ba -p usb -b sam9xx5-ek -a lowlevel $ sam-ba -p usb -b sam9xx5-ek -a extram $ sam-ba -p usb -b sam9xx5-ek -a serialflash -c erase:0:0x10000 $ sam-ba -p usb -b sam9xx5-ek -a nandflash -c erase $ sam-ba -p usb -b sam9xx5-ek -a nandflash -c writeboot:boot.bin $ sam-ba -p usb -b sam9xx5-ek -a nandflash -c write:u-boot.bin:0x40000 $ sam-ba -p usb -b sam9xx5-ek -a nandflash -c write:at91sam9x35ek.dtb:0x180000 $ sam-ba -p usb -b sam9xx5-ek -a nandflash -c write:zImage:0x200000 $ sam-ba -p usb -b sam9xx5-ek -a nandflash -c write:rootfs.ubi:0x800000
More information about SAM-BA 3.x can be found here:
https://www.linux4sam.org/bin/view/Linux4SAM/Samba3Subsections