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Sama5d27Som1-EK

Last modified by Microchip on 2025/11/21 15:22

SoC Features

The SAMA5D2 series is a high-performance, ultra-low-power ARM Cortex-A5 processor based MPU. The Cortex A5 processor runs up to 500MHz and features the ARM NEON SIMD engine a 128kB L2 cache and a floating point unit. It supports multiple memories, including latest-generation technologies such as DDR3, LPDDR3, and QSPI Flash. It integrates powerful peripherals for connectivity (EMAC, USB, dual CAN, up to 10 UARTs, etc.) and user interface applications (TFT LCD controller, embedded capacitive touch controller, class D amplifier, audio PLL, CMOS sensor interface, etc.). The devices offer advanced security functions to protect customer code and secure external data transfers. These include ARM TrustZone, tamper detection, secure data storage, hardware encryption engines including private keys, on-the-fly decryption of code stored in external DDR or QSPI memory and a secure boot loader.

sama5d2.png

Kit Information

Kit Overview

The SAMA5D27 SOM1-EK documents can be found on microchip website, as following:

Kit Overview

SAMA5D27 SOM1 EK

Access the console

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Access the console on JLINK micro-A USB connector (J10)

The serial console can be accessed from the micro-A USB connector that gives access to the on-board serial-to-USB converter (marked as J10 JLINK). In fact, the ATSAM3U chip on the Evaluation Kit acts as a serial-to-USB converter and is loaded with a firmware that is able to talk USB-CDC protocol.

  • For Microsoft Windows users: Install the J-Link CDC USB driver. No need to install a driver on any regular Linux distribution.
  • Connect the USB cable to the board (J10 JLINK)
    • For Microsoft Windows users: identify the USB connection that is established
      JLINK CDC UART Port should appear in Device Manager. The COMxx number will be used to configure the terminal emulator.
      JLINK CDC UART Port
    • For Linux users: identify the USB connection by monitoring the last lines of dmesg command. The /dev/ttyACMx number will be used to configure the terminal emulator:
      usb 1-1.2.2.4: new high-speed USB device number 33 using ehci-pci
      usb 1-1.2.2.4: config 1 interface 1 altsetting 0 bulk endpoint 0x83 has invalid maxpacket 64
      usb 1-1.2.2.4: config 1 interface 1 altsetting 0 bulk endpoint 0x4 has invalid maxpacket 64
      usb 1-1.2.2.4: New USB device found, idVendor=1366, idProduct=0105
      usb 1-1.2.2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
      usb 1-1.2.2.4: Product: J-Link
      usb 1-1.2.2.4: Manufacturer: SEGGER
      usb 1-1.2.2.4: SerialNumber: 000483029109
      cdc_acm 1-1.2.2.4:1.0: ttyACM0: USB ACM device
  • Now open your favorite terminal emulator with appropriate settings

Demo

Demo archives

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Build From source code

Setup ARM Cross Compiler

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Build AT91Bootstrap from sources

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Assuming you are at the AT91Bootstrap root directory, you will find a configs folder which contains several default configuration files:

sama5d27_som1_ekqspi_uboot_defconfig
sama5d27_som1_eksd_uboot_defconfig
Information

Tips: qspi means to read quad-SPI serial flash, sd means to read mmc card.

You can configure AT91Bootstrap to load U-Boot binary from SD Card by doing:

$ make mrproper
$ make sama5d27_som1_eksd_uboot_defconfig

If the configuring process is successful, the .config file can be found at AT91Bootstrap root directory.

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Build U-Boot from sources

Getting U-Boot sources

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Cross-compiling U-Boot

Before compiling the U-Boot, you need setup cross compile toolchain in the section.

Warning

Latest versions of U-boot (2018.07 and newer) have a minimum requirement of 6.0 version of the GCC toolchain. We always recommend to use the latest versions.

Once the AT91 U-Boot sources available, cross-compile U-Boot is made in two steps: configuration and compiling. Check the Configuration chapter in U-Boot reference manual.

Information

 Go to the configs/ to find the exact target when invoking make.

The U-Boot environment variables can be stored in different media, above config files can specify where to store the U-Boot environment.

   # To put environment variables in quad-SPI serial flash:
   sama5d27_som1_ek_qspiflash_defconfig
  # To put environment variables in SD/MMC card:
   sama5d27_som1_ek_mmc_defconfig

Here are the building steps for the SAMA5D27-SOM1-EK board:

# You can change the config according to your needs.
make sama5d27_som1_ek_mmc_defconfig
make

The result of these operations is a fresh U-Boot binary called u-boot.bin corresponding to the binary ELF file u-boot.

  • u-boot.bin is the file you should store on the board
  • u-boot is the ELF format binary file you may use to debug U-Boot through a JTag link for instance.

Build Kernel from sources

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Now we Configure and Build kernel for sama5d27som1ek board:

$ make ARCH=arm sama5_defconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/zconf.lex.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
#
# configuration written to .config
#

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Build Yocto Project rootfs from sources

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