SK-AM64
Overview
The SK-AM64 board configuration is used by Zephyr applications that run on the TI AM64x platform. The board configuration provides support for the ARM Cortex-M4F MCU core and the following features:
Nested Vector Interrupt Controller (NVIC)
System Tick System Clock (SYSTICK)
The board configuration also enables support for the semihosting debugging console.
See the TI AM64 Product Page for details.
Hardware
The SK-AM64 EVM features the AM64 SoC, which is composed of a dual Cortex-A53 cluster and a single Cortex-M4 core in the MCU domain. Zephyr is ported to run on the M4F core and the following listed hardware specifications are used:
Low-power ARM Cortex-M4F
Memory
256KB of SRAM
2GB of DDR4
Debug
XDS110 based JTAG
Supported Features
The sk_am64 board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
Clock control |
on-chip |
Generic fixed-rate clock provider1 |
|
GPIO & Headers |
on-chip |
GPIO Controller for Davinci and Keystone devices1 |
|
I2C |
on-chip |
TI OMAP I2C Controller2 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
Mailbox |
on-chip |
TI OMAP MAILBOX1 |
|
Pin control |
on-chip |
TI K3 Pin Controller1 |
|
Serial controller |
on-chip |
||
SRAM |
on-chip |
Generic on-chip SRAM description3 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
Devices
System Clock
This board configuration uses a system clock frequency of 400 MHz.
DDR RAM
The board has 2GB of DDR RAM available. This board configuration allocates Zephyr 4kB of RAM (only for resource table: 0xa4100000 to 0xa4100400).
Serial Port
This board configuration uses a single serial communication channel with the MCU domain UART (MCU_UART0).
GPIO
The SK-AM64 has a heartbeat LED connected to MCU_GPIO0_6. It’s configured to build and run the Blinky sample.
SD Card
Download TI’s official WIC and flash the WIC file with an etching software onto an SD card. This will boot Linux on the A53 application cores of the EVM. These cores will then load the zephyr binary on the M4 core using remoteproc.
The default configuration can be found in boards/ti/sk_am64/sk_am64_am6442_m4_defconfig
Flashing
The board can using remoteproc, and uses the OpenAMP resource table to accomplish this.
The testing requires the binary to be copied to the SD card to allow the A53 cores to load it while booting using remoteproc.
To test the M4F core, we build the Hello World sample with the following command.
# From the root of the Zephyr repository
west build -p -b sk_am64/am6442/m4 samples/hello_world
This builds the program and the binary is present in the build/zephyr directory as
zephyr.elf.
We now copy this binary onto the SD card in the /lib/firmware directory and name it as
am64-mcu-m4f0_0-fw.
# Mount the SD card at sdcard for example
sudo mount /dev/sdX sdcard
# copy the elf to the /lib/firmware directory
sudo cp --remove-destination zephyr.elf sdcard/lib/firmware/am64-mcu-m4f0_0-fw
The SD card can now be used for booting. The binary will now be loaded onto the M4F core on boot.
To allow the board to boot using the SD card, set the boot pins to the SD Card boot mode. Refer to SK-AM64B EVM User’s Guide.
After changing the boot mode, the board should go through the boot sequence on powering up. The binary will run and print Hello world to the MCU_UART0 port.