i.mx 7 - Hetereogenous Multiprocessing Architecture
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1 i.mx 7 - Hetereogenous Multiprocessing Architecture
2 Overview Toradex Innovative Business Model Independent Companies Direct Sales Publicly disclosed Sales Prices Local Warehouses In-house HW and SW Development Free Support by the Developers 10+ Year Product Life Cycle
3 Toradex Product Families Two complementary, pin-compatible product families targeting industrial applications: Apalis: MXM3-type small-form-factor SOM High-performance product family High-speed interface support: PCIe, GigE, SATA, USB 3.0, HDMI, edp, MIPI CSI/DSI, etc. Advanced multimedia support with HD 3D Graphics and multiple Display and Camera ports Colibri: SODIMM small-form-factor SOM Cost/performance optimized product family Common industrial interface support: Ethernet, UART, SPI, I2C, RGB/LVDS display, etc. Hugely popular for over 10 years
4 Build a self-balancing Robot with a Graphical User Interface Requirements Robot needs to balance on two wheels User Interface should act on changes in balance Challenges Balancing Inertial sensors, motor control Closed loop controller (real-time) User Interface... Resolution, Animations Communication? 4
5 Robot: Traditional approach Gyroscope Accelerometer I2C Distance Sensor I2C Controller HID Analog PWM SoC UART/SPI/I2C Real-time OS Closed Loop Controller Full-featured OS UI-Framework PWM + GPIO Motor Driver (Wheel) SDIO USB Microcontroller Servos (Arms) WiFi Parallel RGB Motor Driver (Wheel) LCD Display 5
6 NXP i.mx 7 Heterogeneous Multiprocessing Architecture Multiprocessing Two independent CPU cores in a single Chip Heterogeneous Do not use the same ISA (almost though) ARM Cortex-A7@1GHz (two in the i.mx 7D case) ARM Cortex-M4@200MHz Shared Bus Topology 6
7 NXP i.mx 7 Heterogeneous Multiprocessing Architecture Main CPU Platform Secondary CPU Platform Heterogeous Multicore Units Cortex-M4 Resource Domain Controller (RDC) Core #0 (Cortex-A7) Core #1 (Cortex-A7) 32 KB I-cache 32 KB D-cache FPU NEON 512 KB L2-cache 16 KB I-cache 16 KB D-cache Messaging Unit (MU) FPU MPU Semaphore (SEMA4/SEMA42) 32 KB TCML 32 KB TCMU AXI/AHB Interconnect Internal Memory External Memory Peripherals 96 KB ROM DDR Controller UART GPIO 128 KB OCRAM GPMI&BCH (NAND) ADC CAN I2C SPI PWM KB OCRAM_S... 7
8 NXP i.mx 7 HMP Applications Offload Real-time Tasks Real-time Operating System on Cortex-M4 Optimize Power Powerdown main CPU and its peripherals Keep DDR memory in Self-Refresh Increase Security Run Secure world only on one CPU complex Hardware partitioning of peripherals 8
9 NXP i.mx 7 HMP Advantages Fast communication between the two systems Simple Firmware upgrade Less Hardware Cost savings Availability Dynamic hardware Reallocation of Devices as Software evolves 9
10 Robot: HMP Approach Gyroscope Accelerometer I2C Distance Sensor I2C Analog NXP i.mx 7 Cortex-M4 Servos (Arms) PWM Real-time OS Closed Loop Controller Controller HID USB Cortex-A7 Full-featured OS UI-Framework Parallel RGB PWM + GPIO Motor Driver (Wheel) Motor Driver (Wheel) LCD Display WiFi SDIO
11 Balancing Robot TAQ 11
12 Demo
13 Robot: Software Stack Main CPU Platform Linux/Boot2Qt root file system Qt 5 User Interface Secondary CPU Platform FreeRTOS with Custom Firmware Communication Linux Rpmsg with Rpmsg based TTY driver FreeRTOS OpenAMP (bare-metal Rpmsg implementation) 13
14 Robot: Software Architecture
15 Robot: Simple Line-Based Protocol Implemented commands:?angle?speedleft?speedright?distance?voltage!move value!turnleft value!turnright value!stop!servo nr, value 15
16 HMP History NXP Vybrid: MQX, MCCv1 (Multi-Core Communcation) Kernel driver User-space Library CPU2CPU interrupts NXP i.mx 6 SoloX: MQX, MCCv2 Using Messaging Unit (MU) NXP i.mx 7: FreeRTOS, Rpmsg Kernel drivers 16
17 Boot flow The system (boot ROM) always starts on Cortex-A7 Cortex-M4 is clock gated Vector base is in OCRAM_S (0x ) U-Boot implements custom command bootaux fatload mmc 0:1 0x7F8000 hello_world.bin dcache flush bootaux 0x7F8000 Image Format: First word: Initial stack pointer Second word: Entry point 17
18 Software Stack in detail Linux Kernel NXP Beta BSP Linux based (+ ~2.4k patches) NXP Final BSP Linux based (+ ~1.6k patches) FreeRTOS FreeRTOS v8.0.0 kernel Various build systems supported (DS-5, CMake + gcc, IAR) Modified version of OpenAMP Drivers: ADC, GPIO, I2C, UART, WDOG, ECSPI, FlexCAN Some Mainline Support (starting with 4.4) 18
19 Remoteproc/Rpmsg Frameworks Upstream Linux Frameworks to support HMP systems Introduced in Linux 3.3 around 2011 (Ohad Ben-Cohen) Remoteproc: Remote Processor management Framework Currently no implementation for i.mx 7 Loading firmware Starting/Stopping the (remote) Processor Allocating and providing resources (e.g. memory) Setting up VirtIO devices 19
20 Rpmsg: Remote Processor Messaging Framework Used as communication Framework for i.mx 7 Rpmsg is a VirtIO driver (VIRTIO_ID_RPMSG 7) Bus driver (in the Linux driver framework) Each endpoint has a callback Endpoint created for each Rpmsg driver Created with control messages in mind Fixed message size of 512 bytes i.mx 7 specific VirtIO driver, making use of Messaging Unit 20
21 Rpmsg: Drivers 2 Rpmsg based Kernel drivers provided by NXP Pingpong (CONFIG_IMX_RPMSG_PINGPONG, drivers/rpmsg/imx_rpmsg_pingpong.c) In Kernel test driver Sends back a message upon message reception Serial Port (CONFIG_IMX_RPMSG_TTY, drivers/rpmsg/imx_rpmsg_tty.c) TTY driver (/dev/ttyrpmsg) One message per write Use it like a regular TTY (open/read/write/close) 21
22 Rpmsg: OpenAMP Rpmsg implementation for bare-metal firmware and RTOS Started by Mentor Graphics, Xilinx and NXP Open source project on Github BSD License VirtIO implementation of FreeBSD RTOS-aware extension of RPMsg API by NXP Blocking, sequential API Like sockets but locally and zero-copy! 22
23 Rpmsg: Example OpenAMP/RTOS API struct remote_device *rdev = NULL; struct rpmsg_channel *app_chnl = NULL; void *rx_buf; int len; unsigned long src; /* Init */ rpmsg_rtos_init(0, &rdev, RPMSG_MASTER, &app_chnl); /* Receive */ rpmsg_rtos_recv_nocopy(app_chnl->rp_ept, &rx_buf, &len, &src, 0xFFFFFFFF); /* Process data in rx_buf... just sending them back... */ tx_buf = rpmsg_rtos_alloc_tx_buffer(app_chnl->rp_ept, &size); memcpy(tx_buf, rx_buf, len); rpmsg_rtos_send_nocopy(app_chnl->rp_ept, tx_buf, len, src); /* Free Receive buffer */ rpmsg_rtos_recv_nocopy_free(app_chnl->rp_ept, rx_buf); 23
24 Resources Balancing Robot TAQ Firmware (soon) Balancing Robot TAQ User Interface Toradex Developer Article FreeRTOS on the Cortex-M4 of a Colibri imx7 Linux Kernel Sources Documentation/rpmsg.txt OpenAMP FreeRTOS BSP (including NXP documentation) Release Notes, Getting Started, API Reference Manual 24
25 Stefan Agner +1 (206)
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