Software Defined Hardware on Heterogeneous SoCs Using OpenAMP
summary
Prototype implements Zephyr + OpenAMP on a heterogeneous SoC (IMX8M‑Plus, target IMX93) to run flex‑IO/bit‑bang peripherals on an M‑core and expose them in Linux via RPMSG and remoteproc. It creates /dev/tsdh0 TTYs and an I²C bus, sustains two UARTs at 115200 baud in one direction, and buffers on the coprocessor to avoid Linux CPU churn. Limits: M‑core ~100 MHz, occasional RPMSG buffer stalls, added complexity versus native drivers. Open source proof‑of‑concept.
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chapters (20)
- 0:00Introduction
- 1:27Modern SoCs with flexible interfaces
- 2:56Why flexible interfaces are needed
- 4:22Challenges with vendor APIs
- 6:53Software-defined hardware
- 7:57Flexible I/O with co-processors
- 9:25Zephyr RTOS over alternatives
- 10:48OpenAMP framework
- 11:30Software-defined hardware architecture
- 12:11Sapphire and Linux separation
- 15:03Device tree configuration
- 16:08Minimal Sapphire module
- 17:14Minimal Linux kernel module
- 17:56Linux-Sapphire communication flow
- 18:59Linux interface appearance
- 19:43Live demo setup
- 24:33Prototype conclusion
- 27:47Future evolution
- 30:21Lessons learned
- 32:31Q&A
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