EmbeddingGemma 2: an open, lightweight multimodal embedding model
deepmind.google·6d ago
AI Engineering
Lobsters·Aug 8·5 min read
experiments with isolation on blue pill
TL;DR
A semi-hypervisor for the Cortex-M3 microcontroller, specifically the Blue Pill, was developed to provide isolation despite the absence of advanced features like TrustZone. This approach utilizes the Memory Protection Unit (MPU) and execution modes to manage hardware access securely.
✦ Why It Matters
Consider implementing similar isolation techniques in your microcontroller projects to enhance security.
Key Takeaways
- Utilize the MPU for region-based memory protection.
- Implement a bootloader to manage application access.
- Define application capabilities through a manifest.
- Monitor application health with a watchdog mechanism.
How It Works
The architecture leverages the Cortex-M3's MPU to create isolated memory regions for applications. The bootloader-supervisor initializes the system, sets up the MPU, and controls access to hardware.
Applications run in unprivileged mode, with their access strictly defined by the supervisor, ensuring that they cannot interfere with critical system functions.