Altair

RISC-V Foundation for Embedded Systems

Altair defines a standardized RISC-V execution environment for microcontroller-class embedded systems. It specifies mandatory and optional ISA extensions, privilege models, and system-level assumptions to guarantee long-term binary compatibility across implementations.

By reducing architectural variation, Altair enables reusable software stacks, predictable real-time behavior, and a scalable embedded RISC-V ecosystem.

Defined ISA Profile

Clear definition of mandatory and optional RISC-V extensions to eliminate fragmentation.

Stable Privilege Model

Standardized use of Machine and optional User modes for consistent RTOS and firmware behavior.

Binary Compatibility First

Ensures compiled binaries run unchanged across compliant Altair implementations. 

Embedded-Optimized Scope

MCU-class focus without unnecessary complexity or high-end architectural overhead.

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