CPU Variants

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Tim 'mithro' Ansell edited this page Jul 5, 2019 · 2 revisions

export CPU_VARIANT=XXXX

FULL_CPU value is $CPU.$CPU_VARIANT.

Current Variants

lm32

mor1kx

linux - openrisc with features required for Linux enabled.

Possible CPU Variants

Minimal - smallest possible resource usage version of the CPU

Metal - CPU configured for "bare metal" firmware. No MMU, syscall, etc stuff

OS - CPU configured to run a real OS such as Linux. Will have MMU and caches. OS configure expects SDRAM

Size - optimise for smallest resource usage
- Balanced - enable performance features which have a good resource to performance ratio
- Performance - enable all features which increase performance
+Debug - enable features which increase debug