Tag Archives: m4boot

Vybrid Cortex-M4 Linux support – Status update

Vybrid Cortex-M4 Linux boot log

Vybrid Cortex-M4 Linux boot log

This is a status update about my work on Linux for Cortex-M4 inside Freescale Vybrid SoC’s. While I managed to boot Linux on the M4 core since fall last year, several improvements have been made since then.

MSCM interrupt router driver

Peripheral interrupts need to be routed to the core requiring them. The routing is done by the interrupt router inside MSCM (Miscellaneous System Control Module). So far, the boot loader (U-Boot) configured all interrupts to the primary core. A proper driver for the interrupt router was missing, hence to get Linux running on the secondary core, manual fiddling of the interrupt router registers was needed. Read more »

Make it two: Tuxes on one SoC

Vybrid SoC

Vybrid SoC running two Linux instances

In earlier posts I already wrote about Vybrid, a Freescale ARM SoC consisting of one Cortex-A5 and one Cortex-M4 (microcontroller) CPU. Normally, one would run a Firmware on the Cortex-M4 and Linux on the Cortex-A5 (which is quite well supported by contemporary kernels). But since we have two CPU’s with architectures supported by Linux (ARMv7-A and ARMv7-M), so why not running two independent Linux kernels in one SoC?

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