[ECOS] interrupt processing in RedBoot

[Jani Monoses]

> Reason:
> I already have created a working CHAR_DEVIO driver and
> tested using the eCOS kernel, but also need to add
> this to redboot due to the speed of the boot process.
> 
> Recommendations?

You don't need the whole kernel to handle interrupts. Just use the interface implemented 
in drv_api.c. Look in redboot/src/syscall.c for an example of cyg_drv_interrupt use in 
redboot.
To make sure interrupts work in non-kernel configs on your target try a minimal template 
build and run tests/hal/common/intr.c

Jani

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