[ECOS] ecos crashes when using "nop" instead of "wfi"

[Cyrill Künzle]

I'm using the ST STM3210E EVAL board default configuration and running from rom.
I changed in the hal_arch.h the line from

#define HAL_IDLE_THREAD_ACTION(__count) __asm__ volatile ( "wfi\n" )

into

#define HAL_IDLE_THREAD_ACTION(__count) __asm__ volatile ( "nop\n" )

I changed the timer as following:

- I use 2 Timers running with 10ms
- I added a busy wait in the isr of the two timers
- I toggle some pins

The result is that after a short time the test crashes.

Thanks
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