Hi Simon,
Reading the Cortex-M3 Technical Reference Manual (DDI0337E) it certainly
would be good idea to use the SVC instruction to cause a context switch.
For those interested SVC is similar to SWI in other micros. The manual
has a suggested method for context switch which we should follow. The
eCos scheduler determines which thread to run and the ARM example code
would switch it.
Keith
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