I want port free rtos use ARM Developer Suite 1.2,but the compiler have some limit: it can’t modify "SP" value when use inline assemble,  so i can’t write "portRESTORE_CONTEXT" and "portSAVE_CONTEXT" in c code;it can’t support a function to be "nake" or "task". how can i do? kevin

This is the second message in two days on this.  Is this to do with the new Keil/ARM combined offering? I think in RVDS you can write assembly functions directly in C code just by placing an asm (or __asm?) before the function. eg asm void aFunction( void ) {     asm statements go here }

Though i can write assmbly function directly in C code, but can’t direct access "SP","LR" register, so i can’t use inline assembly MACRO in C code, because some freertos code like "portRESTORE_CONTEXT", "portSAVE_CONTEXT" "portENTER_SWITCHING_ISR" direct use "SP" "LR" register, how can i do? kevin

If this is a hard limitation in the compiler then it is going to be difficult.  Are there any modes of operation where it allows access?  It seems very restrictive.

Have you figured out the solution for this yet? I am having the same problem.

Have a look at the files in FreeRTOSSourceportableRVDSARM_CM3.  These use RVDS but are not for the ARM7. But I’m sure you could copy how it was done.