Hi, 
 
We are porting the eCos to the embedded 
microprocessor MPC823,as everyone know,the most improtant port is the HAL,but I 
can not find the syntax rules on how to write the assemble code in HAL. 
e.g. What do "I" mean in code:
 
        asm 
volatile ("mfspr %0, %1;" : "=r" (_v_) : "I" (_spr_));
 
 
The question is  where I can find 
the detailed documents about it.
Thank you in advance.