On Sat, Dec 19, 2009 at 11:40:40AM +0330, seyyed morteza havaedgi wrote: > I working on mpc8272. in the file io.h there is "twi 0,RA,0" instruction. > what this instruction means and what it does? In accordance with powerpc > programmers manual this instruction must do nothing because the TO field is > zero.
It turns a data dependency on RA into a flow control dependency (even though the decision always ends up being not to trap), which can then be ordered by a following isync. -Scott _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
