On Wed, 17 Nov 2010 20:15:01 +0100 Joakim Tjernlund <joakim.tjernl...@transmode.se> wrote:
> Scott Wood <scottw...@freescale.com> wrote on 2010/11/17 20:03:25: > > The "load, conditional branch, isync" sequence is documented in the > > architecture manual (1.7.1), "even if the effects of the 'dependency' > > are independent of the value loaded". > > So it doesn't matter what address you do twi on? > Still, it would make a little more sense if > it read twi 0,r3,0 It's not an address, it's data that is being compared with zero. And it has to be r4, since that's what you want to create the data dependency on. The architecture suggests a similar but slightly longer sequence (but I don't think the wording rules out using twi), which may make the intent clearer: lwz r4, ... cmpw r4, r4 beq 1f 1: isync -Scott _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
