On 23:28 Tue 07 Jul , Wolfgang Denk wrote: > Dear Jean-Christophe PLAGNIOL-VILLARD, > > In message <20090707202432.gk30...@game.jcrosoft.org> you wrote: > > > > > > + * These macros provide a convenient way to write 8, 16 and 32 bit data > > > > + * to any address. > > > > > > I think this comment might be wrong. It should probably read "... to > > > any _memory_ address". Using these macros to access device registers > > > and the like is probably nore recommended? > > you can access cpu register without problem with these macros > > Is it guaranteed that none of the existing ARM architectures and all > the plethora of their specific implementations of the zillions of > SoCs do not require any form of memory barrier instructions when > accessing device registers? Even when these are external peripherals > on some external bus? > > Sorry for such a stupid question about things that are eventually > obvious to you, but I don't know ARM processors that well... you may need it in specific case as cache, tlb, co-processor or smp otherwise you do not need it
so normaly no-need for register access Best Regards, J. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
