Am 21.12.2010 11:53, schrieb Wolfgang Denk: > Dear Albert ARIBAUD, > > In message<4d1083b4.2060...@free.fr> you wrote: >> >>> And I at your suggestion tried modifying the binary changing the extra >>> ldrb to a nop and it works. >> >> Seems like a compiler issue to me, as the preprocessed C source is the >> same for the register access and does not call for a re-read (that is >> what I wanted to see in the preprocessed version), yet the ASM sequence >> does the re-read. > > I also tend to think this is a compiler problem. Searching the gcc > bugzilla entries for "ldrb" turns up quite a number of hits. I'm not > sure which of these we are running into here, but there are enough of > them so you can chose freely :-(
Hmm, is there actual somethinbg which should forbid the compiler to generate such code which rereads something? It might not be nice, but I don't think that it is forbidden for a compiler to do so. So the proper way to handle such, might be to use asm to avoid that the compiler touches that register. Regards, Alexander _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
