On Mon, Jul 11, 2011 at 12:45 PM, Drasko DRASKOVIC <drasko.drasko...@gmail.com> wrote: > On Mon, Jul 11, 2011 at 11:53 AM, Øyvind Harboe <oyvind.har...@zylin.com> > wrote: >> I think there is a fundamental misunderstanding about JTAG >> and OpenOCD. >> >> Let me try to clarify: >> >> JTAG clocks in and out bits, not bytes, so the concept of >> "big/small-endian" does not enter the picture at the JTAG level. > > Sat that we have 0x12345678 at addr 0x0 on LE host. > You will shift out byte 0x78 first, shifting out from LSB upwards.
You're on the wrong track here. Shifting out happens with *bits*. So the situation is: - you have a host word. 8, 16, 32 or 64 bit wide. - that word must be copied over to an array of bytes to be shifted out. At this point any memory of host representation is gone. - the jtag layer now shifts out the bits, starting with bit 0 in byte 0. - the target receives the bits in order completely oblivious to how you put them on the wire. -- Øyvind Harboe - Can Zylin Consulting help on your project? US toll free 1-866-980-3434 / International +47 51 87 40 27 http://www.zylin.com/ _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
