Dear Julien, in message <3C99BBA3.8090703 at thales-bm.com> you wrote: > > the kernel we have build is based on the ADS8260 board which is quite > similar to our board.
Well, is your firmware also similar to that on the ADS8260? The bootstrap loader provides the interface between firmware and kernel - so it must match BOTH sides for a given board. > the boot-loader we use is the "mbx" boot loader which come with the > Linux kernel tree. Ummm... did you adap this for your board? > - at some point in this function "serial_init" , the PC (program > counter) begins to count downwards !!! for exemple ( 0x400000 ... > 0x3ffffc ... 0x3fff8 ... ) This just means you crashed the CPU. > another point is: when debugging C source code (in emacs + gdb), > we can see that the programms jumps from one point to another (some > times backward) , not following the logical flow of the C source code > .Is that normal ???? With optimized code, yes. The compiler does several things when optimizing which can change the order of the assembler instructions from what you might expect when reading/writing C code. The "jump around" is the consequence. > what could be the reason of such behaviour ??? Optimization performed by the compiler. > does someone here have an idea for our problem ????? Well, my recommendation is to get rid of all this stuff in the mbxbot directory and use PPCBoot as firmware instead; but I'm obviously biased, and YMMV. Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de "He was so narrow minded he could see through a keyhole with both eyes ..." ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
