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Michael -- On Tue, Mar 5, 2013 at 2:05 PM, Michael Powell <mwpowellhtx@gmail.com> wrote: > Hello, > > Targeting Linux ARM (ArchLinux kernel 3.7.1). > > I have a simple Hello World type app, that's all it does, cout << > "Hello, World!" << endl and that's it. That one works when I cross > compile and run it on the target. > > Then I work int some more elaborate functionality involving I2C > features, and I get segmentation fault. The best option here is if you can get a backtrace with the debugger. If you managed to build a native gdb, try running the offending program under gdb on the device. If you didn't get a native gdb, you can use a cross gdb, but it takes a bit more work. (And it's related to the shenanigans we need to do for cross-ldd -- the location of the dynamic libraries is relative to root at runtime; for your device binaries, that's the root filesystem image that it is booted with, not the root filesystem on your development host!) Again, using my setup, I can get a stack / backtrace by using the cross-gdb on my devel host by doing something like this: $ cd /opt/cross/PLATFORM/live $ ../xtools/bin/TARGET_gdb bin/my-main-app core (gdb) set sysroot . (gdb) bt > Not familiar with this phenomena, per se. I have verified, and our > target's kernel version is 3.7.1, while the cross compiler was built > for 3.7.3. > > It's possible I need to have built the cross compiler to target kernel > 3.7.1 to agree with the target? It's more likely that you're using the host copies of i2c-dev.h, and there's something in there (endian tests? who knows!) that is not the same on ARM. You really do need to configure/install the i2c-tools correctly for the target, instead of trying to use the host-native bits. Good luck, Tony -- For unsubscribe information see http://sourceware.org/lists.html#faq
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