> From: Andrea Galbusera [mailto:[email protected]]
>
> Could you please post the exact source code of your test
> program and the steps you take to (a) build the SDK and (b)
> build your test executable? Is your running image a pretty
> standard one (core-image-minimal, rpi-test-image or so) or do
> your own with custom features?
It did have some custom features, so I did a plain build of core-image-minimal
using raspberrypi3 as the MACHINE. I also did a populate_sdk for it, and
installed the SDK in /opt/poky/2.2.1-a32 by running the install script.
The test program test.c is just "int main(void) { return 0; }". I normally use
Eclipse CDT to compile native programs, so I set up a cross project using the
SDK, which involves a few manual settings, including telling it the tools are
in /opt/poky/2.2.1-a32/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux,
and adding a --sysroot to the command lines. The compiler command line came out
as:
arm-poky-linux-gcc
--sysroot=/opt/poky/2.2.1-a32/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi
-O3 -Wall -c -mfloat-abi=hard -MMD -MP -MF"test.d" -MT"test.o" -o "test.o"
"../test.c"
(without the line breaks). I had to add "-mfloat-abi-hard" to get it to link.
The link command line was:
arm-poky-linux-gcc
--sysroot=/opt/poky/2.2.1-a32/sysroots/cortexa7hf-neon-vfpv4-poky-linux-gnueabi
-s -o "test" ./test.o
(again, without the line breaks). After dd-ing the image to my SD card, I
mounted it and manually copied the "test" program into its rootfs. When I stuck
it in the RPi3 and ran it, I got
-sh: ./test: not found
The shell in this case is busybox, so the error message is slightly different
from bash.
I rechecked everything I had described before, analyzing the executable and
comparing it to some working executable from the rootfs. There must be
SOMETHING in my executable that the loader is barfing on, after it's
successfully opened the file but before it starts looking for libraries. But
it's an awfully small executable, so it's hard to imaging where that something
is hiding.
--
Ciao, Paul D. DeRocco
Paul mailto:[email protected]
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