Re: [Barry-devel] Cross compiling for the ARM linux

[Toby G. <tob...@re...>]

On 15/03/2011 12:31, nav...@ya... wrote:
> Hi
>
> We cross compiled and loaded the barry(static) and libusb(dynamic) libraries on to the board.
Excellent. Glad to hear you got it working.

> But when I run the usbclient application on the board we are getting below error
>
> Alignment trap: usbclient (517) PC=0x0000f9bc Instr=0xe1dc00b2 Address=0x0004140f FSR 0x001
>
> Bus error
That'll be because code somewhere is trying to load an unaligned value 
(e.g. reading a 32-bit integer from an address which isn't a multiple of 4).

Is it possible to compile barry with debug information and run within 
GDB so that we can see which source line is causing an unaligned read? 
Do you get a similar error when running a different sample or tool (such 
as 'btool -l')?

Are you using the 0.17 code or building from the git repository? If the 
latter then what's the head commit ID?

I've certainly managed to have the channel support (which usbclient 
uses) working successfully on ARM hardware. I can't remember if I had 
alignment checking enabled or disabled though and I've not used 
usbclient on ARM ever.

> Please suggest me, what could be the problem for getting above error.
It's most likely that an unsigned char* is being cast to a large type 
and then dereferenced. If you get GDB working then it should be 
immediately obvious from the line where the unaligned access comes from.
> Additionally pls explain me how to build a barry shared libraries.

I've always just configured and made barry as normal and always got 
shared libraries from it. Did you explicitly disable shared libraries 
from being build for some reason?

Regards,

Toby