My board is an Atmel AT91SAM9263-EK.

I am trying to run the "getting started" application from the Atmel software package. I am getting it to cross-compile correctly but I get a "segmentation fault" error when I run it on the target (Linux 2.6.22.9).

The error occurs when accessing any of the board's registers, for instance:

fprintf(stdout, ", Chip ID : 0x%08X\n\r", AT91C_BASE_DBGU->DBGU_CIDR); //this bombs out

AT91C_BASE_PITC->PITC_PIMR = period? (period * pit_frequency + >> 4 : 0; //this bombs out as well




What am I missing?

Thanks,

Carlos

I don't like answering my own post, but I am pretty sure now that those examples are not Linux compatibles, as they access memory and interrupts registers directly.

Have to work on Linux kernel drivers to obtain the same functionality.

Someone correct me if I'm wrong, though!

Carlos

It looks like you are correct. Because of the MMU hardware registers can't be accessed directly from user space.
If you look at http://www.simtec.co.uk/appnotes/AN0014/ there is a decription of how to write to hardware from user space. This saves having to write Linux drivers which can be time consuming if you are not familiar with them.

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