GCC Compiler Switch

Altera_Forum · ‎05-31-2004

Hi,

I want to force the Nios II GCC compiler to use a 32-bits memory location for any variable (alt_u32, alt_u16, alt_u8, etc).

Is there a GCC compiler switch to do this trick?

Best Regards,

Marco

Altera_Forum · ‎05-31-2004

Hello Marco,

I don't know if there is a switch in GCC but you could change the typedefs in "alt_types.h" for each type to 32-bit. That would be quick and dirty way.

Bye,

niosIIuser

Altera_Forum · ‎06-02-2004

Hi niosIIuser,

Unfortunately this trick does not work. The reason why I'm asking is the fact that I have a memory perpipheral that only supports 32 and 16 bits (word aligned) access. The Nios II runs code and data from this peripheral without any troubles, but if I uncheck the system library option 'Small C Library' or 'Reduce Device Drivers' the printf output is corrupted or nothing. So I thought that aligning the variables to a word boundary maybe could solve the problem.

Any other ideas?

Best Regards,

Marco