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Fatal error: Invalid -march= option:`armv5t'

Hi,I use DM6467T and load the mvl_5_0_0801921_demo_sys_setuplinux.bin in the linux.

When I build my program (use gcc path:montavista/pro/devkit/arm/v5t_le/bin/arm_v5t_le-gcc),it deplay as follows:

Assembler messages:
Fatal error: Invalid -march= option: `armv5t'

 

I cann't understand why?

How to do?