The TMS320C54X version of as has a few machine-dependent options.
You can use the -mfar-mode option to enable extended addressing mode. All addresses will be assumed to be > 16 bits, and the appropriate relocation types will be used. This option is equivalent to using the .far_mode directive in the assembly code. If you do not use the -mfar-mode option, all references will be assumed to be 16 bits. This option may be abbreviated to -mf.
You can use the -mcpu option to specify a particular CPU.
This option is equivalent to using the .version directive in the
assembly code. For recognized CPU codes, see
See .version. The default CPU version is
542.
You can use the -merrors-to-file option to redirect error output to a file (this provided for those deficient environments which don't provide adequate output redirection). This option may be abbreviated to -me.