Regarding 'set architecture <arch name>

[Andrew Cagney]

> Hi,
> 
> We have added new target in simulator. But the target will not reflect
> for the disassembler.
> If we are setting the architecture name explicitly using 'set
> architecture <architecture name>', then the disassembler works for my
> new target. If I invoke the command 'set architecture <tab>', my new
> target doesn't display in the supported architecture name list. Why we
> have to set the architecture explicitly ? Is this GDB design or any
> changes required in disassembler configuration to support the current
> target?

GDB gets its list of known arch:mach pairs from BFD.  If your machine 
doesn't appear I'd start by checking BFD.

Andrew