Cross compiling NSPR for an xtensa processor

Hello,
I have trying to cross compile firefox for an tensilica xtensa
processor. I am using a linux support package from Montavista which
does not have the libnspr. when the build tries to cross compile NSPR
it fails with the  error:  Unknown architecture.

>From some previous posts, I noticed that i needed to create a
prcpucfg.h which I did. But looking into _linux.h, I noticed that
there was some additional information for each processor.


Could you please help with information as to how I can
modify this source for a new architecture.


Thank you for any help.


Sincerely
Pradeep