(Yet another) RTEMS License Question

[Gene Smith]

I understand that any product sold or distributed containing an 
unmodified RTEMS release does not have to make available the source code 
of the application. This is clear from reading the license. However, 
what is not clear is if there is a requirement to inform the customer 
that RTEMS is present and make available on demand the unmodified RTEMS 
code used in the product?

Assuming that the answer to the above question is that the unmodified 
RTEMS code tree doesn't have to be provided, what if creation of the 
RTEMS application also requires a new or modified BSP, libcpu or other 
change to internal GPL licensed RTEMS files that are not yet or never 
become a part of an official RTEMS release or tree? Does this possibly 
trigger a requirement to make available to customers this modified RTEMS 
tree used in the product?

Thanks,

-gene