Yes, I have EMMA2 PVR box with Nucleus instead of Linux,
As you kow the EMMA2 is one of CHIP for MPEG system,
and the MHP is MIDDLEWARE, it's dpend on the SYSTEM Operater.
yes, you can port MHP to EMMA platform, and you need support from NEC and one party company of MHP, it's not free.
To make DVB (MPEG) -S, -C or -T system, there are several different category.
Hardware platform, RTOS, Middleware, EPG, CAS, SMS and etc..
They are selected indivisually according to the situation and business.
When you want to PVR (HDD ebedded) then you have to select file system also.