How XMC registers can be accessed by ARM in 66AK2H12/06?

Hello,
I have a question about 66AK2H12/06 XMC.

Question)
 - Each DSP cores have XMC.
   When I access 0x00_0800_0000 by ARM core, which XMC is configured?

 - Can ARM core configure the particular XMC register?  (e.g. 66x_2 XMC)

Background)
  When it boots up from ARM core, I would like to configure XMC register by ARM, before it issues local reset to DSP core.

  The datasheet describes ARM core can access XMC configuration registers.

  When I checked 0x00_0800_0000 from ARM memory browser in CCS, I could not see any XMC values.

 Best regards, RY