Unexplained Magic Words in Addressing in FIRA (FIR Accelerator sample program)

Question

Hi, I found a puzzling magic word in the FIRA sample program. 
 The addressing is logically summed to 0xA000000. 
 It like this: 
 FIRA_TCB1[0]= ((int)(FIRA_TCB2+12)>>2) | 0xA000000; // CP Chain Pointer Register 
 I could not find the meaning of this word in the datasheet or HRM. 
 What on earth could this be? The sample code can be found at ADSP-SC58x/2158x FIR Accelerator: Example code 
 Thank you for your generosity.

hiro.sp · Answer

I noticed that the it for L1 Memory in Multiprocessor Space ( 0x28000000 >> 2 ). This is because FIRA is outside the core and accesses L1 memory in the core via an outside bus. Thus, for example, when the buffer is placed in an external memory such as SDRAM, this magic word is not necessary. 
 However, looking at the source, this is a bad example of using magic words without explanation. It confuses beginners. 
 --- After noticing this, I tried moving the buffer to SDRAM, but the first channel is not fully operational. There still seems to be some problem. But I will close this question for now. Thank you.