Forum Post: Write Virtual Address to PLE c11, c5 error

Dear supporters:

For performance concern, I 'd like to copy data from RAM to A8 Cortex L2 cache way via Preload Engine(PLE).

I am currently stuck on writing the virtual address to the PLE (3.2.64 c11). 

I suppose that the general purpose registers, r0, r1...,rN can be used to pass arguments to

assembly function, so I wrote a simple *.asm file to write start address

to PLE c5 register as below:

.global Write_PLEStartAddress

Write_PLEStartAddress:

mcr p15,#0,r0,c11,c5,#0

The buffer address of lut_data, the passing argument after calling

Write_PLEStartAddress(lut_data );

is 0x80240158  (r0 shows correctly on CCS register view)

However, after I wrote the PLE start address and read back from registers by issuing the cmd,

mrc p15,#0,r0,c11,c5,#0

bx lr

I got 0x80240178 or 0x8024016C, but never 0x80240158.

Could someone has any idea about why is this happening?

My platform info: TMS320DM8148 (Vision-Mid) 

600-MHz ARM® Cortex™-A8 RISC MPU

500-MHz C674x™ VLIW DSP

200-MHz M3-ISS/M3-HDVPSS 

Best regards,

Joey from Altek