AM62P: Defragment memory

Hi,

By default, the complete 8GB DDR in AM62P EVM is available for the QNX kernel to use - defined in these 2 mem regions:

//AM62P includes two DDR data regions: 2GB at 0x8000_0000 and 6GB at 0x8_8000_0000
#define IDK_DDR0_BASE 0x80000000ul
#define IDK_DDR0_SIZE (MEG(2048)) /* 2GB */

#define IDK_DDR1_BASE 0x880000000ul
#define IDK_DDR1_SIZE (MEG(6144)) /* 6GB */

BSP code: bsp/src/hardware/startup/boards/am62p/evm/board.h

However, following carveouts are added in this memory available to QNX kernel: 

1.  Carveout of 0x0007FFFF (512KB) at 0x80000000 to protect load address of arm trusted firmware

2.  Carveout memory for remote cores , Start address is at 0x99A00000 and a total size is 0x26600000

3.  For Codec: HighMem region is default and carveout at 0x880000000, total size - 0x30000000
     Lowmem region can used for codec starting at : 0xC0000000, total size: 0x30000000

1,2 carveouts above are fixed. But codec region can be changed as per usecase. If you want to use the codec in high_mem region of DDR i.e.  0x880000000, you can remove the memory reserved for codec from the low memory region - -r0xC0000000,0x30000000,1

This chnage can be done in the QNX build file: bsp/images/am62p-evm-ti.build

[+keeplinked] startup-am62p-evm -v -r0x80000000,0x0007FFFF,1 -r0x99A00000,0x26600000,1 -r0xC0000000,0x30000000,1 ,-r0x880000000,0x30000000,1

These details about the carveouts and memory regions is available in PSDK docs, and as comments in the above QNX build file.

Regards,

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