iMX8MQ 8GB memory

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iMX8MQ 8GB memory

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mehrenfried
Contributor I

Hi Yuri,

you have mentioned the A53 address space is limited to 4GB

How should I interpret the two different memory maps for Cortex A53 and M4

A53:

1_0000_0000 1_3FFF_FFFF DDR Address 1024MB DDR Memory (Quad-A53 only

    4000_0000     FFFF_FFFF DDR Address 3072MB DDR Memory (All modules)

 M4:

    4000_0000     BFFF_FFFF DDR Address 2048MB DDR Memory

Does this mean A53 and M4 Cores utilize 6GB DDR Memory space in total?

The total addressable space is still 8GB (2^33bit according Reference Manual 3.2.5.7) or is it mandatory, that the M4 memory space is within the 4GB boundary?

Regards,

Matthias

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

    Address area 4000_0000 - FFFF_FFFF  is 3GB  Memory  accessible for all modules,

say also for GPU.

  Address area 1_0000_0000 - 1_3FFF_FFFF is 1GB  Memory  is accessible for 64-bit

Quad-A53 only. (GPU cannot access it.)

   Address area 4000_0000   -  BFFF_FFFF DDR  is 2GB  part of the mentioned 3GB 

Memory, accessible for CM4.

Regards,

Yuri.

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