armcortex-mbare-metalnxp-microcontroller

Where is ARM's (LPC18xx's) shadow pointer

I am working with an NXP LPX1837. User manual UM10430, sec 4.3 talks about

The LPC 18xx contains a shadow pointer that allows areas of memory to be mapped to address 0x0.

and

set ARM's shadow pointer

I want to utilize this shadow pointer. But I can't find further informations for that. Can anyone give me a hint, where i can find more details / spec about this shadow pointer? Is it really an ARM feature or specific to LPC18xx?

Thx Manuel

Solution

  • To answer my own questiong:

    Shadow pointer is in

    CREG->M3MEMMAP

    Shadow address when accessing memory at address 0x00000000 + X. All memory mapped addresses must be located on a 4 kB boundary.