Reserve a physical address space on Linux

Question

Is there a way to reserve a specific physical address space (say 0x2000 - 0x1000) in linux

I need to reserve it so that Linux does not use it in any way. It is used by some unrelated coprocessor, so it must be left unused.

thanks

Answer 1

To do this, you will have to write a kernel module. See Chapter 15, “Memory and DMA Mapping, ” from “ Linux Device Drivers Third Edition ”

[EDIT] You can use the Linux memmap kernel memmap for this:

 memmap=4K$0x2000 

Kudos go to Basile Starinkevich (see comment above)