:orphan:

.. title:: KERNEL_VM_OFFSET

.. option:: CONFIG_KERNEL_VM_OFFSET

*Kernel offset within address space*

Type: ``hex``

Help
====

Offset that the kernel image begins within its address space,
if this is not the same offset from the beginning of RAM.

Some care may need to be taken in selecting this value. In certain
build-time cases, or when a physical address cannot be looked up
in page tables, the equation:

    virt = phys + ((KERNEL_VM_BASE + KERNEL_VM_OFFSET) -
                   SRAM_BASE_ADDRESS)

Will be used to convert between physical and virtual addresses for
memory that is mapped at boot.

This uncommon and is only necessary if the beginning of VM and
physical memory have dissimilar alignment.

Direct dependencies
===================

\ :option:`MMU <CONFIG_MMU>`

*(Includes any dependencies from ifs and menus.)*

Default
=======

- 0

Kconfig definition
==================

.. highlight:: kconfig

At ``arch/Kconfig:599``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:29``

Menu path: (Top) → Enable MMU features

.. parsed-literal::

    config KERNEL_VM_OFFSET
    	hex "Kernel offset within address space"
    	default 0
    	depends on \ :option:`MMU <CONFIG_MMU>`
    	help
    	  Offset that the kernel image begins within its address space,
    	  if this is not the same offset from the beginning of RAM.
	  
    	  Some care may need to be taken in selecting this value. In certain
    	  build-time cases, or when a physical address cannot be looked up
    	  in page tables, the equation:
	  
    	      virt = phys + ((KERNEL_VM_BASE + KERNEL_VM_OFFSET) -
    	                     SRAM_BASE_ADDRESS)
	  
    	  Will be used to convert between physical and virtual addresses for
    	  memory that is mapped at boot.
	  
    	  This uncommon and is only necessary if the beginning of VM and
    	  physical memory have dissimilar alignment.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*