:orphan:

.. title:: CONFIG_SRAM_OFFSET

.. kconfig:: CONFIG_SRAM_OFFSET

CONFIG_SRAM_OFFSET
##################

*Kernel SRAM offset*

Type: ``hex``

Help
====

.. code-block:: none

    A lot of x86 that resemble PCs have many reserved physical memory
    regions within the first megabyte. Specify an offset from the
    beginning of RAM to load the kernel in physical memory, avoiding these
    regions.

    Note that this does not include the "locore" which contains real mode
    bootstrap code within the first 64K of physical memory.

    This value normally need to be page-aligned.

Help
====

.. code-block:: none

    This option specifies the byte offset from the beginning of SRAM
    where the kernel begins. Changing this value from zero will affect
    the Zephyr image's link, and will decrease the total amount of
    SRAM available for use by application code.

    If unsure, leave at the default value 0.

Defaults
========

- 0x100000 if \ :kconfig:`X86_PC_COMPATIBLE <CONFIG_X86_PC_COMPATIBLE>`
- 0

Kconfig definitions
===================



At ``<Zephyr Architecture>/x86/Kconfig:177``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:39`` → ``<Zephyr Architecture>/Kconfig:12``

Menu path: (Top) → X86 Architecture Options

.. code-block:: kconfig

    config SRAM_OFFSET
    	hex
    	default 0x100000 if X86_PC_COMPATIBLE
    	depends on X86
    	help
    	  A lot of x86 that resemble PCs have many reserved physical memory
    	  regions within the first megabyte. Specify an offset from the
    	  beginning of RAM to load the kernel in physical memory, avoiding these
    	  regions.
	  
    	  Note that this does not include the "locore" which contains real mode
    	  bootstrap code within the first 64K of physical memory.
	  
    	  This value normally need to be page-aligned.

----

At ``Kconfig.zephyr:210``

Included via ``Kconfig:8``

Menu path: (Top) → Build and Link Features → Linker Options

.. code-block:: kconfig

    config SRAM_OFFSET
    	hex "Kernel SRAM offset" if HAS_SRAM_OFFSET
    	default 0
    	help
    	  This option specifies the byte offset from the beginning of SRAM
    	  where the kernel begins. Changing this value from zero will affect
    	  the Zephyr image's link, and will decrease the total amount of
    	  SRAM available for use by application code.
	  
    	  If unsure, leave at the default value 0.

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