Help¶

Size of the kernel’s address space. Constraining this helps control how much total memory can be used for page tables.

The area defined by SRAM_BASE_ADDRESS to SRAM_BASE_ADDRESS + KERNEL_VM_SIZE must have enough room to map system RAM, plus any driver mappings. Further mappings may be made at runtime depending on configuration options (such as memory-mapping stacks, VDSO pages, etc).

Direct dependencies¶

MMU

(Includes any dependencies from ifs and menus.)

Default¶

0xC0000000

Kconfig definition¶

At <Zephyr>/arch/Kconfig:542

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:29

Menu path: (Top) → Enable MMU features

config KERNEL_VM_SIZE
    hex "Size of kernel address space in bytes"
    default 0xC0000000
    depends on MMU
    help
      Size of the kernel's address space. Constraining this helps control
      how much total memory can be used for page tables.

      The area defined by SRAM_BASE_ADDRESS to SRAM_BASE_ADDRESS +
      KERNEL_VM_SIZE must have enough room to map system RAM, plus any driver
      mappings. Further mappings may be made at runtime depending on
      configuration options (such as memory-mapping stacks, VDSO pages, etc).

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)