Help¶

If user mode is enabled, and MPU hardware has requirements that regions be sized to a power of two and aligned to their size, and user mode threads need to access this heap, then this is necessary to properly define an MPU region for the heap.

If this is left at 0, then remaining system RAM will be used for this area and it may not be possible to program it as an MPU region.

Direct dependencies¶

MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT && USERSPACE && NEWLIB_LIBC

(Includes any dependencies from ifs and menus.)

Default¶

0

Kconfig definition¶

At <Zephyr>/lib/libc/Kconfig:55

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:33 → <Zephyr>/lib/Kconfig:4

Menu path: (Top) → C Library

config NEWLIB_LIBC_ALIGNED_HEAP_SIZE
    int "Newlib aligned heap size"
    default 0
    depends on MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT && USERSPACE && NEWLIB_LIBC
    help
      If user mode is enabled, and MPU hardware has requirements that
      regions be sized to a power of two and aligned to their size,
      and user mode threads need to access this heap, then this is necessary
      to properly define an MPU region for the heap.

      If this is left at 0, then remaining system RAM will be used for this
      area and it may not be possible to program it as an MPU region.

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