px4-firmware/nuttx/mm/Kconfig

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#
# For a description of the syntax of this configuration file,
# see misc/tools/kconfig-language.txt.
#
config MM_REGIONS
int "Number of memory regions"
default 1
---help---
If the architecture includes multiple, non-contiguous regions of
memory to allocate from, this specifies the number of memory regions
that the memory manager must handle and enables the API
mm_addregion(start, end);
config MM_SMALL
bool "Small memory model"
default n
---help---
Each memory allocation has a small allocation overhead. The size
of that overhead is normally determined by the "width" of the
address support by the MCU. MCUs that support 16-bit addressability
have smaller overhead than devices that support 32-bit addressability.
However, there are many MCUs that support 32-bit addressability *but*
have internal SRAM of size less than or equal to 64Kb. In this case,
CONFIG_MM_SMALL can be defined so that those MCUs will also benefit
from the smaller, 16-bit-based allocation overhead.