diff options
Diffstat (limited to 'nuttx/configs/README.txt')
| -rw-r--r-- | nuttx/configs/README.txt | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/nuttx/configs/README.txt b/nuttx/configs/README.txt index b51b87bec..b3d0e91f5 100644 --- a/nuttx/configs/README.txt +++ b/nuttx/configs/README.txt @@ -270,8 +270,6 @@ defconfig -- This is a configuration file similar to the Linux CONFIG_DEBUG_GRAPHICS - enable NX graphics debug output (disabled by default) - CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot - time console output CONFIG_MM_REGIONS - If the architecture includes multiple regions of memory to allocate from, this specifies the number of memory regions that the memory manager must @@ -285,6 +283,28 @@ defconfig -- This is a configuration file similar to the Linux 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. + CONFIG_HEAP2_BASE and CONFIG_HEAP2_SIZE + Some architectures use these settings to specify the size of + a second heap region. + CONFIG_GRAN + Enable granual allocator support. Allocations will be aligned to the + granule size; allocations will be in units of the granule size. + Larger granules will give better performance and less overhead but + more losses of memory due to alignment and quantization waste. + NOTE: The current implementation also restricts the maximum + allocation size to 32 granaules. That restriction could be + eliminated with some additional coding effort. + CONFIG_GRAN_SINGLE + Select if there is only one instance of the granule allocator (i.e., + gran_initialize will be called only once. In this case, (1) there + are a few optimizations that can can be done and (2) the GRAN_HANDLE + is not needed. + CONFIG_DEBUG_GRAM + Just like CONFIG_DEBUG_MM, but only generates ouput from the gran + allocation logic. + + CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot + time console output CONFIG_MSEC_PER_TICK - The default system timer is 100Hz or MSEC_PER_TICK=10. This setting may be defined to inform NuttX that the processor hardware is providing |