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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-05-28 21:42:18 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-05-28 21:42:18 +0000 |
commit | 94c7babe23d72a1e379da0cf0aab32fcf9fadcf3 (patch) | |
tree | eedc930a4ed4a1108c87cae26d3fcda7e411dd1f /nuttx/configs | |
parent | 405c2b328ff4cd571bb9e464541b4d297b18f93d (diff) | |
download | px4-nuttx-94c7babe23d72a1e379da0cf0aab32fcf9fadcf3.tar.gz px4-nuttx-94c7babe23d72a1e379da0cf0aab32fcf9fadcf3.tar.bz2 px4-nuttx-94c7babe23d72a1e379da0cf0aab32fcf9fadcf3.zip |
atexit() functions now called when task killed by task delete; For MCUs with <= 64Kb of SRAM, CONFIG_MM_SMALL can be defined to reduce the memory allocation overhead
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3648 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/configs')
-rw-r--r-- | nuttx/configs/README.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/nuttx/configs/README.txt b/nuttx/configs/README.txt index d00fe1e20..509e57281 100644 --- a/nuttx/configs/README.txt +++ b/nuttx/configs/README.txt @@ -261,6 +261,15 @@ defconfig -- This is a configuration file similar to the Linux 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 - 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. 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 |