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Update README

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This commit is contained in:
Gregory Nutt 2016-01-17 08:11:59 -06:00
parent 6cf87e5fd5
commit 736e5224b8
1 changed files with 12 additions and 11 deletions
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configs/arduino-mega2560/README.txt
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@ -86,19 +86,20 @@ Configurations
1. As of 2015-01-16, the default static memory usage is:
$ size nuttx.elf
text data bss dec hex filename
34348 2117 944 37409 9221 nuttx.elf
$ size nuttx.elf
text data bss dec hex filename
34348 2117 944 37409 9221 nuttx.elf
And dynamic, heap usage:
nsh> free
total used free largest
Mem: 4736 1768 2968 2968
nsh> free
total used free largest
Mem: 4736 1768 2968 2968
There is plenty of FLASH space, so many additional NSH featurs
could be enabled. There is, however, not a lot of free SRAM.
There is plenty of FLASH space but not a lot of free SRAM. This
SRAM usage is due primarily to constant strings defined by NSH.
NOTE: There is partial support for the MEMX pointer in apps/nshlib.
If that support were completed then some reduction of the static
.data allocation could be achieved by enabling the MEMX pointer.
NOTE: I investigated the possibility of adding IPTR/IOBJ
qualifiers in the NSH library and moving the strings to FLASH.
This is still a possibility but would requires some extensive
changes to NSH.