From 2f3e2e0eaaba551846d8c3581ca3267d1160a1e8 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Wed, 17 Sep 2008 18:37:46 +0000 Subject: 2008-09-17 Joel Sherrill * user/conf.t: Add support for optionally having a unified work area. In other words, the RTEMS Workspace and C Program Heap are the same pool of memory. --- doc/ChangeLog | 6 ++++++ doc/user/conf.t | 14 ++++++++++++++ 2 files changed, 20 insertions(+) (limited to 'doc') diff --git a/doc/ChangeLog b/doc/ChangeLog index c84f5e5f18..c5c9930237 100644 --- a/doc/ChangeLog +++ b/doc/ChangeLog @@ -1,3 +1,9 @@ +2008-09-17 Joel Sherrill + + * user/conf.t: Add support for optionally having a unified work area. + In other words, the RTEMS Workspace and C Program Heap are the same + pool of memory. + 2008-09-09 Joel Sherrill * bsp_howto/Developer-User-Timeline.png: Correct figure. diff --git a/doc/user/conf.t b/doc/user/conf.t index 23d8f2186c..ad5cc20e60 100644 --- a/doc/user/conf.t +++ b/doc/user/conf.t @@ -210,6 +210,20 @@ address of the RTEMS RAM Workspace. By default, this value is NULL indicating that the BSP is to determine the location of the RTEMS RAM Workspace. +@findex CONFIGURE_UNIFIED_WORK_AREAS +@item @code{CONFIGURE_UNIFIED_WORK_AREAS} configures RTEMS to use a +single memory pool for the RTEMS Workspace and C Program Heap. If not +defined, there will be separate memory pools for the RTEMS Workspace and +C Program Heap. Having separate pools does haved some advantages in the +event a task blows a stack or writes outside its memory area. However, +in low memory systems the overhead of the two pools plus the potential +for unused memory in either pool is very undesirable. + +In high memory environments, this is desirable when you want to use the +RTEMS "unlimited" objects option. You will be able to create objects +until you run out of all available memory rather then just until you +run out of RTEMS Workspace. + @item @code{CONFIGURE_MICROSECONDS_PER_TICK} is the length of time between clock ticks. By default, this is set to 10000 microseconds. -- cgit v1.2.3