Hi Scot,
You can add those label to a Kinetis linker file (.ld).
In the linker file you will see the RAM memory segments
m_data (rwx) : ORIGIN = 0x1FFF0000, LENGTH = 64K /* Lower SRAM */
m_data2 (rwx) : ORIGIN = 0x20000000, LENGTH = 64K /* Upper SRAM */
Then you can declare the labels:
_LOWER_RAMBAR = 0x1FFF0000;
_UPPER_RAMBAR = 0x20000000;
_LOWER_RAMSIZE = 64K;
_UPPER_RAMSIZE = 64K;
After this you can substract the size of the RAM from the size to get the amount of free RAM:
_FREE_LOWER_RAM_SIZE = _LOWER_RAMSIZE - SIZEOF(.data)
_FREE_UPPER_RAM_SIZE = _UPPER_RAMSIZE - SIZEOF(.user_data2);
Finally to get the address where the free RAM starts.
_LOWER_FREE_RAM_START = _LOWER_RAMBAR + _FREE_LOWER_RAM_SIZE;
_UPPER_FREE_RAM_START = _UPPER_RAMBAR + _FREE_UPPER_RAM_SIZE;
Hope this helps!
Carlos
