[arm-gnu] Placing variable at absolute address in RAM

[JM]

Wow, lots of great suggestions, much more than I got at other forums, and quicker, too.  Thank you all and I will be using everything to come up with a solution.



> Hello
>
> I've researched this, asked on other forums, and so far I'm no closer.
>
> I'm trying to place a variable at a specific address in RAM on a TI ARM
> Cortex-M3. I have good reason for doing so, which I can explain briefly:
>
> The micro I'm using, LM3S9B92 has a DMA controller. There are 32 DMA
> channels and each channel requires a 16 byte struct in RAM for
> housekeeping. These 32 structs are placed into an array, which is 512
> bytes if you do the math, and must be placed on a 1024 byte boundary.
> Now....the datasheet indicates that the RAM for unused DMA channels can
> be used for something else. I'm using only one DMA channel, which is
> near the end of the list. If it were near the beginning, this would be
> easier to recover at least some of the wasted RAM by simply not making
> the array 32 members long.
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