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using eternal SDRAM for stack?

Hi.
I designed a board with LPC1788 and external sdram (K4s 32MB 16Bit)and all parts work correct.
so, I use RTX keil in my project and because of the some tasks which require big stack (I use emWIN), MCU SRAM is almost full. I defined some variables in ext. SDRAM.
my question is that can I use SDRAM for define stack memory? (Can I use SDRAM for stack memory)?
Thanks.

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