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Adding bounce buffer for DMA below 512M

Question asked by fwmiller on Jun 12, 2014
Latest reply on Jun 16, 2014 by fwmiller



I'm trying to add DMA to the SPI driver we are using on the 21489 EZKit board.  The IISPI register is limited to 19 bits which is the lower 512M.  Problem is our memory map is all above this address so I think I need to modifiy the memory map.  My question is, whats the easiest way to carve out a 1K block of memory for a bounce buffer that is below 0x80000 in the linker file?  Are there any other places where I would need to update besides the .ldf file?