It isn't possible to address to External MRAM Memory on CS1.
I use M523XEVB set
I program in the environment of IAR V1.23 KickStart.
For initialization of CS1 I use a code
MCF_CS1_CSAR = 0x3000;
MCF_CS1_CSCR = 0x3d20;
MCF_CS1_CSMR = MCF_CS_CSMR_BAM_1M | MCF_CS_CSMR_V;
In the lnkm5235EVB_flash.xcl file (the configuration IAR file) I import a line:
As Flash Programmer I use CodeWarrior v6.3 for a configuration of a board I use the standard MCF523xEVB_PnE.cfg file
In the program I address to this area of memory and I have no activity on CS1.