We have 2 x 32MB SDRAMs on our product. We have now upgraded the SDRAM to 64MB each(same manufacturer (ISSI)). As far as the hardware is concerned the extra address line/s have been connected.
Now I need to enable and use this extra SDRAM. So far I have:-
1. modified the chip select register SDCS0 in bsp_init.c to 0x40000019 and rebuilt the bsp library.
2. modified the __EXTERNAL_SDRAM_SIZE .lcf linker file being used in our project
To test this extra SDRAM I try and allocate some some by using _mem_alloc_from(). I get NULL.
Also tried writing directly in the code with the following line "*(long *)0x43000000 = 0x5A;"
Do I need to change/configure anything else?
Using Codewarrior v6.3, MCF5329 and MQX version 2.5