linux on DE2-70 with 2 blocks of sdram

[Altera_Forum]

hi, 

DE2-70 have 2 blocks of sdram .each of them is 32mb. i want to use both of them as RAM of my system .what can i do. As we know ,with one sdram chip,in sopc we named it DDR2_TOP.what can i do for 2.  I test it as follows :  1.allocate the address in sopc like this  sdram_1 0x0--0x1fffffff  sdram_2 0x20000000-3ffffff  2.modifiy the nios.h in linux  # define DDR2_TOP_BASE SDRAM_1_BASE  # defire DDR2_TOP_SPAN (SDRAM_1_SPAN+SDRAM_2_SPAN)  3.the kernel can generated fine when booting ,error occur: failure at cache_alloc_refile()  how can i fix it  thank you

[Altera_Forum]

you can use one 32bit 64m sdram ip core to controll the two sdram。 

 Any question,Contact me：pc21820002000@yahoo.com.cn  QQ:348630468