Hi3531 OS 内存增大问题

HI3531 ，两片DDR，分别512M，修改了bootargs和MMZ部分；
setenv bootargs 'mem=512M@0x80000000 mem=128M@0xC0000000 console=ttyAMA0,115200.....................


insmod mmz.ko mmz=anonymous,0,0xC8000000,383M anony=1 || report_error

系统启动后，看到linux内核只有512M，启动log信息中，

Uncompressing Linux... done, booting the kernel.
Linux version 3.0.8 (lucid@ubuntu) (gcc version 4.4.1 (Hisilicon_v100(gcc4.4-290+uclibc_0.9.32.1+eabi+linuxpthread)) ) #3 SMP Tue Nov 4 13:52:43 CST 2014
CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: godnet
Ignoring RAM at c0000000-c7ffffff (vmalloc region overlap).
Memory policy: ECC disabled, Data cache writealloc
PERCPU: Embedded 7 pages/cpu @c0ae0000 s5152 r8192 d15328 u32768
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 130048
Kernel command line: mem=512M@0x80000000 mem=128M@0xC0000000 console=ttyAMA0,115200 root=/dev/mtdblock2 rootfstype=jffs2 mtdparts=hi_sfc:1M(boot),4M(kernel),11M(rootfs);hinand:1M(boot),15M(kernel),200M(nand)
PID hash table entries: 2048 (order: 1, 8192 bytes)
...............


看到Ignoring RAM at c0000000-c7ffffff (vmalloc region overlap).
这个问题要怎么解决啊！！