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DVRDK 4.0 ti81xxfb.ko can't be loaded.

Hello,TI man.

Now we use dvrrdk 4.0.but after power on,there are some errors:

[module] vpss probe done.
FB: no memory to allocate
ti81xxfb ti81xxfb: failed to allocate framebuffer
ti81xxfb ti81xxfb: failed to allocate fb memory.
ti81xxfb: probe of ti81xxfb failed with error -12

What's the reason?

load.sh:

insmod ./kermod/ti81xxfb.ko vram=0:8M,1:8M,2:8M

bootargs for Uboot:

setenv bootargs 'mem=512M console=ttyO2,115200n8 root=/dev/nfs rw nfsroot=129.1.9.101:/opt/dvrrdk/DVRRDK_04.00.00.03/target/rfs_816x,nolock ip=129.1.9.121:129.1.9.101:129.1.9.1:255.255.0.0::eth0:off vram=20M notifyk.vpssm3_sva=0xbfb00000 ddr_mem=2048M vmalloc=476M';saveenv

 thanks for any reply.