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problems about prebuild images

I am using the prebuild images to test my DM 37 board

1. I used the AM37 prebuild images. Everything is fine. WIFI is OK, BT is OK

2.I used the DM37 prebuild images.

By default the output is DVI but I want to show it on the 3.7 screen,

so I use the script "mkbootscr" in TOOL folder to create a new boot.scr

  setenv bootargs mem=71M@0x80000000 mem=128M@0x88000000 console=tty0
console=ttyS0,115200n8 androidboot.console=ttyS0 root=/dev/mmcblk0p2 rw
 rootfstype=ext3 init=/init rootwait ip=off
omap_vout.vid1_static_vrfb_alloc=y mpurate=1000

just delete this two from the original settings

omapdss.def_disp=dvi
omapfb.mode=dvi:1280x720MR-16

Then I can boot the board with SD card, but the WIFI and BT do not work.

What is the problem?

THX