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i have something wrong with am335x_sk

i have follow this page:

http://processors.wiki.ti.com/index.php/TI-Android-JB-4.1.2-DevKit-4.0.1_DeveloperGuide

to build all the files and make a sdcard for am335x_sk. 

when i boot the am335x_sk ,i have this log without display,who can tell me why?

[ 5.468902] adb_open
root@android:/ # [ 5.505706] pvrsrvkm: disagrees about version of symbol module_layout
[ 5.524444] omaplfb: disagrees about version of symbol module_layout
[ 7.211700] init: untracked pid 71 exited
[ 10.852142] init: untracked pid 190 exited
[ 16.931945] init: untracked pid 231 exited
[ 21.382904] init: untracked pid 237 exited
[ 25.802307] init: untracked pid 243 exited
[ 31.926910] init: untracked pid 249 exited

[ 5.524444] omaplfb: disagrees about version of symbol module_layout
[ 7.211700] init: untracked pid 71 exited
[ 10.852142] init: untracked pid 190 exited
[ 16.931945] init: untracked pid 231 exited
[ 21.382904] init: untracked pid 237 exited
[ 25.802307] init: untracked pid 243 exited
[ 31.926910] init: untracked pid 249 exited

after this ,i use the prebuild image 

http://software-dl.ti.com/dsps/dsps_public_sw/sdo_tii/TI_Android_DevKit/TI_Android_JB_4_1_2_DevKit_4_0_1/exports/am335xevm_sk.tar.gz

I can boot am335x_sk ,compare the prebuilt whit my build,I found kernel have some difference。

who tell me why?