Oh,never mind. sashz tell me to try the latest builder, he said that the latest builder has fixed some bugs. I am now compiling the crosstools for the this new one. And it seems that the old crosstool, which is built for the older builder, could not work well on a newly built builder. Hope this new builder can give me a "initrd.bin".
Oh , god I nearly get the initrd.bin yesterday. I am not sure if it is because of the vendor-tweaks...ipk.