to Peter Zubaj<br><br>    Thanks.<br>    I have done as you said. But when I insmod my sound module, there are some errors as :<br>.......<br>Unable to handle kernel NULL pointer dereference at virtual address 00000194<br>pgd = c39d4000<br>[00000194] *pgd=a3979011, *pte=00000000, *ppte=00000000<br>Internal error: Oops: 7 [#1]<br>Modules linked in: snd_ucb1400 snd_ac97_codec snd_pcm snd_page_alloc snd_timer eCPU: 0<br>PC is at snd_ac97_valid_reg+0x28/0x1d4 [snd_ac97_codec]<br>LR is at 0x1<br>pc : [&lt;bf038028&gt;]    lr : [&lt;00000001&gt;]    Not tainted<br>sp : c38f3d94  ip : 00000000  fp : c38f3dac<br>r10: c000b2c4  r9 : 00000001  r8 : c3923c10<br>r7 : bf0427d8  r6 : 00000198  r5 : 00000000  r4 : 00000000<br>r3 : c0296474  r2 : c0296474  r1 : c02f06d0  r0 : 00000025<br>Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  Segment user<br>Control: 397F  Table: A39D4000  DAC: 00000015<br>.......<br><br>   I don't know what these infomation mean. Can anyone tell me ? Thanks a lot!<br><br>sudong<br>2004-12-3<br>