移植yaffs2时不能处理页请求

Unable to handle kernel paging request at virtual address 7461637b
pgd = c0004000
[7461637b] *pgd=00000000
Internal error: Oops: 3 [#1] ARM
Modules linked in:
CPU: 0    Not tainted  (3.4.0 #5)
PC is at yaffs_getxattr+0x20/0x90
LR is at get_vfs_caps_from_disk+0x5c/0xf8
pc : []    lr : []    psr: 60000013
sp : c3829e78  ip : c014b2d0  fp : 00000000
r10: c340bc00  r9 : c3805b80  r8 : c0497d80
r7 : c3829e94  r6 : 00000014  r5 : 74616373  r4 : c340dc30
r3 : 00000014  r2 : f0000010  r1 : c03f69fc  r0 : c340bc00
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: c000717f  Table: 30004000  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc3828270)
Stack: (0xc3829e78 to 0xc382a000)

在学毕业班时，遇到的问题，百度了一下也没找到答案，按照韦老师的视频用1.6的u-boot实验了，结果还是这样