Uboot 移植出错了

格式化NAND后   移植U-boot  串口打印如下信息（之前移植成功过，不知为什么 突然不行了）
##### EmbedSky BIOS for SKY2440/TQ2440 #####

Press Space key to Download Mode !

Booting Linux ...

Copy linux kernel from 0x00200000 to 0x30008000, size = 0x00300000 ...

Bad block at 0x4e0000 ,will be skipped

Copy Kernel to SDRAM done,Warning: this binary is not compressed linux kernel image

zImage magic = 0xffffffff

NOW, Booting Linux......

undefined instruction

pc : [<302e8038>]    lr : [<33d0182c>]

sp : 33cbdb60  ip : c000107e  fp : 33cbdddf

r10: 33cbdcdf  r9 : 00000000  r8 : 33cbffdc

r7 : 33cbdddf  r6 : 00000000  r5 : 000000a8  r4 : 30008000

r3 : 00008000  r2 : 30008000  r1 : c000107c  r0 : 00000000

Flags: nZcv  IRQs off  FIQs off  Mode SVC_32

Resetting CPU ...


nand_scan(): Cannot allocate oob_buf

请哪位大侠指点指点