ZYNQ 从nand启动Linux系统、烧写总是失败？

我用矿机板子4205想从NAND启动Linux系统、可是在下载的时候出了问题、、

要么提示

要么就提示：

CortexA9 Processor Configuration& l: w6 ~' Q6 _
-------------------------------------" Q+ w0 \7 H& m7 p: K
Version.............................0x00000003
5 i% x2 o8 M3 [2 m/ g  H" bUser ID.............................0x00000000$ {+ ^3 R+ F3 m& q/ W7 x
No of PC Breakpoints................6
0 H) q* Z! Z4 Y; g  Z! ]No of Addr/Data Watchpoints.........4* C7 D9 k8 `! y: s; a
Processor Reset .... DONE* O. I1 L  h: l' g7 J' {
Processor Reset .... DONE
# f7 k4 V7 S2 |* a0 ]5 Y9 x( [Prompt timeout.4 t: \6 {8 S" k! k( O5 a
Problem in running uboot
, _+ s; n8 q) `6 Y7 hIntialization of XMD failed.

ERROR: Flash Operation Failed

有没有大佬知道原因？