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66AK2H12: 66K2H12 power domain transition never complete

Part Number: 66AK2H12

Hello:

We have  a 66ak2h12 demo board  from ti 

Recently, we found u-boot can't work well,   when boot up, u-boot error that    "No ethernet found." 

I also use xtcievmk2x.gel and xds200 to connect the board .but it also error: Timeout  pd=2, md=7!  Timeout  pd=2, md=7!

 in .gel file 

// Modules on power domain 2
#define LPSC_PA (7)
#define LPSC_SGMII (8)

Tt seems that power domain 2, Modules 7  and 8 don't work well.

In u-boot cmdline,

md.l 0x02350128 1

resul is:

0x00000040

It means that transition never clear and never completes. so the gel file error: time out

Because this board works well last week, and till this week , we doesn't do anything.

We don't know what to try next. Why power domain 2 's transition never clear when power on?

Please help!