[U-Boot] XUPV2P : U-boot doesn't detect the systemace, compact flash

Hi, community

I'm using a XUPV2P board and the I runs the u-boot from a compact flash. But when I try to read the compact flash the command didn't succeed.

U-Boot-mONStR> fatinfo ace 0 **** ACE CompactFlash not found. ** Can't read from device 0 **

** Unable to use ace 0:1 for fatinfo **

U-Boot-mONStR> fatls ace 0 **** ACE CompactFlash not found. **** ACE CompactFlash not found. ** Can't read from device 0 **

What's going on?

Thank you for help me!