CCS/OMAP-L138: Pls help:The host download code to omapl138' arm core by HPI bootloader,But the HPI interface does not work after ARM core restart.

Part Number:OMAP-L138

Tool/software: Code Composer Studio

Pls help:The host download code to omapl138' arm core by HPI bootloader,But the HPI interface does not work after ARM core restart.

Detailed failure is :When read data through HPI interface,The HPIAR register increase by one but not four,and HPID is all zero.

Thanks.