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About AM437x MMCSD card Driver transplanted into the SYS/BIOS failed

Hi every one

    Now I try to transplant MMCSD card driver to SYS/BIOS, use startware example.MMCCARD configured to MMC2, no SYS/BIOS run normally, but under the SYS/BIOS, cannot access MMCSD2 registers. If configured to MMC1 or MMC0, unified operating normally.

The error is
 "Can't find a source file at "  ree brary/trees/xdctargets/xdctargets-h38x/src/gnu/targets/arm/rtsv7A/syscalls.c" 
Locate the file or edit the source lookup path to include its location."

thanks

Aria li