A few days ago, we tried to patch our kernel (2.6.10-rc3-mips) with gcov-kernel support.
Then. enable the option "Include GCOV coverage profiling" and "Provide GCOV proc file system entry" so that gcov-core.o and gcov-proc.o are built in the kernel image.
The compiler flag "-fprofile-arcs -ftest-coverage" is added in proper way, and the  .bb and .bbg related files are also generated after making kernel.
Then, after a system booting, we can see the message "gcov-core: core init gcov-proc: proc init (persist=0 link=1)" shown.
However, we only can see one vmlinux under /proc/gcov. Why we cannot get any .da files?
Is there something wrong ?
Could you give us some suggestion?