Dear Hector,
Thank you much for your interest and help.
I have found a solution with JLink + openocd solution to use jtag as openocd provides a nice gdb server to debug any code on the LS1012A device. I also checked the JLink script documents and it seems probable to create a script to manipulate the interface behavior. But since the openocd solution is enough for my needs I do not know when I will dive inside JLink scripts.
Thank you again for your helps.
Gokhan