Our board has NOR flash on EIM CS0. I can JTAG program the SDK into the NOR flash using openocd. However, once the SDK is programmed in and boots, it reconfigures some of the registers so that JTAG can no longer modify/erase/read the NOR flash. I have checked all of the EIM_CS0* registers and they are fine. I do not understand which other registers I need to modify in order to access the NOR flash vi JTAG again.
Can someone briefly explain what registers may be causing this?