USB_FW_CTRL
ocp_word_set_bits(tp, MCU_TYPE_USB, USB_FW_CTRL, FLOW_CTRL_PATCH_OPT);
ocp_word_set_bits(tp, MCU_TYPE_USB, USB_FW_CTRL, FLOW_CTRL_PATCH_2);
ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_FW_CTRL);
ocp_write_word(tp, MCU_TYPE_USB, USB_FW_CTRL, ocp_data);