求助几个warning怎么解决？关于GTX的时钟约束

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WARNING:ConstraintSystem - Constraint <NET "q0_clk1_refclk_i" TNM_NET =
   "q0_clk1_refclk_i";> [gtx_exdes.ucf(3)] was not distributed to the output pin
   QPLLOUTREFCLK of block gtx_init_i/gtx_i/gtxe2_common_0_i because the signal
   path to this output pin depends upon block attribute settings. Constraint
   distribution does not support attribute dependent distribution.
WARNING:ConstraintSystem - Constraint <NET "Q0_CLK1_GTREFCLK_PAD_N_IN" TNM_NET =
   "Q0_CLK1_GTREFCLK_PAD_N_IN";> [gtx_exdes.ucf(20)] was not distributed to the
   output pin QPLLOUTREFCLK of block gtx_init_i/gtx_i/gtxe2_common_0_i because
   the signal path to this output pin depends upon block attribute settings.
   Constraint distribution does not support attribute dependent distribution.
WARNING:ConstraintSystem - Constraint <NET "Q0_CLK1_GTREFCLK_PAD_P_IN" TNM_NET =
   "Q0_CLK1_GTREFCLK_PAD_P_IN";> [gtx_exdes.ucf(22)] was not distributed to the
   output pin QPLLOUTREFCLK of block gtx_init_i/gtx_i/gtxe2_common_0_i because
   the signal path to this output pin depends upon block attribute settings.
   Constraint distribution does not support attribute dependent distribution.
WARNING:ConstraintSystem - TNM : D_CLK was distributed to a DCM but new TNM
   constraints were not derived. This TNM is used in the following user groups
   or specifications:
   <TIMESPEC TS_J_TO_D = FROM "J_CLK" TO "D_CLK" TIG;>
   <TIMESPEC TS_D_TO_J = FROM "D_CLK" TO "J_CLK" TIG;>