Add grabber module

Signed-off-by: Egor Savkin <es@m-labs.hk>

src/gateware/kasli_soc.py

@@ -139,7 +139,7 @@ class GenericStandalone(SoCCore):
             Instance("BUFG", i_I=clk_synth_se, o_O=clk_synth_se_buf),
         ]
         fix_serdes_timing_path(platform)
-        self.submodules.bootstrap = GTPBootstrapClock(self.platform, description["rtio_frequency"])
+        self.submodules.bootstrap = GTPBootstrapClock(self.platform, clk_freq)
         self.config["CLOCK_FREQUENCY"] = int(clk_freq)
 
         self.submodules.sys_crg = zynq_clocking.SYSCRG(self.platform, self.ps7, clk_synth_se_buf)