diff --git a/litex/build/efinix/dbparser.py b/litex/build/efinix/dbparser.py
index 9f0e1d4f7..0b15d56cb 100644
--- a/litex/build/efinix/dbparser.py
+++ b/litex/build/efinix/dbparser.py
@@ -80,6 +80,21 @@ class EfinixDbParser():
 
         return None
 
+    def get_block_instance_names(self, block):
+        dmap = self.get_device_map(self.device)
+        die = self.get_die_file_name(dmap)
+        tree = et.parse(self.efinity_db_path + 'die/' + die)
+        root = tree.getroot()
+
+        peri = root.findall('efxpt:periphery_instance', namespaces)
+        names = []
+        for p in peri:
+            if p.get('block') == block:
+                names.append(p.get('name'))
+
+        print(f"block {block}: names:{names}")
+        return names
+
     def get_pll_inst_from_gpio_inst(self, dmap, inst):
         die = self.get_die_file_name(dmap)
         tree = et.parse(self.efinity_db_path + 'die/' + die)
diff --git a/litex/build/efinix/efinity.py b/litex/build/efinix/efinity.py
index f517a9c0e..f099877f8 100644
--- a/litex/build/efinix/efinity.py
+++ b/litex/build/efinix/efinity.py
@@ -156,7 +156,9 @@ def _build_peri(efinity_path, build_name, partnumber, named_sc, named_pc, fragme
 
     tools.write_to_file("iface.py", header + gen + gpio + add + footer)
 
-    subprocess.call([efinity_path + '/bin/python3', 'iface.py'])
+    if subprocess.call([efinity_path + '/bin/python3', 'iface.py']) != 0:
+        raise OSError("Error occurred during Efinity peri script execution.")
+
 
 # Project configuration ------------------------------------------------------------------------
 
@@ -316,7 +318,8 @@ class EfinityToolchain():
 
         # Run
         if run:
-            subprocess.call([self.efinity_path + '/scripts/efx_run.py', build_name + '.xml', '-f', 'compile'])
+            if subprocess.call([self.efinity_path + '/scripts/efx_run.py', build_name + '.xml', '-f', 'compile'])  != 0:
+                raise OSError("Error occurred during efx_run script execution.")
 
         os.chdir(cwd)
 
diff --git a/litex/build/efinix/platform.py b/litex/build/efinix/platform.py
index 2f337e881..e0ed622dd 100644
--- a/litex/build/efinix/platform.py
+++ b/litex/build/efinix/platform.py
@@ -22,9 +22,6 @@ class EfinixPlatform(GenericPlatform):
         self.timing_model = self.device[-2:]
         self.device       = self.device[:-2]
 
-        self.pll_available = ['PLL_TL0', 'PLL_TR0', 'PLL_TR1', 'PLL_TR2', 'PLL_TR3', 'PLL_BR0', 'PLL_BR1', 'PLL_BR2', 'PLL_BL0']
-        self.pll_used = []
-
         if os.getenv("LITEX_ENV_EFINITY", False) == False:
             msg = "Unable to find or source Efinity toolchain, please either:\n"
             msg += "- Set LITEX_ENV_EFINITY environment variant to Efinity path.\n"
@@ -40,6 +37,8 @@ class EfinixPlatform(GenericPlatform):
             raise ValueError("Unknown toolchain")
 
         self.parser = EfinixDbParser(self.efinity_path, self.device)
+        self.pll_available = self.parser.get_block_instance_names('pll')
+        self.pll_used = []
 
     def get_verilog(self, *args, special_overrides=dict(), **kwargs):
         so = dict(common.efinix_special_overrides)
diff --git a/litex/build/generic_platform.py b/litex/build/generic_platform.py
index 6d95d5ff3..96fe8bc8e 100644
--- a/litex/build/generic_platform.py
+++ b/litex/build/generic_platform.py
@@ -155,7 +155,10 @@ class ConnectorManager:
         r = []
         for identifier in identifiers:
             if ":" in identifier:
-                conn, pn = identifier.split(":")
+                try:
+                    conn, pn = identifier.split(":")
+                except ValueError as err:
+                    raise ValueError(f"\"{identifier}\" {err}") from err
                 if pn.isdigit():
                     pn = int(pn)
 
diff --git a/litex/soc/integration/soc.py b/litex/soc/integration/soc.py
index a63c5d6c9..dc2e7fb7b 100644
--- a/litex/soc/integration/soc.py
+++ b/litex/soc/integration/soc.py
@@ -731,7 +731,7 @@ class SoC(Module):
         self.logger.info(colorer("Creating SoC... ({})".format(build_time())))
         self.logger.info(colorer("-"*80, color="bright"))
         self.logger.info("FPGA device : {}.".format(platform.device))
-        self.logger.info("System clock: {:3.2f}MHz.".format(sys_clk_freq/1e6))
+        self.logger.info("System clock: {:3.3f}MHz.".format(sys_clk_freq/1e6))
 
         # SoC attributes ---------------------------------------------------------------------------
         self.platform     = platform
diff --git a/litex/soc/interconnect/csr.py b/litex/soc/interconnect/csr.py
index ba4409bea..ab1730a0e 100644
--- a/litex/soc/interconnect/csr.py
+++ b/litex/soc/interconnect/csr.py
@@ -419,11 +419,18 @@ class CSRStorage(_CompoundCSR):
         self.sync += self.re.eq(sc.re)
 
     def read(self):
-        """Read method for simulation."""
+        """Read method for simulation.
+
+        Side effects: none (asynchronous)."""
         return (yield self.storage)
 
     def write(self, value):
-        """Write method for simulation."""
+        """Write method for simulation.
+
+        Side effects: synchronous advances simulation clk by one tick."""
+        if bits_for(value) > self.size:
+            raise ValueError(f"value {value} exceeds range of {self.size} bit CSR {self.name}.")
+
         yield self.storage.eq(value)
         yield self.re.eq(1)
         if hasattr(self, "fields"):