diff --git a/driver/CompileGo.cpp b/driver/CompileGo.cpp
index 585957c..88e1612 100644
--- a/driver/CompileGo.cpp
+++ b/driver/CompileGo.cpp
@@ -469,8 +469,25 @@ bool CompileGoImpl::setup(const Action &jobAction)
   Options.AllowFPOpFusion = *dofuse;
 
   // Support -march
-  std::string cpuStr;
   opt::Arg *cpuarg = args_.getLastArg(gollvm::options::OPT_march_EQ);
+  if (!setupArch(cpuarg, targetCpuAttr_, targetFeaturesAttr_, triple_, progname_))
+    return false;
+
+  // Create target machine
+  Optional<llvm::CodeModel::Model> CM = None;
+  target_.reset(
+      TheTarget->createTargetMachine(triple_.getTriple(),
+                                     targetCpuAttr_, targetFeaturesAttr_,
+                                     Options, driver_.reconcileRelocModel(),
+                                     CM, cgolvl_));
+  assert(target_.get() && "Could not allocate target machine!");
+
+  return true;
+}
+
+bool setupArch(opt::Arg *cpuarg, std::string &cpu, std::string &attrs,
+               Triple triple_, const char *progname_) {
+  std::string cpuStr;
   if (cpuarg != nullptr) {
     std::string val(cpuarg->getValue());
     if (val == "native")
@@ -510,18 +527,8 @@ bool CompileGoImpl::setup(const Action &jobAction)
       return false;
     }
   }
-  targetCpuAttr_ = cpuAttrs->cpu;
-  targetFeaturesAttr_ = cpuAttrs->attrs;
-
-  // Create target machine
-  Optional<llvm::CodeModel::Model> CM = None;
-  target_.reset(
-      TheTarget->createTargetMachine(triple_.getTriple(),
-                                     targetCpuAttr_, targetFeaturesAttr_,
-                                     Options, driver_.reconcileRelocModel(),
-                                     CM, cgolvl_));
-  assert(target_.get() && "Could not allocate target machine!");
-
+  cpu = cpuAttrs->cpu;
+  attrs = cpuAttrs->attrs;
   return true;
 }
 
diff --git a/driver/CompileGo.h b/driver/CompileGo.h
index c33b8df..62551b1 100644
--- a/driver/CompileGo.h
+++ b/driver/CompileGo.h
@@ -43,6 +43,9 @@ class CompileGo : public InternalTool {
   std::unique_ptr<CompileGoImpl> impl_;
 };
 
+bool setupArch(llvm::opt::Arg *cpuarg, std::string &cpu, std::string &attrs,
+               llvm::Triple triple_, const char *progname_);
+
 } // end namespace driver
 } // end namespace gollvm
 
diff --git a/driver/Driver.cpp b/driver/Driver.cpp
index 856ba15..c8a7db5 100644
--- a/driver/Driver.cpp
+++ b/driver/Driver.cpp
@@ -186,7 +186,8 @@ bool Driver::supportedAsmOptions()
       continue;
     }
     if (value.startswith("-compress-debug-sections") ||
-        value.startswith("--compress-debug-sections")) {
+        value.startswith("--compress-debug-sections") ||
+        value.startswith("-march")) {
       continue;
     }
     // Unrecognized -Wa,... option
diff --git a/driver/IntegAssembler.cpp b/driver/IntegAssembler.cpp
index 39d080f..ee6bf65 100644
--- a/driver/IntegAssembler.cpp
+++ b/driver/IntegAssembler.cpp
@@ -20,6 +20,7 @@
 #include "GollvmOptions.h"
 #include "GollvmConfig.h"
 #include "GollvmPasses.h"
+#include "CompileGo.h"
 
 #include "Action.h"
 #include "Artifact.h"
@@ -178,6 +179,8 @@ bool IntegAssemblerImpl::invokeAssembler()
   assert(MRI && "Unable to create target register info!");
 
   MCTargetOptions MCOptions;
+  if (triple_.getArch() == llvm::Triple::riscv64)
+    MCOptions.ABIName = "lp64d";
   std::unique_ptr<MCAsmInfo> MAI(
       TheTarget->createMCAsmInfo(*MRI, Trip, MCOptions));
   assert(MAI && "Unable to create target asm info!");
@@ -185,16 +188,6 @@ bool IntegAssemblerImpl::invokeAssembler()
   // Note: -Xassembler and -Wa, options should already have been
   // examined at this point.
 
-  // FIXME: no support yet for -march (bring over from CompileGo.cpp)
-  opt::Arg *cpuarg = args_.getLastArg(gollvm::options::OPT_march_EQ);
-  if (cpuarg != nullptr) {
-    errs() << progname_ << ": internal error: option '"
-           <<  cpuarg->getAsString(args_)
-           << "' not yet implemented in integrated assembler\n";
-    assert(false);
-    return false;
-  }
-
   // Support for compressed debug.
   llvm::DebugCompressionType CompressDebugSections =
       llvm::DebugCompressionType::None;
@@ -208,6 +201,8 @@ bool IntegAssemblerImpl::invokeAssembler()
   // Build up the feature string from the target feature list.
   std::string FS;
   std::string CPU;
+  opt::Arg *cpuarg = args_.getLastArg(gollvm::options::OPT_march_EQ);
+  setupArch(cpuarg, CPU, FS, triple_, progname_);
   std::unique_ptr<MCStreamer> Str;
   std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
   std::unique_ptr<MCSubtargetInfo> STI(