diff --git a/pkgs/development/tools/misc/blackmagic/default.nix b/pkgs/development/tools/misc/blackmagic/default.nix
index 281463528354..ddc15f856b53 100644
--- a/pkgs/development/tools/misc/blackmagic/default.nix
+++ b/pkgs/development/tools/misc/blackmagic/default.nix
@@ -1,28 +1,30 @@
 { stdenv, lib, fetchFromGitHub
-, gcc-arm-embedded, binutils-arm-embedded, libftdi
+, gcc-arm-embedded, libftdi1
 , python, pythonPackages
 }:
 
 with lib;
 
 stdenv.mkDerivation rec {
-  name = "blackmagic-${version}";
-  version = "1.6.1";
+  pname = "blackmagic";
+  version = "unstable-2019-08-13";
+  # `git describe --always`
+  firmwareVersion = "v1.6.1-317-gc9c8b08";
 
   src = fetchFromGitHub {
     owner = "blacksphere";
     repo = "blackmagic";
-    rev = "29386aee140e5e99a958727358f60980418b4c88";
-    sha256 = "05x19y80mixk6blpnfpfngy5d41jpjvdqgjzkmhv1qc03bhyhc82";
+    rev = "c9c8b089f716c31433432f5ee54c5c206e4945cf";
+    sha256 = "0175plba7h3r1p584ygkjlvg2clvxa2m0xfdcb2v8jza2vzc8ywd";
     fetchSubmodules = true;
   };
 
   nativeBuildInputs = [
-    gcc-arm-embedded binutils-arm-embedded
+    gcc-arm-embedded
   ];
 
   buildInputs = [
-    libftdi
+    libftdi1
     python
     pythonPackages.intelhex
   ];
@@ -30,7 +32,7 @@ stdenv.mkDerivation rec {
   postPatch = ''
     # Prevent calling out to `git' to generate a version number:
     substituteInPlace src/Makefile \
-      --replace '`git describe --always --dirty`' '${version}'
+      --replace '$(shell git describe --always --dirty)' '${firmwareVersion}'
 
     # Fix scripts that generate headers:
     for f in $(find scripts libopencm3/scripts -type f); do
@@ -41,6 +43,8 @@ stdenv.mkDerivation rec {
   buildPhase = "${stdenv.shell} ${./helper.sh}";
   installPhase = ":"; # buildPhase does this.
 
+  enableParallelBuilding = true;
+
   meta = {
     description = "In-application debugger for ARM Cortex microcontrollers";
     longDescription = ''
@@ -56,7 +60,7 @@ stdenv.mkDerivation rec {
     '';
     homepage = https://github.com/blacksphere/blackmagic;
     license = licenses.gpl3Plus;
-    maintainers = with maintainers; [ pjones ];
+    maintainers = with maintainers; [ pjones emily ];
     platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/tools/misc/blackmagic/helper.sh b/pkgs/development/tools/misc/blackmagic/helper.sh
index b4c7558885bb..991d0249e169 100755
--- a/pkgs/development/tools/misc/blackmagic/helper.sh
+++ b/pkgs/development/tools/misc/blackmagic/helper.sh
@@ -10,6 +10,8 @@ out=${out:-/tmp}
 
 ################################################################################
 export CFLAGS=$NIX_CFLAGS_COMPILE
+export MAKEFLAGS="\
+  ${enableParallelBuilding:+-j${NIX_BUILD_CORES} -l${NIX_BUILD_CORES}}"
 
 ################################################################################
 PRODUCTS="blackmagic.bin blackmagic.hex blackmagic_dfu.bin blackmagic_dfu.hex"
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0d02357f0030..cb586dad0b71 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9095,11 +9095,7 @@ in
   bison = bison3;
   yacc = bison; # TODO: move to aliases.nix
 
-  blackmagic = callPackage ../development/tools/misc/blackmagic {
-    stdenv = gcc6Stdenv;
-    gcc-arm-embedded = pkgsCross.arm-embedded.buildPackages.gcc;
-    binutils-arm-embedded = pkgsCross.arm-embedded.buildPackages.binutils;
-  };
+  blackmagic = callPackage ../development/tools/misc/blackmagic { };
 
   bloaty = callPackage ../development/tools/bloaty { };