Deprecate riscv gcc

.gitmodules

@@ -1,6 +1,3 @@
 [submodule "hw/tools/riscv-opcodes"]
 	path = hw/tools/riscv-opcodes
 	url = https://github.com/ucb-bar/riscv-opcodes.git
-[submodule "hw/tools/riscv-gcc"]
-	path = hw/tools/riscv-gcc
-	url = https://github.com/ucb-bar/riscv-gcc

README.md

@@ -16,18 +16,23 @@ As of november 2014 we are still building the hw infrastructure
 necessary to run a software stack on top of. So here we present only
 how to get started with hw-development.
 
-1. Install dependencies
+# Install packaged dependencies
 
    yaourt -S sbt texlive-most
 
-2. Enter the core directory
+# Install (yet) un-packaged dependencies
+
+  Install the GNU toolchain for RISC-V from
+  https://github.com/ucb-bar/riscv-gnu-toolchain
+
+# Enter the core directory
 
    cd hw/core
 
-3. Test your environment
+# Test your environment
 
    make alu.test
 
-4. Peruse the issue-tracker to see if there is anything that interests
+# Peruse the issue-tracker to see if there is anything that interests
 you or create your own issue based on what you want to contribute
 with. But most importantly; have fun!