Merge pull request #4 from steveklabnik/master

Add detailed setup instructions

README.md

@@ -7,3 +7,63 @@ I was inspired to download Rust and try to do this after seeing [zero.rs](https:
 It paints the screen bright red and then hangs. That's it:
 
 ![](http://i.imgur.com/NWRehJJ.png)
+
+## Setup
+
+You need a few things to run rustboot:
+
+1. `qemu`
+2. a cross-compiler for i386
+3. `nasm`
+4. Rust's `incoming` branch.
+
+### OSX
+
+To set things up on OSX, do this:
+
+Install `nasm` and `qemu` from homebrew:
+
+```bash
+$ brew install nasm
+$ brew install quemu
+```
+
+Install binutils from source.
+
+I personally keep things I manually compile limited to my home directory, so
+I use the `--prefix=/Users/steve` option. Put this wherever you want, of
+course.
+
+```bash
+$ wget 'ftp://sourceware.org/pub/binutils/snapshots/binutils-2.23.52.tar.bz2'
+$ ./configure --target=i386-elf --prefix=/Users/steve
+$ make && make install
+```
+
+To get edge Rust going, grab it from git:
+
+```bash
+$ git clone https://github.com/mozilla/rust
+$ cd rust
+$ git checkout incoming
+$ ./configure --prefix=/Users/steve
+$ make && make install
+```
+
+Same thing about the prefix applies.
+
+Then, just make sure that `~/bin` is in your `PATH`, if you're using a prefix.
+
+## Running it
+
+To compile, simply
+
+```bash
+$ make
+```
+
+To run,
+
+```bash
+$ make run
+```