carl9170 firmware: update README.md

New version of the README in markdown. Includes additional
information about contact and firmware configuration.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>

diff --git a/README b/README
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-Community AR9170 Linux firmware
------------------------
-
-This is the firmware for the Atheros ar9170 802.11n devices.
-
-To build the firmware you will need an SH-2 toolchain.
-You can build your own toolchain:
-
-make -C toolchain
-
-but be aware that this will take some time and requires
-about 2.4 GiB disk space.
-
-The resulting firmware, carl9170.fw, can be used only
-with the carl9170 Linux driver.
-
-After getting a toolchain, you will need to get more
-tools & libs:
-
- * gcc 4.7+
-
- * gperf, bison/flex
-
- * cmake 2.8.4+
-
-afterwards, simply execute:
-
-autogen.sh
-
-to start the configuration and build process.
-
-if you want to "install" your own firmware, you can either
-do this manually, or by executing:
- 
-autogen.sh install
-
-This will place a copy with the right filename [adds API rev]
-into /lib/firmware/[the default path on most Distributions].
-

diff --git a/README.md b/README.md
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+# Community AR9170 Linux firmware
+
+## Introduction
+
+This is the firmware for the Atheros ar9170 802.11n devices.
+The firmware, carl9170.fw, can be used with the carl9170 Linux
+driver or the tools supplied in the repository.
+
+## Build
+
+### Build Toolchain
+
+To build the firmware you will need an SH-2 toolchain.
+You can use the makefile in this repository to build
+your own toolchain:
+
+`# make -C toolchain`
+
+but be aware that this will take some time and requires
+about 3-4 GiB disk space.
+
+### Build Firmware Image
+
+The firmware configuration and build process requires the following
+tools and libraries:
+
+ * gcc 4.7+
+
+ * gperf, bison/flex
+
+ * cmake 2.8.4+
+
+to start the configuration, run:
+
+`# autogen.sh`
+
+The configuration is based on the Linux's KConfig utility CLI.
+For each configurable option, a prompt will appear. To choose
+the default/previous option simply hit `<Enter>`-key on your
+keyboard.
+
+### Install Firmware
+
+if you want to "install" your own firmware, you can either
+do this manually, or by executing:
+
+`# autogen.sh install`
+
+This will place a copy with the right filename [adds API rev]
+into /lib/firmware/[the default path on most Distributions].
+
+## Contact
+
+If you have any questions, reports or patches, you should write
+to <linux-wireless@vger.kernel.org>.