Update README.md build dependencies based on bare system installs

These dependencies come from my experiments with Dockerfiles for
building op-build, which proved that our build-deps here were
a bit incomplete.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/README.md b/README.md
index 792109d..40aba23 100644
--- a/README.md
+++ b/README.md
@@ -13,25 +13,33 @@
 op-build palmetto_defconfig && op-build
 ```
 
+This will build an image for a Palmetto system. There exists default
+configurations for other platforms in openpower/configs/ such as
+Habanero and Firestone.
+
 ### Dependancies for *64-bit* Ubuntu/Debian systems
 
 1. Install Ubuntu (>= 14.04) or Debian (>= 7.5) 64-bit.
-2. Install the packages necessary for the build:
-```
-sudo apt-get install cscope ctags libz-dev libexpat-dev \
-  python language-pack-en texinfo \
-  build-essential g++ git bison flex unzip \
-  libxml-simple-perl libxml-sax-perl libxml2-dev libxml2-utils xsltproc
-```
+2. Enable Universe:
+
+        sudo apt-get install software-properties-common
+        sudo add-apt-repository universe
+3. Install the packages necessary for the build:
+
+        sudo apt-get install cscope ctags libz-dev libexpat-dev \
+          python language-pack-en texinfo \
+          build-essential g++ git bison flex unzip \
+          libxml-simple-perl libxml-sax-perl libxml2-dev libxml2-utils xsltproc \
+          wget bc
 
 ### Dependancies for *64-bit* Fedora systems
 
 1. Install Fedora 23 64-bit.
 2. Install the packages necessary for the build:
-```
-sudo dnf install vim gcc-c++ flex bison git ctags cscope expat-devel patch \
-  zlib-devel zlib-static make unzip tar bzip2 python wget cpio \
-  bc xz findutils perl-XML-Simple perl-Thread-Queue perl-Env   \
-  perl-XML-LibXML perl-Digest-SHA1 perl-bignum libxml2-devel   \
-  libxslt hostname
-```
+
+        sudo dnf install gcc-c++ flex bison git ctags cscope expat-devel patch \
+          zlib-devel zlib-static texinfo perl-bignum "perl(XML::Simple)" \
+          "perl(YAML)" "perl(XML::SAX)" "perl(Fatal)" "perl(Thread::Queue)" \
+          "perl(Env)" "perl(XML::LibXML)" "perl(Digest::SHA1)" libxml2-devel \
+          which wget unzip tar cpio python bzip2 bc findutils ncurses-devel
+
diff --git a/buildroot b/buildroot
index b7540b2..be97e23 160000
--- a/buildroot
+++ b/buildroot
@@ -1 +1 @@
-Subproject commit b7540b23bc01d6895c5cba1eaef53deba002087c
+Subproject commit be97e23318909d0f7c73158c5fb217862bbd763a