Add minimal-system-image-x86_64

This element produces a disk image that boots in QEMU. It has a kernel,
BusyBox, and little else; but should be suitable as a basis for more
grand endeavours.

This disk image we produce is 53MB. I spent a while trying to get this
as small as possible and this is as far as I got:

  * The boot partition seems to have a minimum size just over 32MB;
    lower than that and SYSLINUX fails to write the boot sector. The
    combined size of the initramfs and kernel is about 32MB, so I
    imagine that's what limits us.

  * The main partition is limited in size only by the amount of binaries
    that we put there.

  * We have a useless 40KB swap partition, which the x86image plugin
    insists on creating for us. Again 40KB is the minimum size that
    `mkswap` will allow. It's possible to override or modify the
    x86image plugin to avoid swap altogether but I'm not sure of the
    best way to proceed.

There are a few dependency cleanups in the bsp-generic stack; previously
we'd build the whole 'foundation' stack which took ages and wasn't
needed at all.

3 files changed, 67 insertions, 1 deletions

diff --git a/elements/bsp-generic/linux.bst b/elements/bsp-generic/linux.bst
index 536d6c1d..bac015a3 100644
--- a/elements/bsp-generic/linux.bst
+++ b/elements/bsp-generic/linux.bst
@@ -1,6 +1,9 @@
 kind: manual
+
 depends:
-- docutils.bst
+- filename: core.bst
+  type: build
+
 sources:
 - kind: git
   url: upstream:linux
diff --git a/elements/bsp-generic/nasm.bst b/elements/bsp-generic/nasm.bst
new file mode 100644
index 00000000..e78d422d
--- /dev/null
+++ b/elements/bsp-generic/nasm.bst
@@ -0,0 +1,20 @@
+kind: autotools
+
+depends:
+- gnu-toolchain.bst
+- filename: core/autoconf.bst
+  type: build
+- filename: docutils/asciidoc.bst
+  type: build
+- filename: docutils/xmlto.bst
+  type: build
+
+sources:
+- kind: git
+  url: upstream:nasm
+  track: nasm-2.11.08
+  ref: 8fa0fe16408afc76ce1ae4387e1a9d46893cfda6
+
+config:
+  install-commands:
+  - make INSTALLROOT="%{install-root}" install
diff --git a/elements/bsp-generic/syslinux.bst b/elements/bsp-generic/syslinux.bst
new file mode 100644
index 00000000..4ac1f98a
--- /dev/null
+++ b/elements/bsp-generic/syslinux.bst
@@ -0,0 +1,43 @@
+kind: manual
+
+depends:
+- gnu-toolchain.bst
+- filename: core/perl.bst
+  type: build
+- filename: python2-core.bst
+  type: build
+- filename: bsp-generic/nasm.bst
+  type: build
+
+sources:
+- kind: git
+  url: upstream:syslinux
+  track: baserock/syslinux-4.06-gcc7
+  ref: 02ab5d34ba0a90e3b6dd78034d7c470c77500119
+
+config:
+  build-commands:
+  - make clean
+  - make NO_WERROR=1
+  - make NO_WERROR=1 installer
+  install-commands:
+  - make INSTALLROOT="%{install-root}" MANDIR="%{mandir}" install
+
+public:
+  bst:
+    split-rules:
+      runtime:
+        (>):
+        - |
+          %{datadir}/syslinux
+        - |
+          %{datadir}/syslinux/*
+        - |
+          %{datadir}/syslinux/diag/*
+        - |
+          %{datadir}/syslinux/dosutil/*
+
+      devel:
+        (>):
+        - |
+          %{datadir}/syslinux/com32/**