[PATCH 3/3] mini-os: update README to reflect recent changes

[Juergen Gross <jgross@suse.com>]

Add some notes to README regarding configuration of Mini-OS via config
files.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 README | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/README b/README
index 7e9c07a..abd8440 100644
--- a/README
+++ b/README
@@ -19,6 +19,37 @@ This includes:
 
 - to build it just type make.
 
+- Mini-OS can be configured in various ways by specifying a config file:
+
+  MINIOS_CONFIG=config-file make
+
+  config-file can contain various CONFIG_* items set to either "y" or "n".
+  Their defaults can be found in Config.mk.
+  It is possible to specify the interface version of Xen via setting
+
+  XEN_INTERFACE_VERSION=<version>
+
+  in the config file. This defaults to 0x00030205, which is the minimal
+  version supported. The latest available version is specified by setting
+
+  XEN_INTERFACE_VERSION=__XEN_LATEST_INTERFACE_VERSION__
+
+- By typing
+
+  make testbuild
+
+  it is possible to test builds of various configurations. This should be
+  done always after modifying Mini-OS.
+
+  The configurations which are build tested can be found in the directory
+  arch/*/testbuild with one file per configuration. Those configurations are
+  being built for each sub-architecture (e.g. x86_32 and x86_64 for the
+  x86 architecture).
+
+  Please update the current configuration files when adding a new CONFIG_
+  item and maybe even add a new configuration file if the new item interacts
+  with other CONFIG_ items.
+
 - to build it with TCP/IP support, download LWIP 1.3.2 source code and type
 
   make LWIPDIR=/path/to/lwip/source
-- 
2.6.6


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