## <a name="HowTo_Build_OSKit_Mach"> </a> HowTo Build OSKit-Mach

<table align="center" width="75%">
  <tr>
    <td width="50%"> %TOC% </td>
    <td width="50%">
      <p><nop></nop></p>
      <h3><a name="Introduction"> Introduction </a></h3> This is a brief "<nop>HowTO build OSKit-Mach" (a.k.a GNUmach 2.0). It covers everything from getting the latest sources of both the <a href="http://www.cs.utah.edu/flux/oskit/" target="_top">OSKit</a> and the GNUmach kernel, down to building and debugging them. <p><a href="http://www.etherhogz.org/doc/oskit-mach.html" target="_top">Another guide</a> is also available. 5/29/2003 - This link appears to be broken - remove? </p>
        <p> To be able to actually make use of your recently checked out CVS version of the GNUMach kernel &amp;amp; c:o you need a GNU system of <a href="ftp://ftp.funet.fi/pub/gnu/alpha/gnu/hurd/contrib/marcus/gnu-20020816.tar.gz" target="_top">gnu-20020816.tar.gz</a> or later. See <span style="background:"><font color="">Tarball Notes Home</font></span><a href="http://LOCATIONDistrib/TarballNotesHome">?</a> for more info. </p></nop></td>
  </tr>
</table>

## <a name="Getting_your_hands_on_the_source"> Getting your hands on the source </a>

First you need to checkout the relevant sources. It comes in various flavours and the recommended way is to checkout from CVS.

### <a name="The_OSKit_Sources"> </a> The OSKit Sources

**_Note:_** The [Savannah OSKit](http://savannah.gnu.org/projects/oskit/) project is the recommended source today of the OSKit. Its CVS tree holds the official sources and all known patches, plus a few others.

**_Official Sources:_**

* St. Patricks day 2002 release: <ftp://flux.cs.utah.edu/flux/oskit/oskit-20020317.tar.gz>

* Valentine's day 2001 release: <ftp://flux.cs.utah.edu/flux/oskit/oskit-20010214.tar.gz>

**_Official Patches:_**

* Useful patches are available [[OskitPatches]] or on the nearest Debian FTP.

**_Savannah CVS:_**

The recommended document for accessing the Savannah OSKit CVS is <http://savannah.gnu.org/cvs?group=oskit>

Briefly, you need to setup a _different CVSROOT_ than the GNUmach and Mig sources below:

    $ export CVSROOT=":pserver:anoncvs@anoncvs.gnu.org:/cvsroot/oskit"
    $ cvs login              # Press Enter at the password prompt
    ...
    $ cvs -z3 co oskit

### <a name="GNUmach_amp_Mig_Sources"> </a> GNUmach &amp; Mig Sources

The recommended document for accessing the Hurd CVS on Savannah is at <http://savannah.gnu.org/cvs/?group=hurd>

This is only a brief restatement, which may be inaccurate. Setup your environment with the `CVSROOT` variable and login as anonymous. How you do this may differ between shells.

    $ export CVSROOT=":pserver:anoncvs@anoncvs.gnu.org:/cvsroot/hurd"
    $ cvs login              # Press Enter at the password prompt

**_Gnu Mach:_**

All development, apart from critical bug fixes, is done on the upcoming 2.0 release (OSKit/Mach). A potentially confusing point is that the code for OSKit/Mach (as opposed to the 1.X release, aka "GNU Mach") is now on the `TRUNK` of the 'gnumach' CVS module. In the past the trunk was 1.X (GNU Mach) and 2.0 (OSKit/Mach) was a branch.

    $ cvs -z3 co gnumach

In case you have been tracking the oskit-branch and want to move to the current `HEAD` branch you can issue the following instead to update your tree.

    $ cd <YOUR MACH DIR>
    $ cvs -z3 update -Pd -A

Where `<YOUR MACH DIR>` can be `gnumach`, `oskit-mach`, or similar. The `-A` is what moves you from a branch to the default (in this case HEAD), but without forcing a specific tag. `-P` Prunes your local copy from stale directories and `-d` creates new directories for you.

**_The Hurd servers:_**

In case you want to build the Hurd servers as well, you can check them out with:

    $ cvs -z3 co hurd

**_Inteface generator:_**

See the [[Mig/MachInterfaceGenerator]] for more information.

Check it out using

    $ cvs -z3 co mig

## <a name="Building"> Building </a>

The recommended versions of GCC are

<dl>
  <dt> For the OSKit</dt>
  <dd> GCC 2.95.X </dd>
  <dt> For GNUmach and <nop>MiG</nop></dt>
  <dd> GCC 3.2 </dd>
</dl>

### <a name="The_OSKit"> </a> The OSKit

Do _not_ forget to apply all known [[OskitPatches]] before starting the build! This does not apply if you use the OSKit from [Savannah](http://savannah.gnu.org/).

The attached [[ATTACHURLmodulesx86pc]], or [[ATTACHURLmodules-lightx86pc]], is an example setup, your needs may vary but this one works for standard COTS PC's. Now, how to configure and build the OSKit.

    $ cd oskit-20020317/
    $ mkdir build
    $ cd build
    $ CC=gcc-2.95                            \
      CFLAGS="-g"                            \
      ../configure --prefix=/usr/local       \
                   --enable-debug            \
                   --enable-modulefile=modules-light.x86.pc
    $ make
    $ sudo make install

Comment: Barry deFreese

For you newbies like me, I had problems using `modules.x86.pc.full` and `modules.x86.pc`. There seems to be problems with `examples/dyntest`. Make sure you pull down and use the [[ATTACHURLmodules-lightx86pc]].

Comment: Luis Miguel

I needed to apply another patch that is not in CVS yet. The patch is in this [message](http://mail.gnu.org/archive/html/bug-hurd/2003-06/msg00054.html) in the bug-hurd mailing list.

### <a name="Mach_Interface_Generator"> Mach Interface Generator </a>

To build any Mach kernel you need an interface generator, MiG. To be on the safe side, use the CVS version. If you use Debian, you can install package [mig-i386-gnu](http://packages.debian.org/mig-i386-gnu). If you don't use Debian or want to compile MiG by yourself on Linux/\*BSD system, you must first install Mach headers. In Mach directory do:

    $ mkdir build
    $ cd build
    $ ../configure --prefix=/usr            # Default prefix is / !
    $ sudo make -k install-headers          # -k is for ignoring errors

Now you are ready to compile and install MiG (commands are in Mig's source directory):

    $ automake --add-missing                # sometimes it's needed
    $ mkdir build
    $ cd build
    $ ../configure
    $ make
    $ sudo make install

### <a name="GNUmach_2_0_OSKit_Mach_"> </a> GNUmach 2.0 (OSKit-Mach)

Unlike its half sister, the OSKit-Mach kernel does _not_ need a cross compiler. The regular gcc for your x86 Linux system does just fine. However, you might want to use gcc 3.2 with the latest and greatest CVS version of Mach.

**_Configuring:_**

    $ cd gnumach
    $ mkdir build
    $ cd build
    $ MIG=/usr/local/bin/mig                   \
      CC=gcc-3.2                               \
      CFLAGS="-g -O2"                          \
      OSKIT_LIBDIR=/usr/local/lib/oskit        \
      ../configure --prefix=/gnu

Comment: Barry deFreese

I updated `CFLAGS` to `CFLAGS="-g -O2"`. Using just `-O` I was getting errors in the `machine_init` function. For newbies like me, the `-g` is only needed if you want to enable debugging. The `-O2` is Oh 2, not Zero 2.

**_Building:_**

Instead of using `make kernel` to build kernel, in OSKit-Mach you have to use <code>make kernel-<var>DRIVERS</var></code>, where <var>DRIVERS</var> is <code><var>DRIVER</var>+<var>DRIVER</var>+...+<var>DRIVER</var></code> (a list of drivers separated by `+`). <var>DRIVER</var> can be one of:

* `ide`
* `floppy`
* <code>ethernet\_<var>ETHDRV</var></code> where <var>ETHDRV</var> is taken from `oskit/oskit/dev/linux_ethernet.h`.
* <code>scsi\_<var>SCSIDRV</var></code> where <var>SCSIDRV</var> is taken from `oskit/oskit/dev/linux_scsi.h`.

Thus, to build a IDE capable kernel with 3Com Vortex Boomerang support you use the following:

    $ make kernel-ide+ethernet_vortex
    $ sudo make install
    $ sudo gzip -f /gnu/boot/oskit-mach

If the `make` command complains about missing dependencies, then you haven't passed correct `OSKIT_LIBDIR` variable to the `configure` script. Or you can use the patch below and pass something like `--with-oskit=/usr/local` to `configure`.

Comment: Barry deFreese

If you receive an error like `No rule to make target Kernel-ide...`, there is a patch for an issue with finding the oskit libraries. Then run `configure` on gnumach again with the option `--with-oskit=/path/to/oskit/libraries`.

The patch can be found here: [gnumach-oskit-path.patch](http://www.vis.ethz.ch/~wagi/hurd/gnumach/gnumach-oskit-path.patch) Thanks wagi!!

Don't use both `--with-oskit` and `OSKIT_LIBDIR`. Choose one of these methods.

If you want to use tftp to download the kernel from Grub and don't care about the symbols I recommend either stripping or removing the `--enable-debug` and `-g` statements.

## <a name="Debugging"> Debugging </a>

See the [[Mach/RemoteDebugOskitMach]] page.

## <a name="Attachments"> Attachments </a>

* [[ATTACHURLmodulesx86pc]]: Modules to build in OSKit
* [[ATTACHURLmodules-lightx86pc]]: Lighter version of required modules for building GNUmach