Subversion Repositories or1k

        How to try to survive an IBM Mwave under Linux SB drivers

+       IBM have now released documentation of sorts and Torsten is busy

        trying to make the Mwave work. This is not however a trivial task.

----------------------------------------------------------------------------

OK, first thing - the IRQ problem IS a problem, whether the test is bypassed or

not.  It is NOT a Linux problem, but an MWAVE problem that is fixed with the

latest MWAVE patches. So, in other words, don't bypass the test for MWAVES!

I have Windows 95 on /dev/hda1, swap on /dev/hda2, and Red Hat 5 on /dev/hda3.

The steps, then:

    Boot to Linux.

    Mount Windows 95 file system (assume mount point = /dos95).

    mkdir /dos95/linux

    mkdir /dos95/linux/boot

    mkdir /dos95/linux/boot/parms

    Copy the kernel, any initrd image, and loadlin to /dos95/linux/boot/.

    Reboot to Windows 95.

    Edit C:/msdos.sys and add or change the following:

        Logo=0

        BootGUI=0

    Note that msdos.sys is a text file but it needs to be made 'unhidden',

    readable and writable before it can be edited.  This can be done with

    DOS' "attrib" command.

    Edit config.sys to have multiple config menus. I have one for windows 95 and

    five for Linux, like this:

------------

[menu]

menuitem=W95, Windows 95

menuitem=LINTP, Linux - ThinkPad

menuitem=LINTP3, Linux - ThinkPad Console

menuitem=LINDOC, Linux - Docked

menuitem=LINDOC3, Linux - Docked Console

menuitem=LIN1, Linux - Single User Mode

REM menudefault=W95,10

[W95]

[LINTP]

[LINDOC]

[LINTP3]

[LINDOC3]

[LIN1]

[COMMON]

FILES=30

REM Please read README.TXT in C:\MWW subdirectory before changing the DOS= statement.

DOS=HIGH,UMB

DEVICE=C:\MWW\MANAGER\MWD50430.EXE

SHELL=c:\command.com /e:2048

-------------------

The important things are the SHELL and DEVICE statements.

    Then change autoexec.bat. Basically everything in there originally should be

    done ONLY when Windows 95 is booted. Then you add new things specifically

    for Linux.  Mine is as follows

---------------

@ECHO OFF

if "%CONFIG%" == "W95" goto W95

REM

REM Linux stuff

REM

SET MWPATH=C:\MWW\DLL;C:\MWW\MWGAMES;C:\MWW\DSP

SET BLASTER=A220 I5 D1

SET MWROOT=C:\MWW

SET LIBPATH=C:\MWW\DLL

SET PATH=C:\WINDOWS;C:\MWW\DLL;

CALL MWAVE START NOSHOW

c:\linux\boot\loadlin.exe @c:\linux\boot\parms\%CONFIG%.par

:W95

REM

REM Windows 95 stuff

REM

c:\toolkit\guard

SET MSINPUT=C:\MSINPUT

SET MWPATH=C:\MWW\DLL;C:\MWW\MWGAMES;C:\MWW\DSP

REM The following is used by DOS games to recognize Sound Blaster hardware.

REM If hardware settings are changed, please change this line as well.

REM See the Mwave README file for instructions.

SET BLASTER=A220 I5 D1

SET MWROOT=C:\MWW

SET LIBPATH=C:\MWW\DLL

SET PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;E:\ORAWIN95\BIN;f:\msdev\bin;e:\v30\bin.dbg;v:\devt\v30\bin;c:\JavaSDK\Bin;C:\MWW\DLL;

SET INCLUDE=f:\MSDEV\INCLUDE;F:\MSDEV\MFC\INCLUDE

SET LIB=F:\MSDEV\LIB;F:\MSDEV\MFC\LIB

win

------------------------

Now build a file in c:\linux\boot\parms for each Linux config that you have.

For example, my LINDOC3 config is for a docked Thinkpad at runlevel 3 with no

initrd image, and has a parameter file named LINDOC3.PAR in c:\linux\boot\parms:

-----------------------

#   LOADLIN @param_file image=other_image root=/dev/other

#

#       Linux Console in docking station

#

c:\linux\boot\zImage.krn        # First value must be filename of Linux kernel.

root=/dev/hda3                  # device which gets mounted as root FS

ro                              # Other kernel arguments go here.

apm=off

doc=yes

3

-----------------------

The doc=yes parameter is an environment variable used by my init scripts, not

a kernel argument.

However, the apm=off parameter IS a kernel argument!  APM, at least in my setup,

causes the kernel to crash when loaded via loadlin (but NOT when loaded via

LILO). The APM stuff COULD be forced out of the kernel via the kernel compile

options. Instead, I got an unofficial patch to the APM drivers that allows them

to be dynamically deactivated via kernel arguments. Whatever you chose to

document, APM, it seems, MUST be off for setups like mine.

Now make sure C:\MWW\MWCONFIG.REF looks like this:

----------------------

[NativeDOS]

Default=SB1.5

SBInputSource=CD

SYNTH=FM

QSound=OFF

Reverb=OFF

Chorus=OFF

ReverbDepth=5

ChorusDepth=5

SBInputVolume=5

SBMainVolume=10

SBWaveVolume=10

SBSynthVolume=10

WaveTableVolume=10

AudioPowerDriver=ON

[FastCFG]

Show=No

HideOption=Off

-----------------------------

OR the Default= line COULD be

Default=SBPRO

Reboot to Windows 95 and choose Linux. When booted, use sndconfig to configure

the sound modules and voilą - ThinkPad sound with Linux.

Now the gotchas - you can either have CD sound OR Mixers but not both. That's a

problem with the SB1.5 (CD sound) or SBPRO (Mixers) settings. No one knows why

this is!

For some reason MPEG3 files, when played through mpg123, sound like they

are playing at 1/8th speed - not very useful!  If you have ANY insight

on why this second thing might be happening, I would be grateful.

===========================================================

    _/      _/_/_/_/

   _/_/  _/_/     _/

  _/ _/_/ _/_/_/_/      Martin John Bartlett

 _/  _/  _/     _/      (martin@nitram.demon.co.uk)

_/      _/_/_/_/

       _/

_/    _/

 _/_/

===========================================================