[Cdrdao-devel] SOLUTION: ATAPI DMA writing with linux-2.6.x and cdrdao

[Harald W. <la...@gn...>]

Hi!

I was always annoyed that cdrtools/cdrecord can use the shiny new direct
ATAPI DMA with linux-2.6, but cdrecord cannot.  This evening I was
annoyed enough to dig a bit into the code and make it work.

In case you want to use the code, I've put a modified cdrdao-1.1.7
tarball to ftp://ftp.gnumonks.org/pub/patches/cdrdao-1.1.7atapi.tar.bz2

Support for DMA on ATAPI drives with Linux 2.5.x/2.6.x
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

I've done a very quick (and dirty) hack to make cdrdao support DMA cd writi=
ng
with ATAPI drives and the new 2.5.x / 2.6.x kernels.  Please don't tell me =
how
ugly this hack is, I know it ;)  I hope that 'official' direct ATAPI suppor=
t=20
will be added to cdrdao soon.

What I actually did, was:

- untar a clean cdrdao-1.1.7 tarball
- rm -rf scslib/*
- untar cdrtools-2.01a19.tat.bz2 inside scslib/
- remove everything not needed
- copy the 'export/' directory from the original cdrdao-1.1.7/scsilib/export
- write a scslib/TARGETS/55export file for the makefile magic
- hard-code "ATAPI" to the scg_open() call in ScsiIf-lib.cc

It's working now, although some weird features occur from time to time.

The system I'm running/testing this is an Apple Powerbook Titanium IV with =
a=20
MATSHITA DVD-R UJ-815A drive (flashed with OEM firmware to increase speed).
It also works on my dual G4 500 with a plextor PX-W4824A.

Both systems running debian testing.

Commands to be used:

cdrdao write --device ATAPI:0,0 /your/cuefile
cdrdao scanbus=20

SCREENSHOT:

# ./cdrdao scanbus
Cdrdao version 1.1.7 - (C) Andreas Mueller <an...@da...>
  SCSI interface library - (C) Joerg Schilling
  Paranoia DAE library - (C) Monty

Check http://cdrdao.sourceforge.net/drives.html#dt for current driver table=
s.

Using libscg version 'schily-0.7'

0,0,0: MATSHITA, DVD-R   UJ-815A, D101

--
- Harald Welte <la...@gn...>               http://www.gnumonks.org/
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
Programming is like sex: One mistake and you have to support it your lifeti=
me