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Subjectpatch (kernel 2.2.2): scsi DVD-RAM LF-D101
Date
From

> Linux version 2.2.2 (root@scotus) (gcc version 2.7.2.3) #6 Tue Feb 23 16:07:46 GMT 1999

Before the patch:
----------------

>(scsi0) <Adaptec AHA-294X Ultra2 SCSI host adapter> found at PCI 11/0
>(scsi0) Wide Channel, SCSI ID=7, 32/255 SCBs
>(scsi0) Downloading sequencer code... 407 instructions downloaded
>scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.10/3.2.4
<Adaptec AHA-294X Ultra2 SCSI host adapter>
>scsi : 1 host.
> Vendor: MATSHITA Model: PD-2 LF-D100 Rev: A109
> Type: CD-ROM ANSI SCSI revision: 02
>Detected scsi CD-ROM sr0 at scsi0, channel 0, id 4, lun 0
>(scsi0:0:4:0) Synchronous at 10.0 Mbyte/sec, offset 32.
>scsi : detected 1 SCSI cdrom total.
>sr0: scsi3-mmc drive: 0x/0x cd/rw xa/form2 cdda tray
>Uniform CDROM driver Revision: 2.52

<root> [~]
--> mount-dvd
mount: the kernel does not recognize /dev/sda as a block device
(maybe `insmod driver'?)
<root> [~]
-->

After the patch:
---------------

>(scsi0) <Adaptec AHA-294X Ultra2 SCSI host adapter> found at PCI 11/0
>(scsi0) Wide Channel, SCSI ID=7, 32/255 SCBs
>(scsi0) Downloading sequencer code... 407 instructions downloaded
>scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.1.10/3.2.4
> <Adaptec AHA-294X Ultra2 SCSI host adapter>
>scsi : 1 host.
> Vendor: MATSHITA Model: PD-2 LF-D100 Rev: A109
> Type: Optical Device ANSI SCSI revision: 02
>Detected scsi removable disk sda at scsi0, channel 0, id 4, lun 0
>(scsi0:0:4:0) Synchronous at 10.0 Mbyte/sec, offset 32.
> Vendor: MATSHITA Model: PD-2 LF-D100 Rev: A109
> Type: CD-ROM ANSI SCSI revision: 02
>Detected scsi CD-ROM sr0 at scsi0, channel 0, id 4, lun 0
>scsi : detected 1 SCSI cdrom 1 SCSI disk total.
>sr0: scsi3-mmc drive: 0x/0x cd/rw xa/form2 cdda tray
>Uniform CDROM driver Revision: 2.52
>SCSI device sda: hdwr sector= 2048 bytes. Sectors= 1218960 [2380 MB] [2.4 GB]
>sda: Write Protect is off

<root> [~]
--> mount /dev/sda /mnt/dvd
<root> [~]
--> df
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/hda2 2478169 1483223 866828 63% /
/dev/hda3 1981000 1481090 397496 79% /home
/dev/hda1 1539180 880156 659024 57% /mnt/Win98
/dev/sda 2360970 1360364 878710 61% /mnt/dvd
<root> [~]
--> cat /etc/fstab
/dev/hda4 swap swap defaults 0 0
/dev/hda2 / ext2 defaults 1 1
/dev/hda3 /home ext2 defaults 1 1
/dev/hda1 /mnt/Win98 vfat defaults 1 0
/dev/sda /mnt/dvd ext2 user,noauto,rw,suid,exec 0 0
none /proc proc defaults 0 0
<root> [~]
-->

The patch:
---------

<root> [/usr/src/linux/drivers/scsi]
--> diff --context=3 scsi.c scsi.c~

*** scsi.c Tue Feb 23 16:39:29 1999
--- scsi.c~ Tue Feb 23 16:34:30 1999
***************
*** 629,653 ****
Scsi_Device * SDtail, *SDpnt=*SDpnt2;
int bflags, type=-1;

- static int PANA_DVD_RAM[2] = {-1,-1};
- int org_lun = lun;
SDpnt->host = shpnt;
SDpnt->id = dev;
SDpnt->lun = lun;
SDpnt->channel = channel;
SDpnt->online = TRUE;

- /* MATSUSHITA DVD-RAM LF-D100 */
- if (PANA_DVD_RAM[0] == channel && PANA_DVD_RAM[1] == dev && lun == 1) {
- /* get CD-ROM type */
- SDpnt->lun = lun = 0;
- } else {
- /* clear status */
- PANA_DVD_RAM[0] = -1;
- PANA_DVD_RAM[1] = -1;
- }
/* Some low level driver could use device->type (DB) */
SDpnt->type = -1;

--- 629,640 ----
***************
*** 749,769 ****
scsi_result[1] |= 0x80; /* removable */
}

- if (!strncmp (scsi_result + 8, "MATSHITA", 8) &&
- !strncmp (scsi_result + 16, "PD-2 LF-D100", 12) &&
- scsi_result[0] == TYPE_ROM) {
- if (PANA_DVD_RAM[0] == channel && PANA_DVD_RAM[1] == dev && org_lun == 1) {
- /* MATSUSHITA DVD-RAM LF-D100 treats as ROM */
- lun = 1;
- } else {
- /* MATSUSHITA DVD-RAM LF-D100 treats as MOD */
- scsi_result[0] = TYPE_MOD;
- scsi_result[1] |= 0x80; /* removable */
- PANA_DVD_RAM[0] = channel;
- PANA_DVD_RAM[1] = dev;
- }
- }
memcpy (SDpnt->vendor, scsi_result + 8, 8);
memcpy (SDpnt->model, scsi_result + 16, 16);
memcpy (SDpnt->rev, scsi_result + 32, 4);
--- 736,741 ----
***************
*** 947,959 ****
return 1;
}

- /* MATSUSHITA DVD-RAM LF-D100 */
- if (PANA_DVD_RAM[0] == channel && PANA_DVD_RAM[1] == dev && org_lun == 1)
- {
- *max_dev_lun = 2;
- return 1;
- }
/*
* If this device is known to support multiple units, override the other
* settings, and scan all of them.
--- 919,924 ----
***************
*** 962,968 ****
*max_dev_lun = 8;
return 1;
}
/*
* We assume the device can't handle lun!=0 if: - it reports scsi-0 (ANSI
* SCSI Revision 0) (old drives like MAXTOR XT-3280) or - it reports scsi-1
--- 927,932 ----


Acknowledgments:
---------------

> Tam Tai Wai <thor@netvigator.com>
> http://www.jaist.ac.jp/%7esight95/linux/dvd-ram/dvd-ram.html

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