Printer Tape Devices on the DEC Alpha
Kernel mods are not necessary. They are, however, useful for debugging
studio/mps hardware problems because that's the only way for the
computer to print out a list of what's on the chain. More on kernel
mods later. For now, let me show you what's required:
- Go into /dev as root.
- Run "./MAKEDEV tzX" where X is the scsi ID of the
mps. This will create the next available rmt devices. Digital
unix doesn't really care what the numbers are so it assigns them
in numerical order. So, if this is the first tape drive you're
installing on this system, the device names are going to be rmt0x
where x is either 'a', 'h', 'l', or 'm' (auto, high, low, or medium
densities, for studio, use high). If it's the second tape drive,
the MAKEDEV command will make rmt1x devices.
- Look at the devices you just created and their major and minor
numbers. You will notice that the "high density, auto-rewind"
device has a minor number of X * 1024 where 'X' is the scsi ID
of the device (ie. 4096 for scsi ID 4). Keep this in mind for
the next step.
- To make the printer tape device on the studio, add 128 to the
minor device number and use that to make another device. For example,
if /dev/rmt0h had a major number of 9 and a minor number of 4096,
you would execute the following command to create the printer
device:
mknod /dev/rmt0_2h c 9 4224
chmod 666 /dev/rmt0_2h
- For mountback (pre-CD Studio+; legacy CD Studio only), the
idea is the same except you only add 64 to the minor number. If
/dev/rz4a had a major number of 8 and a minor number of 4096,
then you would create the mountback device by doing:
For the block devices:
mknod /dev/rz4_1a b 8 4160
chmod 600 /dev/rz4_1a
For the character(raw) devices:
mknod /dev/rrz4_1a b 8 4160
chmod 600 /dev/rrz4_1a
Kernel Modifications
The following is only necessary if you feel the Studio isn't being
seen or some other scsi-id number related problem. Go into /sys/conf
and copy the current configuration file to some new name. This is
a lot like the SunOS portion of a kernel config. Add the devices
that correspond to the Studio or MPS. A good example if a Studio
is at scsi ID 4:
|
device disk
|
rz4
|
at scsi0
|
drive 33
|
|
device tape
|
tz4
|
at scsi0
|
drive 32
|
|
device tape
|
tz4
|
at scsi0
|
drive 34
|
Note that the two tape device names are the same. This is not a
typo. You will also find that if there's a hard drive configured
at ID 4, that will have the same name as your mountback device.
Run "./config". "cd" to "../{kernel_name}"
and type make. You now have a kernel that will show the device names
at boot time. Save the old kernel and move the new kernel into place
and reboot. Keep in mind that the alpha doesn't show the device
names on the screen forever. They are, however, kept in the /var/adm/messages
log file (if the system logging hasn't been changed).
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