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This driver is for Compaq's SMART2 Intelligent Disk Array Controllers.

Supported Cards:
----------------

This driver is known to work with the following cards:

        * SMART (EISA)
        * SMART-2/E (EISA)
        * SMART-2/P
        * SMART-2DH
        * SMART-2SL
        * SMART-221
        * SMART-3100ES
        * SMART-3200
        * Integrated Smart Array Controller
        * SA 4200
        * SA 4250ES
        * SA 431
        * RAID LC2 Controller

It should also work with some really old Disk array adapters, but I am
unable to test against these cards:

        * IDA
        * IDA-2
        * IAES

Installing:
-----------

You need to build a new kernel to use this device, even if you want to
use a loadable module.  

Apply the patch to a 2.2.x kernel:

# cd linux
# patch -p1 <smart2.patch

Then build a new kernel and turn on Compaq SMART2 Disk Array support.
Create device nodes for the diskarray device:

# mkdev.ida [ctlrs]

Where ctlrs is the number of controllers you have (defaults to 1 if not
specified).

EISA Controllers:
-----------------

If you want to use an EISA controller you'll have to supply some
insmod/lilo paramaters.  If the driver is compiled into the kernel, must
give it the controller's IO port address at boot time (it is no longer
necessary to specifiy the IRQ).  For example, if you had two SMART-2/E
controllers, in EISA slots 1 and 2 you'd give it a boot argument like
this:

        smart2=0x1000,0x2000

If you were loading the driver as a module, you'd give load it like this:

        insmod cpqarray.o eisa=0x1000,0x2000

You can use EISA and PCI adapters at the same time.

Booting:
--------

You'll need to use a modified lilo if you want to boot from a disk array.
Its simply a version of lilo with some code added to tell it how to
understand Compaq diskarray devices.

Device Naming:
--------------

You need some entries in /dev for the ida device.  The mkdev.ida script
can make device nodes for you automatically.  Currently the device setup
is as follows:

Major numbers:
        72      ida0
        73      ida1
        74      ida2
        etc...

Minor numbers:
        b7 b6 b5 b4 b3 b2 b1 b0
        |----+----| |----+----|
             |           |
             |           +-------- Partition ID (0=wholedev, 1-15 partition)
             |
             +-------------------- Logical Volume number

The suggested device naming scheme is:
/dev/ida/c0d0           Controller 0, disk 0, whole device
/dev/ida/c0d0p1         Controller 0, disk 0, partition 1
/dev/ida/c0d0p2         Controller 0, disk 0, partition 2
/dev/ida/c0d0p3         Controller 0, disk 0, partition 3

/dev/ida/c1d1           Controller 1, disk 1, whole device
/dev/ida/c1d1p1         Controller 1, disk 1, partition 1
/dev/ida/c1d1p2         Controller 1, disk 1, partition 2
/dev/ida/c1d1p3         Controller 1, disk 1, partition 3