stallion.txt

《嵌入式系统设计与实例开发实验教材二源码》Linux内核移植与编译实验

   mark the boards as using level triggered interrupts. Do this by replacing
   the "0" entry at field position 6 (the last field) in the board
   configuration structure with a "1". (This is the structure that defines
   the board type, I/O locations, etc. for each board). All boards that are
   sharing an interrupt must be set this way, and each board should have the
   same interrupt number specified here as well. Now build the module or
   kernel as you would normally.

2. When physically installing the boards into the system you must enter
   the system EISA configuration utility. You will need to install the EISA
   configuration files for *all* the EasyIO and EasyConnection 8/32 boards
   that are sharing interrupts. The Stallion EasyIO and EasyConnection 8/32
   EISA configuration files required are supplied by Stallion Technologies
   on the EASY Utilities floppy diskette (usually supplied in the box with
   the board when purchased. If not, you can pick it up from Stallion's FTP
   site, ftp.stallion.com). You will need to edit the board resources to
   choose level triggered interrupts, and make sure to set each board's
   interrupt to the same IRQ number.

You must complete both the above steps for this to work. When you reboot
or load the driver your EasyIO and EasyConnection 8/32 boards will be
sharing interrupts.


2.4 USING HIGH SHARED MEMORY

The EasyConnection 8/64-EI, ONboard and Stallion boards are capable of
using shared memory addresses above the usual 640K - 1Mb range. The ONboard
ISA and the Stallion boards can be programmed to use memory addresses up to
16Mb (the ISA bus addressing limit), and the EasyConnection 8/64-EI and
ONboard/E can be programmed for memory addresses up to 4Gb (the EISA bus
addressing limit).

The higher than 1Mb memory addresses are fully supported by this driver.
Just enter the address as you normally would for a lower than 1Mb address
(in the driver's board configuration structure).



2.5 TROUBLE SHOOTING

If a board is not found by the driver but is actually in the system then the
most likely problem is that the I/O address is wrong. Change the module load
argument for the loadable module form. Or change it in the driver stallion.c
or istallion.c configuration structure and rebuild the kernel or modules, or
change it on the board.

On EasyIO and EasyConnection 8/32 boards the IRQ is software programmable, so
if there is a conflict you may need to change the IRQ used for a board. There
are no interrupts to worry about for ONboard, Brumby or EasyConnection 8/64
(ISA, EISA and MCA) boards. The memory region on EasyConnection 8/64 and
ONboard boards is software programmable, but not on the Brumby boards.



3. USING THE DRIVERS

3.1 INTELLIGENT DRIVER OPERATION

The intelligent boards also need to have their "firmware" code downloaded
to them. This is done via a user level application supplied in the driver
utility package called "stlload". Compile this program wherever you dropped
the package files, by typing "make". In its simplest form you can then type

    ./stlload -i cdk.sys

in this directory and that will download board 0 (assuming board 0 is an
EasyConnection 8/64 or EasyConnection/RA board). To download to an
ONboard, Brumby or Stallion do:

    ./stlload -i 2681.sys

Normally you would want all boards to be downloaded as part of the standard
system startup. To achieve this, add one of the lines above into the
/etc/rc.d/rc.S or /etc/rc.d/rc.serial file. To download each board just add
the "-b <brd-number>" option to the line. You will need to download code for
every board. You should probably move the stlload program into a system
directory, such as /usr/sbin. Also, the default location of the cdk.sys image
file in the stlload down-loader is /usr/lib/stallion. Create that directory
and put the cdk.sys and 2681.sys files in it. (It's a convenient place to put
them anyway). As an example your /etc/rc.d/rc.S file might have the
following lines added to it (if you had 3 boards):

    /usr/sbin/stlload -b 0 -i /usr/lib/stallion/cdk.sys
    /usr/sbin/stlload -b 1 -i /usr/lib/stallion/2681.sys
    /usr/sbin/stlload -b 2 -i /usr/lib/stallion/2681.sys

The image files cdk.sys and 2681.sys are specific to the board types. The
cdk.sys will only function correctly on an EasyConnection 8/64 board. Similarly
the 2681.sys image fill only operate on ONboard, Brumby and Stallion boards.
If you load the wrong image file into a board it will fail to start up, and
of course the ports will not be operational!

If you are using the modularized version of the driver you might want to put
the insmod calls in the startup script as well (before the download lines
obviously).


3.2 USING THE SERIAL PORTS

Once the driver is installed you will need to setup some device nodes to
access the serial ports. The simplest method is to use the stallion utility
"mkdevnods" script. It will automatically create device entries for Stallion
boards. This will create the normal serial port devices as /dev/ttyE# where
# is the port number starting from 0. A bank of 64 minor device numbers is
allocated to each board, so the first port on the second board is port 64,
etc. A set of callout type devices is also created. They are created as the
devices /dev/cue# where # is the same as for the ttyE devices.

For the most part the Stallion driver tries to emulate the standard PC system
COM ports and the standard Linux serial driver. The idea is that you should
be able to use Stallion board ports and COM ports interchangeably without
modifying anything but the device name. Anything that doesn't work like that
should be considered a bug in this driver!

If you look at the driver code you will notice that it is fairly closely
based on the Linux serial driver (linux/drivers/char/serial.c). This is
intentional, obviously this is the easiest way to emulate its behavior!

Since this driver tries to emulate the standard serial ports as much as
possible, most system utilities should work as they do for the standard
COM ports. Most importantly "stty" works as expected and "setserial" can
also be used (excepting the ability to auto-configure the I/O and IRQ
addresses of boards). Higher baud rates are supported in the usual fashion
through setserial or using the CBAUDEX extensions. Note that the EasyIO and
EasyConnection (all types) support at least 57600 and 115200 baud. The newer
EasyConnection XP modules and new EasyIO boards support 230400 and 460800
baud as well. The older boards including ONboard and Brumby support a
maximum baud rate of 38400.

If you are unfamiliar with how to use serial ports, then get the Serial-HOWTO
by Greg Hankins. It will explain everything you need to know!



4. NOTES

You can use both drivers at once if you have a mix of board types installed
in a system. However to do this you will need to change the major numbers
used by one of the drivers. Currently both drivers use major numbers 24, 25
and 28 for their devices. Change one driver to use some other major numbers,
and then modify the mkdevnods script to make device nodes based on those new
major numbers. For example, you could change the istallion.c driver to use
major numbers 60, 61 and 62. You will also need to create device nodes with
different names for the ports, for example ttyF# and cuf#.

The original Stallion board is no longer supported by Stallion Technologies.
Although it is known to work with the istallion driver.

Finding a free physical memory address range can be a problem. The older
boards like the Stallion and ONboard need large areas (64K or even 128K), so
they can be very difficult to get into a system. If you have 16 Mb of RAM
then you have no choice but to put them somewhere in the 640K -> 1Mb range.
ONboards require 64K, so typically 0xd0000 is good, or 0xe0000 on some
systems. If you have an original Stallion board, "V4.0" or Rev.O, then you
need a 64K memory address space, so again 0xd0000 and 0xe0000 are good.
Older Stallion boards are a much bigger problem. They need 128K of address
space and must be on a 128K boundary. If you don't have a VGA card then
0xc0000 might be usable - there is really no other place you can put them
below 1Mb.

Both the ONboard and old Stallion boards can use higher memory addresses as
well, but you must have less than 16Mb of RAM to be able to use them. Usual
high memory addresses used include 0xec0000 and 0xf00000.

The Brumby boards only require 16Kb of address space, so you can usually
squeeze them in somewhere. Common addresses are 0xc8000, 0xcc000, or in
the 0xd0000 range. EasyConnection 8/64 boards are even better, they only
require 4Kb of address space, again usually 0xc8000, 0xcc000 or 0xd0000
are good.

If you are using an EasyConnection 8/64-EI or ONboard/E then usually the
0xd0000 or 0xe0000 ranges are the best options below 1Mb. If neither of
them can be used then the high memory support to use the really high address
ranges is the best option. Typically the 2Gb range is convenient for them,
and gets them well out of the way.

The ports of the EasyIO-8M board do not have DCD or DTR signals. So these
ports cannot be used as real modem devices. Generally, when using these
ports you should only use the cueX devices.

The driver utility package contains a couple of very useful programs. One 
is a serial port statistics collection and display program - very handy
for solving serial port problems. The other is an extended option setting
program that works with the intelligent boards.



5. DISCLAIMER

The information contained in this document is believed to be accurate and
reliable. However, no responsibility is assumed by Stallion Technologies
Pty. Ltd. for its use, nor any infringements of patents or other rights
of third parties resulting from its use. Stallion Technologies reserves
the right to modify the design of its products and will endeavour to change
the information in manuals and accompanying documentation accordingly.