CRIS: Update documentation

Linux 2.4 on the CRIS architecture

==================================

$Id: README,v 1.7 2001/04/19 12:38:32 bjornw Exp $

Linux on the CRIS architecture

==============================

This is a port of Linux 2.4 to Axis Communications ETRAX 100LX embedded 

network CPU. For more information about CRIS and ETRAX please see further

below.

This is a port of Linux to Axis Communications ETRAX 100LX,

ETRAX FS and ARTPEC-3 embedded network CPUs.

For more information about CRIS and ETRAX please see further below.

In order to compile this you need a version of gcc with support for the

ETRAX chip family. Please see this link for more information on how to

download the compiler and other tools useful when building and booting

software for the ETRAX platform:

http://developer.axis.com/doc/software/devboard_lx/install-howto.html

<more specific information should come in this document later>

http://developer.axis.com/wiki/doku.php?id=axis:install-howto-2_20

What is CRIS ?

--------------

CRIS is an acronym for 'Code Reduced Instruction Set'. It is the CPU

architecture in Axis Communication AB's range of embedded network CPU's,

called ETRAX. The latest CPU is called ETRAX 100LX, where LX stands for

'Linux' because the chip was designed to be a good host for the Linux

operating system.

called ETRAX.

The ETRAX 100LX chip

--------------------

For reference, please see the press-release:

For reference, please see the following link:

http://www.axis.com/news/us/001101_etrax.htm

http://www.axis.com/products/dev_etrax_100lx/index.htm

The ETRAX 100LX is a 100 MIPS processor with 8kB cache, MMU, and a very broad

range of built-in interfaces, all with modern scatter/gather DMA.

	(not all interfaces are available at the same time due to chip pin

         multiplexing)

The previous version of the ETRAX, the ETRAX 100, sits in almost all of

Axis shipping thin-servers like the Axis 2100 web camera or the ETRAX 100

developer-board. It lacks an MMU so the Linux we run on that is a version

of uClinux (Linux 2.0 without MM-support) ported to the CRIS architecture.

The new Linux 2.4 port has full MM and needs a CPU with an MMU, so it will

not run on the ETRAX 100.

ETRAX 100LX is CRISv10 architecture.

The ETRAX FS and ARTPEC-3 chips

-------------------------------

The ETRAX FS is a 200MHz 32-bit RISC processor with on-chip 16kB

I-cache and 16kB D-cache and with a wide range of device interfaces

including multiple high speed serial ports and an integrated USB 1.1 PHY.

A version of the Axis developer-board with ETRAX 100LX (running Linux

2.4) is now available. For more information please see developer.axis.com.

The ARTPEC-3 is a variant of the ETRAX FS with additional IO-units

used by the Axis Communications network cameras.

See below link for more information:

http://www.axis.com/products/dev_etrax_fs/index.htm

ETRAX FS and ARTPEC-3 are both CRISv32 architectures.

Bootlog

-------

-rwxr-xr-x  1 342      100         16252  Jan 01 00:00 telnetd

(All programs are statically linked to the libc at this point - we have not ported the

 shared libraries yet)