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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  -------------------------------------------------------------------------
  Release Notes for Linux on Intel's IXP2000 Network Processor
  
  Maintained by Deepak Saxena <dsaxena@plexity.net>
  -------------------------------------------------------------------------
  
  1. Overview
  
  Intel's IXP2000 family of NPUs (IXP2400, IXP2800, IXP2850) is designed
  for high-performance network applications such high-availability
  telecom systems. In addition to an XScale core, it contains up to 8
  "MicroEngines" that run special code, several high-end networking 
  interfaces (UTOPIA, SPI, etc), a PCI host bridge, one serial port,
  flash interface, and some other odds and ends. For more information, see:
0ea6e6112   Justin P. Mattock   Documentation: up... 
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  http://developer.intel.com
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  2. Linux Support
  
  Linux currently supports the following features on the IXP2000 NPUs:
  
  - On-chip serial
  - PCI
  - Flash (MTD/JFFS2)
  - I2C through GPIO
  - Timers (watchdog, OS)
  
  That is about all we can support under Linux ATM b/c the core networking
  components of the chip are accessed via Intel's closed source SDK. 
  Please contact Intel directly on issues with using those. There is
  also a mailing list run by some folks at Princeton University that might
  be of help:  https://lists.cs.princeton.edu/mailman/listinfo/ixp2xxx
  
  WHATEVER YOU DO, DO NOT POST EMAIL TO THE LINUX-ARM OR LINUX-ARM-KERNEL
  MAILING LISTS REGARDING THE INTEL SDK.
  
  3. Supported Platforms
  
  - Intel IXDP2400 Reference Platform
  - Intel IXDP2800 Reference Platform
  - Intel IXDP2401 Reference Platform
  - Intel IXDP2801 Reference Platform
  - RadiSys ENP-2611
  
  4. Usage Notes
  
  - The IXP2000 platforms usually have rather complex PCI bus topologies
    with large memory space requirements. In addition, b/c of the way the
    Intel SDK is designed, devices are enumerated in a very specific
    way. B/c of this this, we use "pci=firmware" option in the kernel
    command line so that we do not re-enumerate the bus.
  
  - IXDP2x01 systems have variable clock tick rates that we cannot determine 
    via HW registers. The "ixdp2x01_clk=XXX" cmd line options allow you
    to pass the clock rate to the board port.
  
  5. Thanks
  
  The IXP2000 work has been funded by Intel Corp. and MontaVista Software, Inc.
  
  The following people have contributed patches/comments/etc:
  
  Naeem F. Afzal
  Lennert Buytenhek
  Jeffrey Daly
  
  -------------------------------------------------------------------------
  Last Update: 8/09/2004