linux/Documentation/arm/IXP2000
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   3Release Notes for Linux on Intel's IXP2000 Network Processor
   4
   5Maintained by Deepak Saxena <dsaxena@plexity.net>
   6-------------------------------------------------------------------------
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   81. Overview
   9
  10Intel's IXP2000 family of NPUs (IXP2400, IXP2800, IXP2850) is designed
  11for high-performance network applications such high-availability
  12telecom systems. In addition to an XScale core, it contains up to 8
  13"MicroEngines" that run special code, several high-end networking 
  14interfaces (UTOPIA, SPI, etc), a PCI host bridge, one serial port,
  15flash interface, and some other odds and ends. For more information, see:
  16
  17http://developer.intel.com/design/network/products/npfamily/ixp2xxx.htm
  18
  192. Linux Support
  20
  21Linux currently supports the following features on the IXP2000 NPUs:
  22
  23- On-chip serial
  24- PCI
  25- Flash (MTD/JFFS2)
  26- I2C through GPIO
  27- Timers (watchdog, OS)
  28
  29That is about all we can support under Linux ATM b/c the core networking
  30components of the chip are accessed via Intel's closed source SDK. 
  31Please contact Intel directly on issues with using those. There is
  32also a mailing list run by some folks at Princeton University that might
  33be of help:  https://lists.cs.princeton.edu/mailman/listinfo/ixp2xxx
  34
  35WHATEVER YOU DO, DO NOT POST EMAIL TO THE LINUX-ARM OR LINUX-ARM-KERNEL
  36MAILING LISTS REGARDING THE INTEL SDK.
  37
  383. Supported Platforms
  39
  40- Intel IXDP2400 Reference Platform
  41- Intel IXDP2800 Reference Platform
  42- Intel IXDP2401 Reference Platform
  43- Intel IXDP2801 Reference Platform
  44- RadiSys ENP-2611
  45
  464. Usage Notes
  47
  48- The IXP2000 platforms usually have rather complex PCI bus topologies
  49  with large memory space requirements. In addition, b/c of the way the
  50  Intel SDK is designed, devices are enumerated in a very specific
  51  way. B/c of this this, we use "pci=firmware" option in the kernel
  52  command line so that we do not re-enumerate the bus.
  53
  54- IXDP2x01 systems have variable clock tick rates that we cannot determine 
  55  via HW registers. The "ixdp2x01_clk=XXX" cmd line options allow you
  56  to pass the clock rate to the board port.
  57
  585. Thanks
  59
  60The IXP2000 work has been funded by Intel Corp. and MontaVista Software, Inc.
  61
  62The following people have contributed patches/comments/etc:
  63
  64Naeem F. Afzal
  65Lennert Buytenhek
  66Jeffrey Daly
  67
  68-------------------------------------------------------------------------
  69Last Update: 8/09/2004
  70