Documentation/arch/arm/ixp4xx.rst

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Release Notes for Linux on Intel's IXP4xx Network Processor
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Maintained by Deepak Saxena <dsaxena@plexity.net>
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1. Overview

Intel's IXP4xx network processor is a highly integrated SOC that
is targeted for network applications, though it has become popular
in industrial control and other areas due to low cost and power
consumption. The IXP4xx family currently consists of several processors
that support different network offload functions such as encryption,
routing, firewalling, etc. The IXP46x family is an updated version which
supports faster speeds, new memory and flash configurations, and more
integration such as an on-chip I2C controller.

For more information on the various versions of the CPU, see:

   http://developer.intel.com/design/network/products/npfamily/ixp4xx.htm

Intel also made the IXCP1100 CPU for sometime which is an IXP4xx
stripped of much of the network intelligence.

2. Linux Support

Linux currently supports the following features on the IXP4xx chips:

- Dual serial ports
- PCI interface
- Flash access (MTD/JFFS)
- I2C through GPIO on IXP42x
- GPIO for input/output/interrupts
  See arch/arm/mach-ixp4xx/include/mach/platform.h for access functions.
- Timers (watchdog, OS)

The following components of the chips are not supported by Linux and
require the use of Intel's proprietary CSR software:

- USB device interface
- Network interfaces (HSS, Utopia, NPEs, etc)
- Network offload functionality

If you need to use any of the above, you need to download Intel's
software from:

   http://developer.intel.com/design/network/products/npfamily/ixp425.htm

DO NOT POST QUESTIONS TO THE LINUX MAILING LISTS REGARDING THE PROPRIETARY
SOFTWARE.

There are several websites that provide directions/pointers on using
Intel's software:

   - http://sourceforge.net/projects/ixp4xx-osdg/
     Open Source Developer's Guide for using uClinux and the Intel libraries

   - http://gatewaymaker.sourceforge.net/
     Simple one page summary of building a gateway using an IXP425 and Linux

   - http://ixp425.sourceforge.net/
     ATM device driver for IXP425 that relies on Intel's libraries

3. Known Issues/Limitations

3a. Limited inbound PCI window

The IXP4xx family allows for up to 256MB of memory but the PCI interface
can only expose 64MB of that memory to the PCI bus. This means that if

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Implementation Notes