| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | |
| 2 | ------------------------------------------------------------------------- |
| 3 | Release Notes for Linux on Intel's IXP2000 Network Processor |
| 4 | |
| 5 | Maintained by Deepak Saxena <dsaxena@plexity.net> |
| 6 | ------------------------------------------------------------------------- |
| 7 | |
| 8 | 1. Overview |
| 9 | |
| 10 | Intel's IXP2000 family of NPUs (IXP2400, IXP2800, IXP2850) is designed |
| 11 | for high-performance network applications such high-availability |
| 12 | telecom systems. In addition to an XScale core, it contains up to 8 |
| 13 | "MicroEngines" that run special code, several high-end networking |
| 14 | interfaces (UTOPIA, SPI, etc), a PCI host bridge, one serial port, |
| 15 | flash interface, and some other odds and ends. For more information, see: |
| 16 | |
| 17 | http://developer.intel.com/design/network/products/npfamily/ixp2xxx.htm |
| 18 | |
| 19 | 2. Linux Support |
| 20 | |
| 21 | Linux 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 | |
| 29 | That is about all we can support under Linux ATM b/c the core networking |
| 30 | components of the chip are accessed via Intel's closed source SDK. |
| 31 | Please contact Intel directly on issues with using those. There is |
| 32 | also a mailing list run by some folks at Princeton University that might |
| 33 | be of help: https://lists.cs.princeton.edu/mailman/listinfo/ixp2xxx |
| 34 | |
| 35 | WHATEVER YOU DO, DO NOT POST EMAIL TO THE LINUX-ARM OR LINUX-ARM-KERNEL |
| 36 | MAILING LISTS REGARDING THE INTEL SDK. |
| 37 | |
| 38 | 3. 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 | |
| 46 | 4. 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 | |
| 58 | 5. Thanks |
| 59 | |
| 60 | The IXP2000 work has been funded by Intel Corp. and MontaVista Software, Inc. |
| 61 | |
| 62 | The following people have contributed patches/comments/etc: |
| 63 | |
| 64 | Naeem F. Afzal |
| 65 | Lennert Buytenhek |
| 66 | Jeffrey Daly |
| 67 | |
| 68 | ------------------------------------------------------------------------- |
| 69 | Last Update: 8/09/2004 |