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diff --git a/Documentation/arm/IXP4xx b/Documentation/arm/IXP4xx deleted file mode 100644 index e48b74de6ac0..000000000000 --- a/Documentation/arm/IXP4xx +++ /dev/null @@ -1,172 +0,0 @@ - -------------------------------------------------------------------------- -Release Notes for Linux on Intel's IXP4xx Network Processor - -Maintained by Deepak Saxena <dsaxena@plexity.net> -------------------------------------------------------------------------- - -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 -you are running with > 64MB, all PCI buffers outside of the accessible -range will be bounced using the routines in arch/arm/common/dmabounce.c. - -3b. Limited outbound PCI window - -IXP4xx provides two methods of accessing PCI memory space: - -1) A direct mapped window from 0x48000000 to 0x4bffffff (64MB). - To access PCI via this space, we simply ioremap() the BAR - into the kernel and we can use the standard read[bwl]/write[bwl] - macros. This is the preffered method due to speed but it - limits the system to just 64MB of PCI memory. This can be - problamatic if using video cards and other memory-heavy devices. - -2) If > 64MB of memory space is required, the IXP4xx can be - configured to use indirect registers to access PCI This allows - for up to 128MB (0x48000000 to 0x4fffffff) of memory on the bus. - The disadvantage of this is that every PCI access requires - three local register accesses plus a spinlock, but in some - cases the performance hit is acceptable. In addition, you cannot - mmap() PCI devices in this case due to the indirect nature - of the PCI window. - -By default, the direct method is used for performance reasons. If -you need more PCI memory, enable the IXP4XX_INDIRECT_PCI config option. - -3c. GPIO as Interrupts - -Currently the code only handles level-sensitive GPIO interrupts - -4. Supported platforms - -ADI Engineering Coyote Gateway Reference Platform -http://www.adiengineering.com/productsCoyote.html - - The ADI Coyote platform is reference design for those building - small residential/office gateways. One NPE is connected to a 10/100 - interface, one to 4-port 10/100 switch, and the third to and ADSL - interface. In addition, it also supports to POTs interfaces connected - via SLICs. Note that those are not supported by Linux ATM. Finally, - the platform has two mini-PCI slots used for 802.11[bga] cards. - Finally, there is an IDE port hanging off the expansion bus. - -Gateworks Avila Network Platform -http://www.gateworks.com/support/overview.php - - The Avila platform is basically and IXDP425 with the 4 PCI slots - replaced with mini-PCI slots and a CF IDE interface hanging off - the expansion bus. - -Intel IXDP425 Development Platform -http://www.intel.com/design/network/products/npfamily/ixdpg425.htm - - This is Intel's standard reference platform for the IXDP425 and is - also known as the Richfield board. It contains 4 PCI slots, 16MB - of flash, two 10/100 ports and one ADSL port. - -Intel IXDP465 Development Platform -http://www.intel.com/design/network/products/npfamily/ixdp465.htm - - This is basically an IXDP425 with an IXP465 and 32M of flash instead - of just 16. - -Intel IXDPG425 Development Platform - - This is basically and ADI Coyote board with a NEC EHCI controller - added. One issue with this board is that the mini-PCI slots only - have the 3.3v line connected, so you can't use a PCI to mini-PCI - adapter with an E100 card. So to NFS root you need to use either - the CSR or a WiFi card and a ramdisk that BOOTPs and then does - a pivot_root to NFS. - -Motorola PrPMC1100 Processor Mezanine Card -http://www.fountainsys.com - - The PrPMC1100 is based on the IXCP1100 and is meant to plug into - and IXP2400/2800 system to act as the system controller. It simply - contains a CPU and 16MB of flash on the board and needs to be - plugged into a carrier board to function. Currently Linux only - supports the Motorola PrPMC carrier board for this platform. - -5. TODO LIST - -- Add support for Coyote IDE -- Add support for edge-based GPIO interrupts -- Add support for CF IDE on expansion bus - -6. Thanks - -The IXP4xx work has been funded by Intel Corp. and MontaVista Software, Inc. - -The following people have contributed patches/comments/etc: - -Lennerty Buytenhek -Lutz Jaenicke -Justin Mayfield -Robert E. Ranslam -[I know I've forgotten others, please email me to be added] - -------------------------------------------------------------------------- - -Last Update: 01/04/2005 |