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    Revision 628 - (show annotations) (download)
    Wed Mar 4 10:48:58 2009 UTC (15 years, 2 months ago) by niro
    File size: 6548 byte(s) 
    import linux sources based on 2.6.12-alx-r9:
 -using linux-2.6.12.6
 -using 2.6.12-ck6 patch set
 -using fbsplash-0.9.2-r3
 -using vesafb-tng-0.9-rc7
 -using squashfs-2.2
 -added cddvd-cmdfilter-drop.patch as ck dropped it
 -added via-epia-dri (cle266) patch
 -added zd1211-svn-32 wlan driver (http://zd1211.ath.cx/download/)
 -added debian patches to zd1211 for wep256 etc
    1
    2 -------------------------------------------------------------------------
    3 Release Notes for Linux on Intel's IXP4xx Network Processor
    4
    5 Maintained by Deepak Saxena <dsaxena@plexity.net>
    6 -------------------------------------------------------------------------
    7
    8 1. Overview
    9
    10 Intel's IXP4xx network processor is a highly integrated SOC that
    11 is targeted for network applications, though it has become popular
    12 in industrial control and other areas due to low cost and power
    13 consumption. The IXP4xx family currently consists of several processors
    14 that support different network offload functions such as encryption,
    15 routing, firewalling, etc. The IXP46x family is an updated version which
    16 supports faster speeds, new memory and flash configurations, and more
    17 integration such as an on-chip I2C controller.
    18
    19 For more information on the various versions of the CPU, see:
    20
    21 http://developer.intel.com/design/network/products/npfamily/ixp4xx.htm
    22
    23 Intel also made the IXCP1100 CPU for sometime which is an IXP4xx
    24 stripped of much of the network intelligence.
    25
    26 2. Linux Support
    27
    28 Linux currently supports the following features on the IXP4xx chips:
    29
    30 - Dual serial ports
    31 - PCI interface
    32 - Flash access (MTD/JFFS)
    33 - I2C through GPIO on IXP42x
    34 - GPIO for input/output/interrupts
    35 See include/asm-arm/arch-ixp4xx/platform.h for access functions.
    36 - Timers (watchdog, OS)
    37
    38 The following components of the chips are not supported by Linux and
    39 require the use of Intel's propietary CSR softare:
    40
    41 - USB device interface
    42 - Network interfaces (HSS, Utopia, NPEs, etc)
    43 - Network offload functionality
    44
    45 If you need to use any of the above, you need to download Intel's
    46 software from:
    47
    48 http://developer.intel.com/design/network/products/npfamily/ixp425swr1.htm
    49
    50 DO NOT POST QUESTIONS TO THE LINUX MAILING LISTS REGARDING THE PROPIETARY
    51 SOFTWARE.
    52
    53 There are several websites that provide directions/pointers on using
    54 Intel's software:
    55
    56 http://ixp4xx-osdg.sourceforge.net/
    57 Open Source Developer's Guide for using uClinux and the Intel libraries
    58
    59 http://gatewaymaker.sourceforge.net/
    60 Simple one page summary of building a gateway using an IXP425 and Linux
    61
    62 http://ixp425.sourceforge.net/
    63 ATM device driver for IXP425 that relies on Intel's libraries
    64
    65 3. Known Issues/Limitations
    66
    67 3a. Limited inbound PCI window
    68
    69 The IXP4xx family allows for up to 256MB of memory but the PCI interface
    70 can only expose 64MB of that memory to the PCI bus. This means that if
    71 you are running with > 64MB, all PCI buffers outside of the accessible
    72 range will be bounced using the routines in arch/arm/common/dmabounce.c.
    73
    74 3b. Limited outbound PCI window
    75
    76 IXP4xx provides two methods of accessing PCI memory space:
    77
    78 1) A direct mapped window from 0x48000000 to 0x4bffffff (64MB).
    79 To access PCI via this space, we simply ioremap() the BAR
    80 into the kernel and we can use the standard read[bwl]/write[bwl]
    81 macros. This is the preffered method due to speed but it
    82 limits the system to just 64MB of PCI memory. This can be
    83 problamatic if using video cards and other memory-heavy devices.
    84
    85 2) If > 64MB of memory space is required, the IXP4xx can be
    86 configured to use indirect registers to access PCI This allows
    87 for up to 128MB (0x48000000 to 0x4fffffff) of memory on the bus.
    88 The disadvantadge of this is that every PCI access requires
    89 three local register accesses plus a spinlock, but in some
    90 cases the performance hit is acceptable. In addition, you cannot
    91 mmap() PCI devices in this case due to the indirect nature
    92 of the PCI window.
    93
    94 By default, the direct method is used for performance reasons. If
    95 you need more PCI memory, enable the IXP4XX_INDIRECT_PCI config option.
    96
    97 3c. GPIO as Interrupts
    98
    99 Currently the code only handles level-sensitive GPIO interrupts
    100
    101 4. Supported platforms
    102
    103 ADI Engineering Coyote Gateway Reference Platform
    104 http://www.adiengineering.com/productsCoyote.html
    105
    106 The ADI Coyote platform is reference design for those building
    107 small residential/office gateways. One NPE is connected to a 10/100
    108 interface, one to 4-port 10/100 switch, and the third to and ADSL
    109 interface. In addition, it also supports to POTs interfaces connected
    110 via SLICs. Note that those are not supported by Linux ATM. Finally,
    111 the platform has two mini-PCI slots used for 802.11[bga] cards.
    112 Finally, there is an IDE port hanging off the expansion bus.
    113
    114 Gateworks Avila Network Platform
    115 http://www.gateworks.com/avila_sbc.htm
    116
    117 The Avila platform is basically and IXDP425 with the 4 PCI slots
    118 replaced with mini-PCI slots and a CF IDE interface hanging off
    119 the expansion bus.
    120
    121 Intel IXDP425 Development Platform
    122 http://developer.intel.com/design/network/products/npfamily/ixdp425.htm
    123
    124 This is Intel's standard reference platform for the IXDP425 and is
    125 also known as the Richfield board. It contains 4 PCI slots, 16MB
    126 of flash, two 10/100 ports and one ADSL port.
    127
    128 Intel IXDP465 Development Platform
    129 http://developer.intel.com/design/network/products/npfamily/ixdp465.htm
    130
    131 This is basically an IXDP425 with an IXP465 and 32M of flash instead
    132 of just 16.
    133
    134 Intel IXDPG425 Development Platform
    135
    136 This is basically and ADI Coyote board with a NEC EHCI controller
    137 added. One issue with this board is that the mini-PCI slots only
    138 have the 3.3v line connected, so you can't use a PCI to mini-PCI
    139 adapter with an E100 card. So to NFS root you need to use either
    140 the CSR or a WiFi card and a ramdisk that BOOTPs and then does
    141 a pivot_root to NFS.
    142
    143 Motorola PrPMC1100 Processor Mezanine Card
    144 http://www.fountainsys.com/datasheet/PrPMC1100.pdf
    145
    146 The PrPMC1100 is based on the IXCP1100 and is meant to plug into
    147 and IXP2400/2800 system to act as the system controller. It simply
    148 contains a CPU and 16MB of flash on the board and needs to be
    149 plugged into a carrier board to function. Currently Linux only
    150 supports the Motorola PrPMC carrier board for this platform.
    151 See https://mcg.motorola.com/us/ds/pdf/ds0144.pdf for info
    152 on the carrier board.
    153
    154 5. TODO LIST
    155
    156 - Add support for Coyote IDE
    157 - Add support for edge-based GPIO interrupts
    158 - Add support for CF IDE on expansion bus
    159
    160 6. Thanks
    161
    162 The IXP4xx work has been funded by Intel Corp. and MontaVista Software, Inc.
    163
    164 The following people have contributed patches/comments/etc:
    165
    166 Lennerty Buytenhek
    167 Lutz Jaenicke
    168 Justin Mayfield
    169 Robert E. Ranslam
    170 [I know I've forgotten others, please email me to be added]
    171
    172 -------------------------------------------------------------------------
    173
    174 Last Update: 01/04/2005