de4x5.txt
上传用户：lgb322
上传日期：2013-02-24
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- Originally, this driver was written for the Digital Equipment
- Corporation series of EtherWORKS Ethernet cards:
- DE425 TP/COAX EISA
- DE434 TP PCI
- DE435 TP/COAX/AUI PCI
- DE450 TP/COAX/AUI PCI
- DE500 10/100 PCI Fasternet
- but it will now attempt to support all cards which conform to the
- Digital Semiconductor SROM Specification. The driver currently
- recognises the following chips:
- DC21040 (no SROM)
- DC21041[A]
- DC21140[A]
- DC21142
- DC21143
- So far the driver is known to work with the following cards:
- KINGSTON
- Linksys
- ZNYX342
- SMC8432
- SMC9332 (w/new SROM)
- ZNYX31[45]
- ZNYX346 10/100 4 port (can act as a 10/100 bridge!)
- The driver has been tested on a relatively busy network using the DE425,
- DE434, DE435 and DE500 cards and benchmarked with 'ttcp': it transferred
- 16M of data to a DECstation 5000/200 as follows:
- TCP UDP
- TX RX TX RX
- DE425 1030k 997k 1170k 1128k
- DE434 1063k 995k 1170k 1125k
- DE435 1063k 995k 1170k 1125k
- DE500 1063k 998k 1170k 1125k in 10Mb/s mode
- All values are typical (in kBytes/sec) from a sample of 4 for each
- measurement. Their error is +/-20k on a quiet (private) network and also
- depend on what load the CPU has.
- =========================================================================
- The ability to load this driver as a loadable module has been included
- and used extensively during the driver development (to save those long
- reboot sequences). Loadable module support under PCI and EISA has been
- achieved by letting the driver autoprobe as if it were compiled into the
- kernel. Do make sure you're not sharing interrupts with anything that
- cannot accommodate interrupt sharing!
- To utilise this ability, you have to do 8 things:
- 0) have a copy of the loadable modules code installed on your system.
- 1) copy de4x5.c from the /linux/drivers/net directory to your favourite
- temporary directory.
- 2) for fixed autoprobes (not recommended), edit the source code near
- line 5594 to reflect the I/O address you're using, or assign these when
- loading by:
- insmod de4x5 io=0xghh where g = bus number
- hh = device number
- NB: autoprobing for modules is now supported by default. You may just
- use:
- insmod de4x5
- to load all available boards. For a specific board, still use
- the 'io=?' above.
- 3) compile de4x5.c, but include -DMODULE in the command line to ensure
- that the correct bits are compiled (see end of source code).
- 4) if you are wanting to add a new card, goto 5. Otherwise, recompile a
- kernel with the de4x5 configuration turned off and reboot.
- 5) insmod de4x5 [io=0xghh]
- 6) run the net startup bits for your new eth?? interface(s) manually
- (usually /etc/rc.inet[12] at boot time).
- 7) enjoy!
- To unload a module, turn off the associated interface(s)
- 'ifconfig eth?? down' then 'rmmod de4x5'.
- Automedia detection is included so that in principle you can disconnect
- from, e.g. TP, reconnect to BNC and things will still work (after a
- pause whilst the driver figures out where its media went). My tests
- using ping showed that it appears to work....
- By default, the driver will now autodetect any DECchip based card.
- Should you have a need to restrict the driver to DIGITAL only cards, you
- can compile with a DEC_ONLY define, or if loading as a module, use the
- 'dec_only=1' parameter.
- I've changed the timing routines to use the kernel timer and scheduling
- functions so that the hangs and other assorted problems that occurred
- while autosensing the media should be gone. A bonus for the DC21040
- auto media sense algorithm is that it can now use one that is more in
- line with the rest (the DC21040 chip doesn't have a hardware timer).
- The downside is the 1 'jiffies' (10ms) resolution.
- IEEE 802.3u MII interface code has been added in anticipation that some
- products may use it in the future.
- The SMC9332 card has a non-compliant SROM which needs fixing - I have
- patched this driver to detect it because the SROM format used complies
- to a previous DEC-STD format.
- I have removed the buffer copies needed for receive on Intels. I cannot
- remove them for Alphas since the Tulip hardware only does longword
- aligned DMA transfers and the Alphas get alignment traps with non
- longword aligned data copies (which makes them really slow). No comment.
- I have added SROM decoding routines to make this driver work with any
- card that supports the Digital Semiconductor SROM spec. This will help
- all cards running the dc2114x series chips in particular. Cards using
- the dc2104x chips should run correctly with the basic driver. I'm in
- debt to <mjacob@feral.com> for the testing and feedback that helped get
- this feature working. So far we have tested KINGSTON, SMC8432, SMC9332
- (with the latest SROM complying with the SROM spec V3: their first was
- broken), ZNYX342 and LinkSys. ZNYX314 (dual 21041 MAC) and ZNYX 315
- (quad 21041 MAC) cards also appear to work despite their incorrectly
- wired IRQs.
- I have added a temporary fix for interrupt problems when some SCSI cards
- share the same interrupt as the DECchip based cards. The problem occurs
- because the SCSI card wants to grab the interrupt as a fast interrupt
- (runs the service routine with interrupts turned off) vs. this card
- which really needs to run the service routine with interrupts turned on.
- This driver will now add the interrupt service routine as a fast
- interrupt if it is bounced from the slow interrupt. THIS IS NOT A
- RECOMMENDED WAY TO RUN THE DRIVER and has been done for a limited time
- until people sort out their compatibility issues and the kernel
- interrupt service code is fixed. YOU SHOULD SEPARATE OUT THE FAST
- INTERRUPT CARDS FROM THE SLOW INTERRUPT CARDS to ensure that they do not
- run on the same interrupt. PCMCIA/CardBus is another can of worms...
- Finally, I think I have really fixed the module loading problem with
- more than one DECchip based card. As a side effect, I don't mess with
- the device structure any more which means that if more than 1 card in
- 2.0.x is installed (4 in 2.1.x), the user will have to edit
- linux/drivers/net/Space.c to make room for them. Hence, module loading
- is the preferred way to use this driver, since it doesn't have this
- limitation.
- Where SROM media detection is used and full duplex is specified in the
- SROM, the feature is ignored unless lp->params.fdx is set at compile
- time OR during a module load (insmod de4x5 args='eth??:fdx' [see
- below]). This is because there is no way to automatically detect full
- duplex links except through autonegotiation. When I include the
- autonegotiation feature in the SROM autoconf code, this detection will
- occur automatically for that case.
- Command line arguments are now allowed, similar to passing arguments
- through LILO. This will allow a per adapter board set up of full duplex
- and media. The only lexical constraints are: the board name (dev->name)
- appears in the list before its parameters. The list of parameters ends
- either at the end of the parameter list or with another board name. The
- following parameters are allowed:
- fdx for full duplex
- autosense to set the media/speed; with the following
- sub-parameters:
- TP, TP_NW, BNC, AUI, BNC_AUI, 100Mb, 10Mb, AUTO
- Case sensitivity is important for the sub-parameters. They *must* be
- upper case. Examples:
- insmod de4x5 args='eth1:fdx autosense=BNC eth0:autosense=100Mb'.
- For a compiled in driver, in linux/drivers/net/CONFIG, place e.g.
- DE4X5_OPTS = -DDE4X5_PARM='"eth0:fdx autosense=AUI eth2:autosense=TP"'
- Yes, I know full duplex isn't permissible on BNC or AUI; they're just
- examples. By default, full duplex is turned off and AUTO is the default
- autosense setting. In reality, I expect only the full duplex option to
- be used. Note the use of single quotes in the two examples above and the
- lack of commas to separate items.
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