Re: [uCsimm] ucLinux Compact Flash Adapter

From: Glenn West (gwest@krdl.org.sg)
Date: Sun Oct 08 2000 - 21:24:09 EDT


Want to leave pins free for other functions
is the bigest reason. It should not
be to bad. Actually in the schematic
I've allowed talking to the card in
both memory mapped or True IDE.
Thought it would be useful if someone
came out with a "802.11" or other special
purpose card.

At 11:08 PM 10/6/2000, you wrote:
>Glenn,
>
> Seems like we both need the same thing, a working CF drive system. I
>am curious as to why you are going with the True IDE mode as opposed to
>the Memory Mapped mode of the CF? Have you looked into the IDE drive
>code under uClinux, how big a job will it be to rewrite the ide.c stuff?
>
>
> I am planning on using it in a parallel mode of access on a new
>design. Maybe we can compare notes / break the workload up?
>
>TomW
>
>
>
>
>
>
>Glenn West wrote:
> >
> > Thanks John.
> >
> > The WP I'll add a pin for that.
> > Also a switch. That way you can use a local switch, or build
> > it somewhere else if you want.
> >
> > File system will be the standard DOS one.
> > Since I'm doing a block device driver, and debugging
> > the "indian"ness of the DOS FS. Have to look
> > at the journalling as a second step.
> >
> > Of course, if you write your file first under a temp name, then
> > rename it, you can reduce the window.
> >
> > The writing will be direct, no cache. (Well the drives sometimes
> > have cache, but that is controlled by drive options/jumpers for IDE)
> >
> > At 05:40 PM 9/22/2000, you wrote:
> > >Hi Glenn,
> > >
> > >Glenn West wrote:
> > >
> > > > Hi All
> > > >
> > > > In the process of doing a CF/IDE adapter.
> > > >
> > > > Followng is the specs:
> > > >
> > > > Same formfactor as ucsimm (Taller to accomadate the CF Plug)
> > > > Use SPI interface to 68EZ/VZ
> > > > Allow up to 4 SIMM per SPI/ucsimm (4 CF or 4 IDE interfaces - Mix
> or match)
> > > > 1 Type2 Compact Flash Socket
> > > > 1 IDE 40/44 Pin Connector
> > > >
> > > > I'll get the DOS FS up and running as well.
> > >
> > > > Any special requests?
> > >
> > >So, you are going to use the CF in true-ide mode.
> > >In that case, a hardware (no, not software, since that can always be
> > >hacked into)
> > >write protect switch/jumper would be very handy to protect data or
> > >boot image/filesystem. The filesystem should become hacker-proof that way.
> > >
> > >Secondly, are you going to do direct writing or use a cache ?
> > >Take into account power losses or deliberate power-down can cause
> > >filesystem corruption.
> > >How about Axis' (if I recall correctly) Journalling Flash file system ?
> > >
> > > > The IC for doing the interfacing can also be available.
> > > >
> > > > This message resent by the ucsimm@uclinux.com list server
> > > http://www.uClinux.com/
> > >
> > >Best Regards,
> > >
> > >--
> > > Johan Severeyns
> > > R&D Engineer, Network Administrator
> > > IDCS N.V.
> > >
> > >
> > >This message resent by the ucsimm@uclinux.com list server
> > >http://www.uClinux.com/
> >
> > This message resent by the ucsimm@uclinux.com list server
> http://www.uClinux.com/
>
>--
>Tom Walsh - WN3L - Embedded Systems Consultant
>'www.openhardware.net', 'www.cyberiansoftware.com'
>"Windows? No thanks, I have work to do..."
>This message resent by the ucsimm@uclinux.com list server
>http://www.uClinux.com/

This message resent by the ucsimm@uclinux.com list server http://www.uClinux.com/



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