(Fwd) Re: DOSFS bug fixes, IDE drivers and sample released

[Angelo Fraietta]

I have had a look at the sample and am building it now.
Will there be an option to unmount? I only want the drive mounted for 
the period that reading or writing will take place as this is a musical 
instrument and I want people to just pull the power off when they are 
finished without having to deinitialise the system -- i.e. unmount drives.

Thomas Doerfler wrote:

>Hello Angelo,
>
>the "sample" program is located in the patch filed in the gnat 
>system as PR369. So if you go to 
>
>http://www.oarcorp.com/cgi-bin/gnatsweb.pl
>
>and inspect PR369 and download/apply the patch and then look 
>into c/src/tests/samples/fileio, you will see the sample 
>application.
>
>BTW, you will also need PR368 and PR367 to get everything 
>running (these PRs contain modifications for the DOSFS code 
>and added drivers for PC386 and MBX8xx).
>
>wkr,
>	Thomas.
>
>
>>Where are the samples for these? I want to test this out for pc386. Does 
>>it support pc386 yet?
>>
>>Eugeny S. Mints wrote:
>>
>>>On Mon, 3 Mar 2003, Thomas Doerfler wrote:
>>>
>>>>------- Forwarded message follows -------
>>>>From:           	"Thomas Doerfler" <Thomas.Doerfler at imd-systems.de>
>>>>Organization:   	IMD
>>>>To:             	Chris Caudle <chris at chriscaudle.org>
>>>>Date sent:      	Mon, 03 Mar 2003 09:01:38 +0100
>>>>Subject:        	Re: DOSFS bug fixes, IDE drivers and sample released
>>>>Copies to:      	Thomas Doerfler <Thomas.Doerfler at imd-systems.de>
>>>>Priority:       	normal
>>>>
>>>>
>>>>
>>>>>On Sunday 02 March 2003 9:48 am, Joel Sherrill wrote:
>>>>>
>>>>>>>filed as PR 367/368/369 in the GNATS system, see:
>>>>>>>
>>>>>Does the driver filed in PR 368 support DMA transfer yet, or programmed I/O
>>>>>only?
>>>>>
>>>>It is really a minimal implementation, supporting PIO mode.
>>>>Actually I am not so aware about various IDE transfer modes,
>>>>the integration of DMA into the PC architecture an so on, my
>>>>goal was to implement at least basic harddisc support.
>>>>
>>>Actually the answer is the following: DMA and POI modes are
>>>entities which belong to generic high level ATA driver
>>>implemented in ata.c file. In other words wether the data
>>>will be transferred in PIO or DMA mode depends on ATA
>>>commands issued. In general, low level IDE drivers (as
>>>Thomas drivers written for i386 and mbx8xx) just "pass" ATA commands to an
>>>IDE chip just by providing ability for writing any data to a
>>>chip registers. In addition to the basic
>>>functionality described above, current IDE drivers have
>>>several routines for optimization of data read/write in PIO
>>>mode (*_ide_read_block/*pc386_ide_write_block).
>>>
>>>So, any low level IDE driver has ability to support PIO and
>>>DMA modes by definition (but of course current low IDE
>>>drivers may need some update for DMA support) and the issue
>>>depends on generic ATA driver implementaion. Unfortunately, current ATA
>>>driver implementation supports only PIO mode, but from the
>>>beggining was designed to allow easy extension (I
>>>mean addition of new ATA commands). So, generic ATA driver
>>>should be modified for DMA mode support.
>>>
>>>>So here is a lot of space to improve things :-)
>>>>
>>>Agree:)))
>>>
>>>Hope, this helps,
>>>                       Eugeny
>>>
>>>
>>-- 
>>Angelo Fraietta
>>
>>PO Box 859
>>Hamilton NSW 2303
>>
>>Home Page
>>
>>
>>http://www.users.bigpond.com/angelo_f/
>>
>>There are those who seek knowledge for the sake of knowledge - that is CURIOSITY
>>There are those who seek knowledge to be known by others - that is VANITY
>>There are those who seek knowledge in order to serve - that is LOVE
>>    Bernard of Clairvaux (1090 - 1153)
>>
>>
>>
>
>--------------------------------------------
>IMD Ingenieurbuero fuer Microcomputertechnik
>Thomas Doerfler           Herbststrasse 8
>D-82178 Puchheim          Germany
>email:    Thomas.Doerfler at imd-systems.de
>PGP public key available at: http://www.imd-
>systems.de/pgp_keys.htm
>
>

-- 
Angelo Fraietta

PO Box 859
Hamilton NSW 2303

Home Page


http://www.users.bigpond.com/angelo_f/

There are those who seek knowledge for the sake of knowledge - that is CURIOSITY
There are those who seek knowledge to be known by others - that is VANITY
There are those who seek knowledge in order to serve - that is LOVE
    Bernard of Clairvaux (1090 - 1153)


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