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List:       linux-wlan-user
Subject:    [lwlan-devel]: LWLAN AP RAM size?
From:       linux-wlan-devel () absoval ! com (David Pointer)
Date:       2000-01-26 21:19:02
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Duh. You're right. In an AP, the RAM size is proportional to the
number of users that need to be supported relative to the desired AP
performance. The RAM used by the MAC processor firmware is likely
small. Still, it's good to know what Mark's working with for the Linux
WLAN AP driver.

Thanks!

Sorry, Mark, I've ranged a bit far afield. The only relevant bit is
that I'll pass you the flashless Prism II driver diffs if/when I get
it working. And thanks for the suggestion to beat up on the Intersil
guys. The centapps@intersil.com people are quite good, ime.

*dave

On Wed, 26 Jan 2000 12:33:07 -0800, lefko@amer.net (Marty Lefkowitz)
wrote:

>I think this actually depends upon the application.  If your in an 
>environment where powersave is of concern and high a broadcast, or in the 
>situation where you need to support a large number of users per AP you may 
>need more memory.  The Baystack AP uses 256K words.  I think this is the 
>smallest.
>
>Marty
>
>
>
>At 07:30 PM 1/26/00 +0000, you wrote:
>>Thank you for the info! And thanks for the warning....
>>
>>I'm going to assume 128K words. That's cheap enough. And I'll make
>>sure that the board has etch for the next size up RAM device, too,
>>just in case.
>>
>>On the flashless side of things, it seems from the HFA3841 datasheet
>>that a 10K resistor to 3.3v is needed on MD[11]. This apparently stops
>>the flash to RAM power-on transfer dead and allows the external
>>software (i.e., the Linux WLAN code] to issue a command to start
>>downloading firmware from the MD[15:0] bus. Or so it would appear. So,
>>yes, if it works, I'll be sending you the diffs to the wlan driver to
>>support this. If it does not work, I think maybe I'll use that spot
>>I'm putting on the board for a flash device. Just in case, you know.
>>
>>*dave
>>
>>
>>On Wed, 26 Jan 2000 12:14:53 -0500 (EST), you wrote:
>>
>> >
>> >All the firmware development is being done against the reference design
>> >which I believe has 128K (words or bytes...I can't remember).
>> >
>> >One note.  All development is being done w/ systems that include flash.
>> >Going without it might be more trouble than it's worth.  One thing you'll
>> >definitely need (if you go flashless) is some kind of signal (and
>> >circuitry) to enable/disable genesis mode.
>> >
>> >-Mark
>> >
>> >On Wed, 26 Jan 2000, David Pointer wrote:
>> >
>> >> Do you have any feel yet for the max amount of HFA3841 RAM needed by
>> >> the Linux wireless LAN access point application?
>> >>
>> >> I am already leaving off the flash and loading the MAC firmware every
>> >> power-on in order to save $. I'd like to have as little RAM as
>> >> possible out there, too. The docs are not helpful as they note that an
>> >> AP application could use the whole 4M address space. Yeow.
>> >>
>> >> Thank you,
>> >>
>> >> *dave
>> >> --
>> >> David Pointer  dpointer@ucworks.com
>> >> Urbana Computer Works  Champaign, Illinois USA
>> >> http://www.ucworks.com
>> >>
>> >> --------------------------------------------------
>> >> Linux WLAN Developer's List
>> >> For more information about this list see:
>> >> http://www.absoval.com/linux-wlan/lists.html
>> >>
>> >
>> >
>> >Mark S. Mathews
>> >
>> >AbsoluteValue Software     Web:    http://www.absoval.com
>> >P.O. Box 941149            e-mail: mark@absoval.com
>> >Maitland, FL 32794-1149    Phone:  407.644.8582
>> >USA                        Fax:    407.539.1294
>>
>>*dave
>>--
>>David Pointer  dpointer@ucworks.com
>>Urbana Computer Works  Champaign, Illinois USA
>>http://www.ucworks.com
>>
>>--------------------------------------------------
>>Linux WLAN Developer's List
>>For more information about this list see:
>>http://www.absoval.com/linux-wlan/lists.html
>
>--------------------------------------------------
>Linux WLAN Developer's List
>For more information about this list see:
>http://www.absoval.com/linux-wlan/lists.html

*dave
--
David Pointer  dpointer@ucworks.com
Urbana Computer Works  Champaign, Illinois USA
http://www.ucworks.com

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