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RE: Intel StrataFlash support



Yes, that is what Intel will definitely tell you is The Way.  Conveniently,
it results in the sale of more flash.  Flash on the 261 and 262 is not
essentially free, regardless of what Intel would have you believe.  If it
weren't there, they wouldn't need the chip-scale package, and the processor
itself would be cheaper alone.  So, the fact that they've priced it
aggressively doesn't make it any more free than Internet Explorer ever was.

This issue has been discussed quite often here.  Most recently I started a
thread about this on the Linux-MTD mailing list which had some great
conversation about the tradeoffs.  I recommend you check out the linux-mtd
mailing list archives:

http://lists.infradead.org/pipermail/linux-mtd/2002-December/006632.html

-Paul

-----Original Message-----
From: Liam Breck [mailto:liam@xxxxxxx.org] 
Sent: Wednesday, January 01, 2003 12:19 PM
To: jffs-dev@xxxxxxx.com
Subject: Re: Intel StrataFlash support


Thanks for the MTD list links; I hadn't searched for "Strata Flash". Clearly
basic StrataFlash support exists, but there's more to do...

What I was driving at is that the "flash is more expensive than RAM"
argument against XIP has just gone out the window in some important cases.

On the PXA262 & 261, flash is essentially free - up to 256Mb! And for
reading, this flash performs like RAM.

In this setting, RAM is not only more expensive, it can be a power drain as
well.

I feel this setting calls for XIP and writable/compressed segments on the
same chip, with whole-chip wear-leveling. (I'd guess by dividing the chip
into romfs and jffs2 partitions, and continually trading blocks between
them...)


Liam Breck, Director
PointServers.org                                  liam@xxxxxxx.org
Boston, Massachusetts                           http://pointservers.org/


At 02:23 PM 1/1/03 +0100, tglx@xxxxxxx.de wrote:
>On Tuesday 31 December 2002 21:59, Liam Breck wrote:
>> I'm wondering what support exists in JFFS2 and/or MTD for Intel 
>> StrataFlash. This type of flash includes a RAM bit for each flash bit 
>> in the device, providing flash reads at RAM speeds.
>http://www.google.com/search?q=site:lists.infradead.org+strata
>
>> This technology also re-raises the XIP issue. Parts of this flash 
>> should be treated as uncompressed ROM for XIP, but *which* parts 
>> would need to shift over time in order to do wear-leveling over the 
>> whole device.
>http://www.google.com/search?q=site:lists.infradead.org+xip
>http://www.google.com/search?q=site:lists.arm.linux.org.uk+xip
>
>> Intel StrataFlash is likely to become a common component in embedded
>Really ? http://www.intel.com/pressroom/archive/releases/flo91797.htm
>
>> systems, as it is part of the XScale PXA26x CPUs (and they have 
>> recently discontinued the PXA250, which lacked it).
>
>> Thoughts?
>Yes. Happy New Year !
>
>--
>Thomas
>____________________________________________________
>linutronix - competence in embedded & realtime linux
>http://www.linutronix.de
>mail: tglx@xxxxxxx.de


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