Re: flash

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From: Andy Green
Subject: Re: flash
Date: Tuesday, July 8, 2008 - 7:58 am

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Somebody in the thread at some point said:

| Jffs2 is just a symptom of writing direct to raw NAND...  we don't need
| to deal with these unusual formats when our storage is SD Card.  In that
| future, we use the very well characterized ext2 or ext3.
|
|> but that doesn't help- as such we have our OS on "on-chip" flash.
that's where
|> it is. it's nastily slow (2mb/sec read rates is what i clocked on the
mtdblock
|> devices themselves, so bypassing jffs2 overhead). am i wrong i
suspecting our
|> flash SHOULD be much faster? (like 5-10x faster)? this is for freerunner.
|> future devices is... another matter :)

Well we can boot SD on GTA02.  But I really mean it's not obvious we
should make a big investment into a new raw mtd filesystem given where
we are headed.

Practically, there's likely something wrong with how we use jffs2 from
cradle to grave and we probably get a better result looking at that.

- -Andy
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Messages in current thread:
Current Bootchart, Fred Chien, (Sat Jul 5, 2:17 pm)
Re: Current Bootchart, Fred Chien, (Sat Jul 5, 4:38 pm)
Re: Current Bootchart, Werner Almesberger, (Sat Jul 5, 5:05 pm)
Re: Current Bootchart, Marek Lindner, (Sat Jul 5, 8:30 pm)
Re: Current Bootchart, Sander van Grieken, (Sun Jul 6, 1:07 am)
Re: Current Bootchart, Ross Burton, (Sun Jul 6, 2:08 am)
Re: Current Bootchart, Fred Chien, (Sun Jul 6, 2:10 am)
Re: Current Bootchart, Andy Green, (Sun Jul 6, 2:29 am)
Re: Current Bootchart, Alexey Feldgendler, (Mon Jul 7, 2:36 am)
Re: Current Bootchart, Graeme Gregory, (Mon Jul 7, 2:48 am)
Re: Current Bootchart, Dr. H. Nikolaus Schaller, (Mon Jul 7, 2:59 am)
Re: Current Bootchart, Graeme Gregory, (Mon Jul 7, 3:04 am)
Re: Current Bootchart, Dr. H. Nikolaus Schaller, (Mon Jul 7, 3:06 am)
Re: Current Bootchart, Wolfgang Spraul, (Mon Jul 7, 6:59 am)
Re: Current Bootchart, Graeme Gregory, (Mon Jul 7, 7:39 am)
Re: Current Bootchart, Wolfgang Spraul, (Mon Jul 7, 8:20 am)
Re: Current Bootchart, Carsten Haitzler, (Tue Jul 8, 3:42 am)
Re: Current Bootchart, Carsten Haitzler, (Tue Jul 8, 3:43 am)
Re: Current Bootchart, Carsten Haitzler, (Tue Jul 8, 3:45 am)
flash (was: Current Bootchart), Michael 'Mickey' Lauer, (Tue Jul 8, 5:35 am)
Re: flash (was: Current Bootchart), Carsten Haitzler, (Tue Jul 8, 5:53 am)
Re: flash, Andy Green, (Tue Jul 8, 7:03 am)
Re: flash, Michael 'Mickey' Lauer, (Tue Jul 8, 7:11 am)
Re: flash, Andy Green, (Tue Jul 8, 7:18 am)
Re: flash, Michael 'Mickey' Lauer, (Tue Jul 8, 7:27 am)
Re: flash, Werner Almesberger, (Tue Jul 8, 7:42 am)
Re: flash, Andy Green, (Tue Jul 8, 7:45 am)
Re: flash, Carsten Haitzler, (Tue Jul 8, 7:49 am)
Re: flash, Andy Green, (Tue Jul 8, 7:58 am)
Re: flash, Werner Almesberger, (Tue Jul 8, 8:03 am)
Re: flash, Carsten Haitzler, (Tue Jul 8, 8:12 am)
RE: flash, Crane, Matthew, (Tue Jul 8, 8:20 am)
Re: flash, Jay Vaughan, (Tue Jul 8, 9:39 am)
Re: Current Bootchart, Fred Chien, (Tue Jul 8, 9:40 am)
Re: Current Bootchart, Andy Green, (Tue Jul 8, 9:49 am)
Re: Current Bootchart, Marek Lindner, (Tue Jul 8, 9:59 am)
Re: Current Bootchart, Andy Green, (Tue Jul 8, 10:05 am)
Re: Current Bootchart, Marek Lindner, (Tue Jul 8, 10:19 am)
Re: Current Bootchart, Carsten Haitzler, (Tue Jul 8, 10:38 am)
Re: Current Bootchart, Andy Green, (Tue Jul 8, 10:42 am)
Re: Current Bootchart / breaking SD boot, Andy Green, (Tue Jul 8, 10:45 am)
Re: Current Bootchart / breaking SD boot, Carsten Haitzler, (Tue Jul 8, 11:35 am)
Re: Current Bootchart / breaking SD boot, Werner Almesberger, (Tue Jul 8, 2:44 pm)
Re: Current Bootchart / breaking SD boot, Carsten Haitzler, (Tue Jul 8, 3:13 pm)
Re: flash, matt_hsu, (Tue Jul 8, 7:29 pm)
Re: flash, Werner Almesberger, (Tue Jul 8, 7:59 pm)
Re: Current Bootchart / breaking SD boot, Andy Green, (Tue Jul 8, 11:54 pm)
Re: Current Bootchart / breaking SD boot, Carsten Haitzler, (Wed Jul 9, 3:58 am)
Re: Current Bootchart / breaking SD boot, Sander van Grieken, (Wed Jul 9, 12:04 pm)
Re: Current Bootchart / breaking SD boot, Carsten Haitzler, (Wed Jul 9, 1:16 pm)
Re: Current Bootchart / breaking SD boot, Mike (mwester), (Wed Jul 9, 1:47 pm)
Re: Current Bootchart / breaking SD boot, Marcelo, (Wed Jul 9, 3:12 pm)
Re: Current Bootchart / breaking SD boot, Marcelo, (Wed Jul 9, 3:21 pm)
Re: Current Bootchart / breaking SD boot, Thomas Gstädtner, (Wed Jul 9, 3:35 pm)
Re: Current Bootchart / breaking SD boot, Mike (mwester), (Wed Jul 9, 4:15 pm)
Re: Current Bootchart / breaking SD boot, Michael 'Mickey' Lauer, (Wed Jul 9, 4:16 pm)
Re: Current Bootchart / breaking SD boot, Werner Almesberger, (Wed Jul 9, 4:40 pm)
Re: Current Bootchart / breaking SD boot, Mike (mwester), (Wed Jul 9, 4:45 pm)
Re: Current Bootchart / breaking SD boot, Joe Pfeiffer, (Wed Jul 9, 4:47 pm)
Re: Current Bootchart / breaking SD boot, Werner Almesberger, (Wed Jul 9, 5:15 pm)
Re: Current Bootchart / breaking SD boot, Joerg Reisenweber, (Wed Jul 9, 5:23 pm)
Re: Current Bootchart / breaking SD boot, Joe Pfeiffer, (Wed Jul 9, 5:29 pm)
Re: Current Bootchart / breaking SD boot, Werner Almesberger, (Wed Jul 9, 5:44 pm)
Re: Current Bootchart / breaking SD boot, Mike (mwester), (Wed Jul 9, 6:46 pm)
Re: Current Bootchart / breaking SD boot, Andy Green, (Fri Jul 11, 2:54 am)
Re: Current Bootchart / GSM power, Andy Green, (Fri Jul 11, 3:02 am)
Re: Current Bootchart / GSM power, Werner Almesberger, (Fri Jul 11, 5:52 am)
Re: Current Bootchart / breaking SD boot, M. Dietrich, (Sat Jul 12, 2:09 pm)
Re: Current Bootchart, Marcin Juszkiewicz, (Mon Jul 14, 3:56 am)
Re: Current Bootchart, Troy Benjegerdes, (Mon Jul 14, 1:21 pm)
Re: Current Bootchart, Marek Lindner, (Mon Jul 14, 8:38 pm)