Subject:
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Re: Flash Write Cycles
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Wed, 13 Sep 2006 16:43:45 GMT
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Viewed:
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13902 times
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In lugnet.robotics.nxt, David Wallace wrote:
> > According to what I have read, putting the AT91SAM7S processor in system
> > recovery mode (i.e., by resetting it via the hardware reset button or by
> > programmatically putting it into firmware boot mode) loads SAM-BA into
> flash
>
> Are you sure of this John? It seems like the reset button would be for dire
> circumstances and would do something different than the firmware boot mode.
I am not 100% sure but I am pretty sure based on a number of discussions that I
have been involved with during the MUP2/MDP. To the best of my knowledge a
clicking brick (however it got into that state) is a brick running SAM-BA in
flash with the first two pages locked.
> > But I have heard from a very reliable source that ATMEL has measured lock bit
> > read/write cycles at up to 7500 under normal temperature conditions
>
> If this is true, I vote we all shut up - or maybe I should just shut up :-)
Last night I used a new version of NeXTTool (with an undocumented command-line
switch) to cycle the firmware 110 times on my oldest brick which has already
been cycled a bunch of times. It still works. I don't recommend you try it
yourself. It takes about 30 seconds per cycle so running it through 7500 cycles
will take a while.
John Hansen
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Message is in Reply To:
 | | Re: Flash Write Cycles
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| (...) flash Are you sure of this John? It seems like the reset button would be for dire circumstances and would do something different than the firmware boot mode. The spec says this about SAMBA loading: "To enter SAM-BA Boot Recovery, the TST pin (...) (18 years ago, 13-Sep-06, to lugnet.robotics.nxt)
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