From: Scott Wood <scottwood@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] flash post test
Date: Mon, 6 Feb 2012 16:55:22 -0600 [thread overview]
Message-ID: <4F305A5A.80607@freescale.com> (raw)
In-Reply-To: <4F3052FC.4050200@aribaud.net>
On 02/06/2012 04:23 PM, Albert ARIBAUD wrote:
> Hi Vaibhav,
>
> Le 06/02/2012 05:57, vaibhav kothari a ?crit :
>> hi albert
>>
>> Yes,actually there is already support of flash test in POST of latest
>> uboot.They are testing flash on every power on so am I for my board.But i
>> don't want to disturb sectors in which uboot code relies. Can you help me
>> here?
>
> I am no NAND specialist, but I do hope NAND POST tests are pure read
> tests and thus are not affected by poweroffs (and can actually test any
> part of NAND).
NAND has a property called "read disturb", where excessively reading a
sector without writing to it can eventually cause data loss. U-Boot is
already read once per boot, but reading it a second time could halve the
expected lifetime. Data managed by something like ubi is be scrubbed in
a way that avoids this, but U-Boot itself is not usually managed in this
way (boot hardware/rom does not understand ubi).
-Scott
next prev parent reply other threads:[~2012-02-06 22:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-31 9:27 [U-Boot] flash post test vk
2012-02-03 21:32 ` Albert ARIBAUD
2012-02-06 4:57 ` vaibhav kothari
2012-02-06 22:23 ` Albert ARIBAUD
2012-02-06 22:55 ` Scott Wood [this message]
2012-02-06 22:59 ` Albert ARIBAUD
2012-02-06 23:02 ` Scott Wood
2012-02-07 4:32 ` vaibhav kothari
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