From: Marek Vasut <marex@denx.de>
To: Michal Suchanek <hramrach@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
zajec5@gmail.com, Alison Chaiken <alison_chaiken@mentor.com>,
Ben Hutchings <ben@decadent.org.uk>,
Geert Uytterhoeven <geert+renesas@glider.be>,
"Bean Huo \(beanhuo\)" <beanhuo@micron.com>,
"grmoore@altera.com" <grmoore@altera.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/3] MTD: spi-nor: add flag to not use sector erase.
Date: Fri, 1 May 2015 01:13:50 +0200 [thread overview]
Message-ID: <201505010113.50293.marex@denx.de> (raw)
In-Reply-To: <35add8df33b17e2354d9496eba8597d9d8488f30.1430430153.git.hramrach@gmail.com>
On Thursday, April 30, 2015 at 11:13:12 PM, Michal Suchanek wrote:
> The sector size of the flash memory is unclear from datasheet or may
> possibly vary between chips so add a flag to always use 4k blocks.
>
> Currently 4k blocks are always used when possible but in the future
> somebody might want to do some optimizations with sector erase.
>
> Signed-off-by: Michal Suchanek <hramrach@gmail.com>
I _think_ you might be able to determine the size, no ?
One way is to ask the vendor, but you can also try something like:
1) erase the whole SPI NOR
2) overwrite it with zeroes (or ones ? I think it should be all ones after
erasing).
3) Erase sector 0
4) Read some 128 KiB back
5) Observe what is the difference.
Best regards,
Marek Vasut
next parent reply other threads:[~2015-04-30 23:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1430430153.git.hramrach@gmail.com>
[not found] ` <35add8df33b17e2354d9496eba8597d9d8488f30.1430430153.git.hramrach@gmail.com>
2015-04-30 23:13 ` Marek Vasut [this message]
2015-05-01 7:05 ` [PATCH 3/3] MTD: spi-nor: add flag to not use sector erase Michal Suchanek
2015-05-01 10:50 ` Jonas Gorski
2015-05-01 14:20 ` Marek Vasut
2015-05-04 11:11 ` Michal Suchanek
2015-05-04 12:12 ` Marek Vasut
2015-05-04 13:18 ` Michal Suchanek
2015-05-04 13:35 ` Marek Vasut
2015-05-04 13:39 ` Michal Suchanek
2015-05-04 14:11 ` Marek Vasut
2015-05-01 21:56 ` Rafał Miłecki
[not found] ` <02f7510acb9b6dbb3a5a6cd5bb287762eb4d22c1.1430430153.git.hramrach@gmail.com>
2015-04-30 23:09 ` [PATCH 1/3] MTD: m25p80: fix write return value Marek Vasut
2015-05-20 23:45 ` Brian Norris
2015-05-21 8:33 ` Michal Suchanek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=201505010113.50293.marex@denx.de \
--to=marex@denx.de \
--cc=alison_chaiken@mentor.com \
--cc=beanhuo@micron.com \
--cc=ben@decadent.org.uk \
--cc=computersforpeace@gmail.com \
--cc=dwmw2@infradead.org \
--cc=geert+renesas@glider.be \
--cc=grmoore@altera.com \
--cc=hramrach@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=zajec5@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).