From: Ilya Yanok <yanok@emcraft.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] Request for Help: How to save data to an SD/MMC card
Date: Wed, 14 Dec 2011 03:46:57 +0400 [thread overview]
Message-ID: <4EE7E3F1.6030905@emcraft.com> (raw)
In-Reply-To: <CALButCLyUu1gWT_n3=Jx+g0x1=7fO=o6wrYrnN-LYksXcX7LwA@mail.gmail.com>
Hi Graeme,
On 14.12.2011 03:37, Graeme Russ wrote:
>> Well, it shouldn't be that hard to get the data written to specific
>> blocks on the dev PC using dd command.
>
> But what about bad blocks?
You don't need to worry much about this. MMC/SD card are not a raw flash
devices they contain FTL that handles this internally. See
http://www.linux-mtd.infradead.org/doc/ubifs.html#L_raw_vs_ftl
for details.
That's why you can use generic filesystems on MMC/SD (neither FAT not
EXT2/3/4 is not designed for raw flash).
Regards, Ilya.
next prev parent reply other threads:[~2011-12-13 23:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-13 5:16 [U-Boot] Request for Help: How to save data to an SD/MMC card Graeme Russ
2011-12-13 8:14 ` Wolfgang Denk
2011-12-13 23:18 ` Graeme Russ
2011-12-13 23:26 ` Ilya Yanok
2011-12-13 23:28 ` Graeme Russ
2011-12-13 23:31 ` Ulf Samuelsson
2011-12-13 23:34 ` Ilya Yanok
2011-12-13 23:37 ` Graeme Russ
2011-12-13 23:46 ` Ilya Yanok [this message]
2011-12-13 23:52 ` Graeme Russ
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