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Message-ID: <5554FF76.2010206@lwfinger.net>
Date: Thu, 14 May 2015 15:03:02 -0500
From: Larry Finger <Larry.Finger@...inger.net>
To: "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
CC: Benny Silberstein <bennys@...chmarkmerchantsolutions.com>,
"peretz@...chmarkmerchantsolutions.com >> Peretz Mockin"
<peretz@...chmarkmerchantsolutions.com>
Subject: Help with writing to micro SD card
I am helping to get wifi and Bluetooth woring under Linux using a Winbook TW100
tablet. The main goal is working quite well; however, I am only able to run
using Live media. Whenever I try to load Linux onto either the internal SD card,
or one mounted in the external slot, the process stalls with nothing logged.
I know the external card is OK as I can read or write it when it is mounted in
my laptop.
When I received the tablet, I used dd to back up the internal card. When I used
a block size of 4M in that operation, it also froze; however, the standard block
size (512) worked. That suggests that the standard Linux r/w operations on the
device are too fast.
What should I do to get some debug information? If my idea is correct, how might
I slow down the I/O to the device?
Thanks,
Larry
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