On Monday 04 June 2012, David Brown wrote:
> On Mon, Jun 04, 2012 at 03:36:55PM +0000, Arnd Bergmann wrote:
>
> > I can always need more samples. If anyone has Samsung cards at hand, could
> > you
> > send the output of "tail -n 100 /sys/block/mmcblk0/device/*
> > /proc/partitions"?
>
> I'm not exactly sure what these are. It says "Samsung 16GB Class 10,
> and the back says
>
> MMBTR16GUBCA-ME
> | CYJ485GA 144
> Made in TAIWAN
>
> but I might have an error there (it is tiny).
Hmm, it had not occurred to me to compare the numbers on the card, rather than
those
on the packaging ;-)
Now my excellent "Essential" (blue label) 32 GB class 10 card looks like this
MMBTR32GUBCA-AB
S 32GBUSD1 132
Made in Korea
while my bad "Essential" 8GB looks the same from the front with the blue label,
but
has more text on it:
MB-MS8GA
MBMS8GVCDBCA-RF
ICY11447QZ142
MADE IN TAIWAN
DESIGNED BY
SAMSUNG
So it seems that the text on your card is a mix of the one one my two cards.
> ==> date <==
> 11/2011
>
> ==> driver <==
>
> ==> erase_size <==
> 512
>
> ==> fwrev <==
> 0x0
>
> ==> hwrev <==
> 0x1
>
> ==> manfid <==
> 0x00001b
>
> ==> name <==
> 00000
>
> ==> oemid <==
> 0x534d
All of these seem to be the same for all the cards I have, which means
that we cannot rely on the fwrev and hwrev fields.
> 179 96 15632384 mmcblk1
> 179 97 14680064 mmcblk1p1
> 179 98 951279 mmcblk1p2
15632384 KB is a multiple of 2MB, but no larger power-of-two size,
which suggests that this is the erase block size. However, most
devices nowdays use larger erase blocks than that. My 32GB card also
a size that is a multiple of no more than 1MB.
The 8GB card uses a multiple of both 4 MB and 6 MB, and it uses a
6 MB erase block size.
If you don't need the data on your card, could you run these
commands on yours:
for i in 2 3 30 31 ; do
sudo flashbench --open-au --open-au-nr=30 --erasesize=$[512 * 1024] \
/dev/mmcblk0 --offset=$[24*1024*1024]
done
The latest version of the code is at
git://git.linaro.org/people/arnd/flashbench.git
Running the code will mess up the data but should not harm the device,
but I recommend to run the 'erase' command from the flashbench repository
on the entire card afterwards to get back the full performance.
Arnd
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