[SOLVED] Detecting MMC Card

priyadarshan · 12-12-2010, 11:24 PM

Hi...

I am porting the kernel on my hardware board...

dmesg shows that...

mmc0: mvsdio driver initialized, lacking card detect (fall back to polling)
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address aaaa
mmcblk0: mmc0:aaaa SU08G 7.40 GiB
mmcblk0: p1

This means it has detected the card....

What I want to do is to run IO performance utility for mmc interface...

U have tools like iozone and all...

What I lack is what to mount on mnt

as there is nothing like mmc0 mmcblk0 in /dev

Can anyone pls help???

While firing fdisk -l

I am not getting an entry for MMC

markush · 12-13-2010, 12:18 AM

Hi,

I hope I've understood you question.

Did you try to mount it like a USB-drive? look at

Code:

ls /dev/sd*

for (in most cases) /dev/sdb1 or /dev/sdc1 and mount it to (as an example)

Code:

mount /dev/sdb1 /mnt

Markus

priyadarshan · 12-13-2010, 12:33 AM

Yes, this is what I tried... and I found no entry under the name mmc

ls /dev/m
mem midi2 mpu401stat mtd14 mtd7 mtdblock4
midi0 midi3 mtd0 mtd15 mtd8 mtdblock5
midi00 mixer mtd1 mtd2 mtd9 mtdblock6
midi01 mixer1 mtd10 mtd3 mtdblock0 mtdblock7
midi02 mixer2 mtd11 mtd4 mtdblock1
midi03 mixer3 mtd12 mtd5 mtdblock2
midi1 mpu401data mtd13 mtd6 mtdblock3

priyadarshan · 12-13-2010, 12:35 AM

By d way... does MMC corresponds to any /dev/sd* entry rather then mmcblk* ???

If it is so then how can I get /dev/sd number???

markush · 12-13-2010, 02:05 AM

As I wrote it should be /dev/sdb1 or /dev/sdc1 (normally). try

Code:

ls /dev/sd*

/dev/sda is your harddisk, if you have only one harddisk in you computer, the sd-card-drives are sdb1 or sdc1.

Markus

priyadarshan · 12-13-2010, 02:58 AM

But shouldnt it be shown when one fires fdisk -l???

markush · 12-13-2010, 03:00 AM

No, fdisk is only able to show the card if it has a partitiontable.

Markus

priyadarshan · 12-13-2010, 03:13 AM

-sh-3.2# ls
HDD1 HDD2 japan
-sh-3.2# mkdir SD

-sh-3.2# fdisk -l

Disk /dev/sda: 4012 MB, 4012900352 bytes
255 heads, 63 sectors/track, 487 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 1 477 3831471 83 Linux
/dev/sda2 478 487 80325 82 Linux swap

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 60801 488384001 83 Linux

-sh-3.2# mount /dev/sdc1 /mnt/SD/
mount: mounting /dev/sdc1 on /mnt/SD/ failed: No such device or address

-sh-3.2# mount /dev/sdd1 /mnt/SD/
mount: mounting /dev/sdd1 on /mnt/SD/ failed: No such device or address

-sh-3.2# mount /dev/sde1 /mnt/SD/
mount: mounting /dev/sde1 on /mnt/SD/ failed: No such device or address

-sh-3.2# mount /dev/sdf1 /mnt/SD/
mount: mounting /dev/sdf1 on /mnt/SD/ failed: No such device or address

-sh-3.2# mount /dev/sdg1 /mnt/SD/
mount: mounting /dev/sdg1 on /mnt/SD/ failed: No such device or address

-sh-3.2# mount /dev/sd1 /mnt/SD/
mount: mounting /dev/sd1 on /mnt/SD/ failed: No such file or directory

(

markush · 12-13-2010, 03:14 AM

... and what is /dev/sda on your system, a 4GB device?

Please post the output of

Code:

ls /dev/sd*

Markus

priyadarshan · 12-13-2010, 03:16 AM

Its a flash drive, from which my filesystem is loaded

priyadarshan · 12-13-2010, 03:17 AM

It really not my card... My micro mmc is of 8 GB
and dmesg also shows it as 7.40GB storage

markush · 12-13-2010, 03:17 AM

Well, please post the ouput of "ls /dev/sd*".

Markus

priyadarshan · 12-13-2010, 03:24 AM

-sh-3.2# ls /dev/sd*
/dev/sda /dev/sdc5 /dev/sdf14 /dev/sdi1 /dev/sdk6 /dev/sdn15
/dev/sda1 /dev/sdc6 /dev/sdf15 /dev/sdi10 /dev/sdk7 /dev/sdn2
/dev/sda10 /dev/sdc7 /dev/sdf2 /dev/sdi11 /dev/sdk8 /dev/sdn3
/dev/sda11 /dev/sdc8 /dev/sdf3 /dev/sdi12 /dev/sdk9 /dev/sdn4
/dev/sda12 /dev/sdc9 /dev/sdf4 /dev/sdi13 /dev/sdl /dev/sdn5
/dev/sda13 /dev/sdd /dev/sdf5 /dev/sdi14 /dev/sdl1 /dev/sdn6
/dev/sda14 /dev/sdd1 /dev/sdf6 /dev/sdi15 /dev/sdl10 /dev/sdn7
/dev/sda15 /dev/sdd10 /dev/sdf7 /dev/sdi2 /dev/sdl11 /dev/sdn8
/dev/sda2 /dev/sdd11 /dev/sdf8 /dev/sdi3 /dev/sdl12 /dev/sdn9
/dev/sda3 /dev/sdd12 /dev/sdf9 /dev/sdi4 /dev/sdl13 /dev/sdo
/dev/sda4 /dev/sdd13 /dev/sdg /dev/sdi5 /dev/sdl14 /dev/sdo1
/dev/sda5 /dev/sdd14 /dev/sdg1 /dev/sdi6 /dev/sdl15 /dev/sdo10
/dev/sda6 /dev/sdd15 /dev/sdg10 /dev/sdi7 /dev/sdl2 /dev/sdo11
/dev/sda7 /dev/sdd2 /dev/sdg11 /dev/sdi8 /dev/sdl3 /dev/sdo12
/dev/sda8 /dev/sdd3 /dev/sdg12 /dev/sdi9 /dev/sdl4 /dev/sdo13
/dev/sda9 /dev/sdd4 /dev/sdg13 /dev/sdj /dev/sdl5 /dev/sdo14
/dev/sdb /dev/sdd5 /dev/sdg14 /dev/sdj1 /dev/sdl6 /dev/sdo15
/dev/sdb1 /dev/sdd6 /dev/sdg15 /dev/sdj10 /dev/sdl7 /dev/sdo2
/dev/sdb10 /dev/sdd7 /dev/sdg2 /dev/sdj11 /dev/sdl8 /dev/sdo3
/dev/sdb11 /dev/sdd8 /dev/sdg3 /dev/sdj12 /dev/sdl9 /dev/sdo4
/dev/sdb12 /dev/sdd9 /dev/sdg4 /dev/sdj13 /dev/sdm /dev/sdo5
/dev/sdb13 /dev/sde /dev/sdg5 /dev/sdj14 /dev/sdm1 /dev/sdo6
/dev/sdb14 /dev/sde1 /dev/sdg6 /dev/sdj15 /dev/sdm10 /dev/sdo7
/dev/sdb15 /dev/sde10 /dev/sdg7 /dev/sdj2 /dev/sdm11 /dev/sdo8
/dev/sdb2 /dev/sde11 /dev/sdg8 /dev/sdj3 /dev/sdm12 /dev/sdo9
/dev/sdb3 /dev/sde12 /dev/sdg9 /dev/sdj4 /dev/sdm13 /dev/sdp
/dev/sdb4 /dev/sde13 /dev/sdh /dev/sdj5 /dev/sdm14 /dev/sdp1
/dev/sdb5 /dev/sde14 /dev/sdh1 /dev/sdj6 /dev/sdm15 /dev/sdp10
/dev/sdb6 /dev/sde15 /dev/sdh10 /dev/sdj7 /dev/sdm2 /dev/sdp11
/dev/sdb7 /dev/sde2 /dev/sdh11 /dev/sdj8 /dev/sdm3 /dev/sdp12
/dev/sdb8 /dev/sde3 /dev/sdh12 /dev/sdj9 /dev/sdm4 /dev/sdp13
/dev/sdb9 /dev/sde4 /dev/sdh13 /dev/sdk /dev/sdm5 /dev/sdp14
/dev/sdc /dev/sde5 /dev/sdh14 /dev/sdk1 /dev/sdm6 /dev/sdp15
/dev/sdc1 /dev/sde6 /dev/sdh15 /dev/sdk10 /dev/sdm7 /dev/sdp2
/dev/sdc10 /dev/sde7 /dev/sdh2 /dev/sdk11 /dev/sdm8 /dev/sdp3
/dev/sdc11 /dev/sde8 /dev/sdh3 /dev/sdk12 /dev/sdm9 /dev/sdp4
/dev/sdc12 /dev/sde9 /dev/sdh4 /dev/sdk13 /dev/sdn /dev/sdp5
/dev/sdc13 /dev/sdf /dev/sdh5 /dev/sdk14 /dev/sdn1 /dev/sdp6
/dev/sdc14 /dev/sdf1 /dev/sdh6 /dev/sdk15 /dev/sdn10 /dev/sdp7
/dev/sdc15 /dev/sdf10 /dev/sdh7 /dev/sdk2 /dev/sdn11 /dev/sdp8
/dev/sdc2 /dev/sdf11 /dev/sdh8 /dev/sdk3 /dev/sdn12 /dev/sdp9
/dev/sdc3 /dev/sdf12 /dev/sdh9 /dev/sdk4 /dev/sdn13
/dev/sdc4 /dev/sdf13 /dev/sdi /dev/sdk5 /dev/sdn14

markush · 12-13-2010, 03:31 AM

Well, there must be a chance to find out which of those devices your mmc card is, I'd suggest to try to mount all /dev/sd*1 devices. /dev/sdh1 up to /dev/sdp1

Markus

priyadarshan · 12-13-2010, 03:49 AM

-sh-3.2# mount /dev/sdd1 /mnt/SD
mount: mounting /dev/sdd1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sde1 /mnt/SD
mount: mounting /dev/sde1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdf1 /mnt/SD
mount: mounting /dev/sdf1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdg1 /mnt/SD
mount: mounting /dev/sdg1 on /mnt/SD failed: No such device or address

-sh-3.2# mount /dev/sdh1 /mnt/SD
mount: mounting /dev/sdh1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdi1 /mnt/SD
mount: mounting /dev/sdi1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdj1 /mnt/SD
mount: mounting /dev/sdj1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdk1 /mnt/SD
mount: mounting /dev/sdk1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdl1 /mnt/SD
mount: mounting /dev/sdl1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdm1 /mnt/SD
mount: mounting /dev/sdm1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdn1 /mnt/SD
mount: mounting /dev/sdn1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdo1 /mnt/SD
mount: mounting /dev/sdo1 on /mnt/SD failed: No such device or address
-sh-3.2# mount /dev/sdp1 /mnt/SD
mount: mounting /dev/sdp1 on /mnt/SD failed: No such device or address