On Fri, Nov 21, 2014 at 9:11 AM, Robert Nelson <robertcnel...@gmail.com> wrote:
> Humm... So i picked up an SDXC card a few weeks back, but this
> conversation reminded me i should just test it to prove it for once an
> and all... Well...
>
>
> debian@beaglebone:~$ uname -r
> 3.8.13-bone67
> debian@beaglebone:~$ dmesg
> [   98.159775] mmc0: host does not support reading read-only switch.
> assuming write-enable.
> [   98.161943] mmc0: new high speed SDXC card at address aaaa
> [   98.165780] mmcblk1: mmc0:aaaa SU64G 59.4 GiB
> [   98.169334]  mmcblk1: p1
> [  172.261473]  mmcblk1: p1
> [  277.923870] EXT4-fs (mmcblk1p1): mounted filesystem with ordered
> data mode. Opts: (null)
>
> (mmcblk1 is SDXC)
> debian@beaglebone:~$ sudo hdparm -tT /dev/mmcblk1
>
> /dev/mmcblk1:
>  Timing cached reads:   448 MB in  2.00 seconds = 224.03 MB/sec
>  Timing buffered disk reads:  58 MB in  3.02 seconds =  19.23 MB/sec
>
> (mmcblk0 is eMMC which i booted off of..)
> debian@beaglebone:~$ sudo hdparm -tT /dev/mmcblk0
>
> /dev/mmcblk0:
>  Timing cached reads:   424 MB in  2.01 seconds = 211.39 MB/sec
>  Timing buffered disk reads:  66 MB in  3.05 seconds =  21.66 MB/sec
>
> Well let's see if i can boot off the SDXC card..

Zero'ed out the eMMC:

debian@beaglebone:~$ lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
mmcblk1boot0 179:16   0     1M  1 disk
mmcblk1boot1 179:24   0     1M  1 disk
mmcblk0      179:0    0  59.5G  0 disk
└─mmcblk0p1  179:1    0  59.5G  0 part /
mmcblk1      179:8    0   1.8G  0 disk
debian@beaglebone:~$ dmesg | grep mmcblk0
[    0.870861] mmcblk0: mmc0:aaaa SU64G 59.4 GiB
[    0.872373]  mmcblk0: p1
[    2.624594] EXT4-fs (mmcblk0p1): mounted filesystem with ordered
data mode. Opts: (null)
[    7.353348] EXT4-fs (mmcblk0p1): re-mounted. Opts: (null)
[    8.346567] EXT4-fs (mmcblk0p1): re-mounted. Opts: errors=remount-ro
[   25.319932]  lun0: LUN: removable file: /dev/mmcblk0p1

This is a:

SanDisk Ultra 64GB micro SDXC

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/

-- 
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