DESK-XZ7-L/Peripherals/SD
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microSD card[edit | edit source]
microSD card on connector J21, if present, will be associated by the Linux kernel to the mmcblk0 device:
[ 0.740571] mmc0: SDHCI controller on e0100000.mmc [e0100000.mmc] using ADMA ... [ 0.824174] mmc0: new high speed SDHC card at address aaaa [ 0.830415] mmcblk0: mmc0:aaaa SA16G 14.8 GiB [ 0.837970] mmcblk0: p1 p2
Once detected, it can be mounted and accessed via usual Linux commands:
root@bora:~# mkdir -p /mnt/mmcblk0p1 root@bora:~# mkdir -p /mnt/mmcblk0p2 root@bora:~# mount /dev/mmcblk0p1 /mnt/mmcblk0p1 root@bora:~# mount /dev/mmcblk0p2 /mnt/mmcblk0p2 root@bora:~# ls /mnt/mmcblk0p1 BOOT.BIN System Volume Information boot.scr image.ub root@bora:~# ls /mnt/mmcblk0p2 bin boot dev etc home lib lost+found media mnt proc run sbin sys tmp usr var root@bora:~# dd if=/dev/zero of=test_file_100MB bs=1M count=100 100+0 records in 100+0 records out 104857600 bytes (105 MB, 100 MiB) copied, 1.50526 s, 69.7 MB/s root@bora:~# time cp test_file_100MB /mnt/mmcblk0p1 real 0m3.006s user 0m0.011s sys 0m1.853s root@bora:~#
