DESK-XZU-L/Peripherals/SD
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| 2026/06/26 | DESK-XZU-L-2.x.x release | ||
Contents
Peripheral SD[edit | edit source]
The SD device, if present, will be associated by the Linux kernel to the mmcblk0 device:
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
root@onda:~# dmesg | grep mmc0 [ 2.642264] mmc0: SDHCI controller on ff170000.mmc [ff170000.mmc] using ADMA 64-bit [ 2.727822] mmc0: new high speed SDHC card at address aaaa [ 2.737966] mmcblk0: mmc0:aaaa SA16G 14.8 GiB
Additional information[edit | edit source]
Once detected, it can be mounted and accessed via usual Linux commands:
root@onda:~# mkdir -p /mnt/mmcblk0p1 root@onda:~# mkdir -p /mnt/mmcblk0p2 root@onda:~# mount /dev/mmcblk0p1 /mnt/mmcblk0p1 root@onda:~# mount /dev/mmcblk0p2 /mnt/mmcblk0p2 root@onda:~# ls /mnt/mmcblk0p1 BOOT.BIN boot.scr image.ub uboot-redund.env uboot.env root@onda:~# ls /mnt/mmcblk0p2 bin boot dev etc home lib lost+found media mnt proc root run sbin srv sys tmp usr var root@onda:~# 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, 0.560226 s, 187 MB/s root@onda:~# time cp test_file_100MB /mnt/mmcblk0p1 real 0m1.362s user 0m0.005s sys 0m1.235s root@onda:~#
