https://becomwiki.live.md-websolutions.com/index.php?action=history&feed=atom&title=SDHC_controller_%28SBC-i.MX51%29SDHC controller (SBC-i.MX51) - Versionsgeschichte2026-05-13T13:30:23ZVersionsgeschichte dieser Seite in BECOM Systems SupportMediaWiki 1.43.5https://becomwiki.live.md-websolutions.com/index.php?title=SDHC_controller_(SBC-i.MX51)&diff=156&oldid=prevPeter: 1 Version importiert2023-10-31T08:03:07Z<p>1 Version importiert</p>
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<p><b>Neue Seite</b></p><div>The SD card slot on the SBC-i.MX51 is connected to the eSDHC controller #1 of the i.MX51 processor.<br />
See chapter 31 of the i.MX51 Reference Manual for detailed information.<br />
<br />
SDHC cards [https://en.wikipedia.org/wiki/Secure_Digital#SDHC] are supported.<br />
<br />
== Kernel configuration ==<br />
<br />
Device Drivers ---><br />
<*> MMC/SD/SDIO card support ---><br />
<*> MMC block device driver<br />
[*] Use bounce buffer for simple hosts<br />
<*> Freescale i.MX Secure Digital Host Controller Interface support<br />
<br />
File systems ---><br />
<*> Ext3 journalling file system support<br />
[*] Ext3 extended attributes<br />
(choose file systems that you want to use)<br />
<br />
== Test in Linux ==<br />
<br />
Insert a card into the SD slot. Linux will automatically detect the card and create the device files<br />
/dev/mmcblk0<br />
/dev/mmcblk0p1<br />
/dev/mmcblk0p2<br />
...<br />
for the card itself and its partitions.<br />
<br />
We will now create a single partition on the SD card, format it with the EXT3 file system, write a random file to it, and read it back:<br />
<br />
* Create single partition:<br />
fdisk /dev/mmcblk0<br />
p (prints partition table)<br />
d (deletes existing partitions) ...repeat until no partitions exist<br />
n (adds a new parition) ...maximum size<br />
w (writes partition table and exits)<br />
<br />
* Make ext3 file system and mount it:<br />
mkfs.ext3 /dev/mmcblk0p1<br />
mkdir /mnt/sdcard<br />
mount /dev/mmcblk0p1 /mnt/sdcard<br />
<br />
* Create random file:<br />
dd if=/dev/urandom of=/randomfile bs=1M count=1<br />
<br />
* Copy random file to SD card and unmount card:<br />
cp /randomfile /mnt/sdcard<br />
umount /mnt/sdcard<br />
<br />
* Mount SD card again and check randomfile:<br />
mount /dev/mmcblk0p1 /mnt/sdcard<br />
diff /mnt/sdcard/randomfile /randomfile<br />
<br />
''diff'' must not output anything, which means the files are 100% identical.<br />
<br />
== Booting from SD card ==<br />
See page [[Boot media (SBC-i.MX51)|Boot media]].<br />
<br />
== Performance ==<br />
We have measured the following speeds with a SanDisk SDHC 4GB card:<br />
*Read: 13.0 MiB/s<br />
*Write: 6.3 MiB/s<br />
<br />
[[Category:SBC-i.MX51]]<br />
[[Category:i.MX]]</div>en>Peter