How to distinguish sd cards

can you use udev rules to properly populate "/dev" nodes. It can automatically detect the devices after parsing /sys entries and populate /dev nodes.

Hi Gururaja.

Unfortunately, as i understand, udev cannot parse parent devices. And i cannot find where it populates mmcblk nodes.

Best regards,

Alexander Vasiljev.

Alexander,

I'm not sure about the standard way of solving this. But there is a way to solve this. First you reorder the array of MMC devices listed in the board file in the order such a way that the host controller for the inner card comes first. Since the driver will enumerate devices in this order it will try to enumerate the inner card first. And finally in your product since the inner card is always present, it will always become mmcblk0. So whenever the external card is inserted, it always will become mmcblk1.

Renjith,

The problem is that in some models of our device the inner card will present and in some will not. So i come to mind to use not very elegant solution like parsing /sys/ directory.

Best regards,

Alexander Vasiljev.

Alexander,

Good problem to solve. I'll try to figure this out. Meanwhile, let me know if you solve this issue.