There is not a simple way of controlling the 'minor device number' (0, 1, ...) for a particular block device as this is based entirely upon the devb- driver start-up sequence.
You can however use the 'disk name=XXX' option to the cam-disk.so library to explicitly set the 'major device' string for a particular device to give it a unique and hardware specific prefix name.
For example if you were to have a system with multiple SD card devices (say one on the left and one on the right), you could use a command similar to the below command to explicitly give them a 'major device' string of "sd_left" and "sd_right".
devb-mmcsd blk cache=1M disk name=sd_left mmcsd vid=0x0001 devb-mmcsd blk cache=1M disk name=sd_right mmcsd vid=0x0002
The raw devices would then show up as: /dev/sd_left0 /dev/sd_right0
NOTE:
This entry has been validated against the SDP version listed above. Use
caution when considering this advice for any other SDP version. For
supported releases, please reach out to QNX Technical Support if you have any questions/concerns.
Please contact us with your questions or concerns.
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