[yocto] Mounting USB drives on a "read-only-rootfs" based system

[Mike Looijmans]

On 14-06-16 15:48, Jeffrey D Boyer wrote:
> Sorry, /media is not a symlink and there is no /run/media link or directory present on my running system.  When I insert an SD card, for example, I get a bit of text on the debug serial port that a card has been detected, but I don't see a mount point anywhere after that.
>
> 	root at mySys:/# mmc1: new high speed SDHC card at address 1234
> 	mmcblk1: mmc1:1234 SA04G 3.63 GiB
> 	 mmcblk1: p1
>
> It should be noted that if I exclude the " read-only-rootfs" option in the bb script, a normal read/write kernel image is produced and the action of inserting an SD card under those conditions will automatically produce a mount point at /media/mmcblk1p1

Apparently your distro or image or whatever is lacking some directories. The 
/run/media should have been created automagically.

Are you using udev or mdev for hotplug?

For mdev, I implemented the automounting using /run/media and that should also 
work on read-only-rootfs systems. So I can probably figure out what's wrong 
with your config.

For udev, I don't have a clue, sorry...


> FYI, I'm running 3.14 kernel.  Is this a job for aufs?  If so, how would I go about configuring it?

No, it's not related to autofs or aufs or whatever. It's plain simple udev or 
mdev.



Kind regards,

Mike Looijmans
System Expert

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