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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 04-17-2009, 06:31 AM   #1
richmgb
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Registered: Jan 2008
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device mount point/driver access


Hi,
This question deals with device mounting - mapping a mount point 'back' to a device driver.

I have a running Beagleboard utilizing Angstrom distribution RFS via NFS on my Slackware (12.1) based laptop. I can access the 'data' partition (1) of an on-board SD via /media/card mount point. My goal is to pare down the RFS (from the ~280MB), making it as small as possible with the minimum drivers installed to get at key HW, such as the SD.

I successfully created a new 'teeny' RFS with minimum capability & hit a road block trying to install SD support. Going back to the Angstrom RFS, I could not determine a mount point in (/dev) and which kernel driver(s) are required. Since the SD can be removed, I'm assuming it is a 'hotplug' device thus handled by UDEV? I found SD references in UDEV related scripts but could not find mention of a specific device driver.

I'm able to build the kernel (2.6.29)/drivers & thus observe diagnostics when the drivers are installed; I did this for the SD/MMC related drivers that are built-in to the kernel. I did not see any diagnostic output - even though I can get at the card as mentioned above.

I'm able to wade thru /proc & /sys & observe SD/MMC references but I'm not expert make the mount point linkage - my goal is to find (and install) the required driver for SD access. I can even bypass the hot-plug capability for my environment.

Any help here is appreciated ..

thanks ...
 
Old 04-18-2009, 03:04 AM   #2
ljkenny
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Registered: Apr 2009
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It may sound simple (sometimes these are the things we overlook), but have you tried 'wading' though the start-up messages via dmesg.

Try:
Code:
$ dmesg | grep -i sd | less
Or:
Code:
$ dmesg | grep -i mmc | less
Just a thought.

If this fails, I'll try and help you further in a while.
 
Old 04-18-2009, 03:13 AM   #3
ljkenny
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Registered: Apr 2009
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It's just hit me.

Isn't SD closed source? Hence not in the Kernel.

I think SD cards are usually modules.

If that's the case do an lsmod to see what it's called.

Once you know the name of it, grep the start-up scripts and see where it's insmod(ed) or modprobe(d).

If an MMC driver will do, it will be in kernel/drivers/mmc. Just look for the *.o file in there.
 
  


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