probably a simple question but i'd like to play with the MMC driver; in particular, i want to experiment with the mmc_test module on my ubuntu laptop if that's possible. i've configured the kernel so that i have a loadable mmc_test module and i can certainly load and unload it, and i found what looks like a coherent example of its use here: http://us.generation-nt.com/answer/patch-mmc-test-move-files-sysfs-debugfs-h... the problem *seems* to be that, when i insert an SD card into the slot on my ubuntu laptop, what shows up in /var/log/messages is: May 25 10:41:50 lynx kernel: [44208.051370] usb 1-1.1: new high speed USB device number 9 using ehci_hcd May 25 10:41:50 lynx kernel: [44208.177928] scsi10 : usb-storage 1-1.1:1.0 May 25 10:41:51 lynx kernel: [44209.173498] scsi 10:0:0:0: Direct-Access Generic- Multi-Card 1.00 PQ: 0 ANSI: 0 CCS May 25 10:41:51 lynx kernel: [44209.174871] sd 10:0:0:0: Attached scsi generic sg2 type 0 May 25 10:41:52 lynx kernel: [44210.332466] sd 10:0:0:0: [sdb] 7729152 512-byte logical blocks: (3.95 GB/3.68 GiB) May 25 10:41:52 lynx kernel: [44210.333320] sd 10:0:0:0: [sdb] Write Protect is off May 25 10:41:52 lynx kernel: [44210.339425] sdb: sdb1 sdb2 sdb3 May 25 10:41:52 lynx kernel: [44210.341786] sd 10:0:0:0: [sdb] Attached SCSI removable disk May 25 10:41:53 lynx kernel: [44210.846189] EXT3-fs: barriers not enabled May 25 10:41:53 lynx kernel: [44210.847598] kjournald starting. Commit interval 5 seconds May 25 10:41:53 lynx kernel: [44210.866802] EXT3-fs (sdb2): using internal journal May 25 10:41:53 lynx kernel: [44210.866810] EXT3-fs (sdb2): mounted filesystem with ordered data mode ... snip ... so that, clearly, this linux 2.6.39+ kernel sees the device as SCSI, handled by the usb-storage driver. under the circumstances, how would i (if it's even possible) access the card at the level necessary to run things like MMC tests? obviously, i would first unmount the two filesystems on it since those tests are destructive. but i've loaded the mmc_test module and inserted the card, and i don't see the appropriate subdirectory under /sys/kernel/debug. would someone with MMC/SD experience point me in the right direction as to how to start accessing the card at the driver level from user space, given my situation above? thanks. rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================