On Wed, Oct 8, 2014 at 9:45 PM, Josh Cartwright [off-list ref] wrote:

This has bitten me more times than I care to admit, but have you checked
that you've set CONFIG_MMC_BLOCK_MINORS higher than 16?  Perhaps we
should be doing that in qcom_defconfig if we aren't already.

ouch... i was using multi_v7_defconfig which indeed has:

CONFIG_MMC_BLOCK_MINORS=16

note that you can override the default CONFIG with bootargs with

mmcblk.perdev_minors=32

thanks!