OpenWrt confused on partitions on Micro SD card?

Lars-Peter Clausen lars at metafoo.de
Wed Jan 5 17:25:15 EST 2011


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On 12/16/2010 11:14 PM, Delbert Franz wrote:
> I'm working up to some benchmarks on micro SD card and today I 
> partitioned a 8 GB card into eight partitions: First 3 are primary and 
> the remaining ones are logical.  Using cfdisk on the Nanonote numbers 
> the partitions: p1 through p9 with the base name of "mmcblk0".  This 
> all looks OK.  However, when the Nanonote is booted with the card 
> present in the micro SD slot, it come ups during boot up showing the 
> following pattern of partitions: 
> 
> p1 p2 p3 p4 <p5 p6 p7>
> 
> which is incorrect.  It should be 
> 
> p1 p2 p3 p4 < p5 p6 p7 p8 p9>.
> 

Hi

The kernel has only support for up to 7 partions. You can change this by setting
CONFIG_MMC_BLOCK_MINORS
to a higher number and recompile the kernel.

- - Lars

> When I hot-plug the card, the Nanonote tries to mount p4 but fails.  
> Automounting is really confused!  It mounts partitions: p1, p5, p6, 
> and p7.  One can mount p2 and p3 manually.  For some reason the 
> automounter tries to mount p4 and gets all confused because it has no 
> file system.  In the process it apparently "forgets" about p2 and p3:) 
> And it does not know that p8 and p9 exist. 
> 
> There is then some problem in the part of the software that recognizes 
> the partition table because it has it wrong and so the automounter 
> gets confused.  
> 
> I have had no problem with four primary partitions but logical 
> partitions are not being recognized properly.  So we can only get four 
> partitions automounted.  We can get six mounted if we use three 
> primary and three logical.  We have to mount p2 and p3 manually.  That 
> seems to be the limit.  When I repartition the card to have eight 
> logical partitions only p5, p6 and p7 are mounted.  Again the Nanonote 
> tries to mount p1 and of course fails:) 
> 
> Anyone else had this problem or found a way to work around it?  
> 
> Thanks, 
> 
>       Delbert
> 
> 
> 
> 
> 
> 
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