OpenWrt confused on partitions on Micro SD card?

Xiangfu Liu xiangfu at sharism.cc
Wed Jan 5 20:50:46 EST 2011


Hi Lars

thanks for the info. 

On 01/06/2011 06:51 AM, Lars-Peter Clausen wrote:
> On 01/05/2011 11:25 PM, Lars-Peter Clausen wrote:
>> > 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
>> > 
> I just had a closer look and you could also set mmcblk.perdev_minors=x in the kernel
> cmdline, where is is the maximum number of partitions you want to support minus one.
> So for 9 partitions set it 10.
> 


-- 
Best Regards
Xiangfu
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