Re: how to firing device event when SD card inserting usb card reader

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hi Alan:

2014-06-26 23:57 GMT+08:00 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>:
> On Thu, 26 Jun 2014, loody wrote:
>
>> hi all:
>> I try below flow:
>> 1. plug in usb card reader
>> 2. wait 2 seconds
>> 3. plug in SD card
>>
>> on ubuntu PC system, the udev can get SD plug in event
>> but on my embedded system, there is no udev plug event when SD plug in.
>>
>> Is this issue related to media change command?
>> if so, should I enable kernel config or do anything in user mode program?
>>
>> thanks for your help in advance,
>
> What does usbmon show?
after we enable CONFIG_SCSI_MULTI_LUN, we can udevent when SD plug in
card reader.

appreciate your kind help,
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