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what is the reason for this mmc reading problem in linux ..? please help to solve this...? please check my kernel booting log below help me to solve this..

I have enabled the relevant drivers for mmc compiled and booted with with newly created kernel image I am getting the kernel boot loogs as shown below 

mmc0: card lacks mandatory switch function, performance might suffer.           
mmc0: host does not support reading read-only switch. assuming write-enable.    
mmc0: new SD card at address b368                                               
mmcblk0: mmc0:b368 SMI-S 8.00 MiB                                               
 mmcblk0:                                                                       
mmcblk0: retrying using single block read                                       
mmcblk0: error -110 transferring data, sector 0, nr 8, card status 0xb00        
end_request: I/O error, dev mmcblk0, sector 0                                   
mmcblk0: error -110 sending read/write command, response 0xb00, card status 0x40
end_request: I/O error, dev mmcblk0, sector 1                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 2                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 3                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 4                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 5                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 6                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 7                                   
Buffer I/O error on device mmcblk0, logical block 0                             
mmcblk0: retrying using single block read                                       
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 0                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 1                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 2                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 3                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 4                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 5                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 6                                   
mmcblk0: error -110 sending read/write command, response 0x400b00, card status 0
end_request: I/O error, dev mmcblk0, sector 7                                   
Buffer I/O error on device mmcblk0, logical block 0                             
unable to read partition table
amar
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  • Do you have any independent verification that the electrical connection to the card is proper? Do you know from usage in another device that the card has a valid filesystem? Have you tried another card? – Chris Stratton Sep 20 '13 at 18:09
  • yeah the card is working properly in my mobile. I have FAT file system on it. – amar Sep 23 '13 at 03:46
  • Looks like cmd17 single read timeout error when reading the partition table information. However from the beginning, here is "mmcblk0: retrying using single block read ". That means you should have a CMD18 read error log there at first then the host retry to read the partition table via CMD17 one by one. But I can't see it. How about to open the CONFIG_MMC_DEBUG to get more information ? – wbao Sep 25 '13 at 09:29

1 Answers1

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Error -110 means timeout. Basically, your MMC controller is not able to talk correctly with your SD card. It usually happens when your card is not correctly inserted in the slot (for example the spring is pushing back your card too far) or maybe you are using a micro SD card and it is not correctly inserted in the SD card adapter. Want can also happen is that your SD card adapter is slightly broken and some connections are not correctly made (e.g. your card has negotiated 4 bits mode and some lines are in fact not connected).

Alexandre Belloni
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  • Pulled micro SD out of SD adapter and placed back in adapter. Fixed! And to think other posts were claiming the card was toast! – Joseph Lust Sep 03 '14 at 01:44