title: what is the reason for this mmc reading in linux
body: <p>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.. </p>
  
  <p>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 </p>
  
  <pre><code>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
  </code></pre>