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<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Hello,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>I am working in Linux MMC driver.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Recently I came across one 16GB MMC card where EXT_CSD
Register having EXT_CSD_REV[192] field as ZERO, which is valid according to
Specification. But card is not working due to following reason -<o:p></o:p></span></font></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>As we know there are two
fields in Extended CSD Register - CSD_STRUCTURE Version[194] &
EXT_CSD_REV Revision [192]. <o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal style='margin-left:.25in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=2 type=1>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>In mmc.c/ mmc_read_ext_csd ()<o:p></o:p></span></font></li>
<ol style='margin-top:0in' start=1 type=a>
<li class=MsoNormal style='mso-list:l1 level2 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>Implementation expecting EXT_CSD_REV
non zero (e.g. >3 in current code)<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l1 level2 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>I think it could be checking
for CSD_STRUCTURE version. <o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l1 level2 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>Because EXT_CSD_REV having <b><span
style='font-weight:bold'>Zero</span></b> is the valid Field. <o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l1 level2 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>This is the way it’s
done in other OS too.<o:p></o:p></span></font></li>
</ol>
</ol>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=3 type=1>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>To check the high capacity
card. <o:p></o:p></span></font></li>
<ol style='margin-top:0in' start=1 type=a>
<li class=MsoNormal style='mso-list:l1 level2 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>We could check in access mode
from OCR. This is not in Linux exactly and steps to check the
EXT_CSD_REV. <o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l1 level2 lfo3'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>This is done in some other OS
too. <o:p></o:p></span></font></li>
</ol>
</ol>
<p class=MsoNormal style='margin-left:.75in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><u><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>So do you think we can update the code to check the
CSD_STRUCTURE Version? Please let us know your opinion.<o:p></o:p></span></font></u></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><img width=675 height=143 id="_x0000_i1025"
src="cid:image001.gif@01CA357A.C599E580"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><img width=671 height=114 id="_x0000_i1026"
src="cid:image002.gif@01CA357A.C599E580"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Thanks & regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Sukumar Ghorai<o:p></o:p></span></font></p>
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