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vrf Strange Behavior of Direct IO

Question asked by michael.asbery on Feb 12, 2004
<html><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 10 (filtered)"><style><!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal     {margin:0in;     margin-bottom:.0001pt;     font-size:12.0pt;     font-family:"Times New Roman";}a:link, span.MsoHyperlink     {color:blue;     text-decoration:underline;}a:visited, span.MsoHyperlinkFollowed     {color:purple;     text-decoration:underline;}span.EmailStyle17     {font-family:Arial;     color:windowtext;}@page Section1     {size:8.5in 11.0in;     margin:1.0in 1.25in 1.0in 1.25in;}div.Section1     {page:Section1;}--></style></head><body lang=EN-US link=blue vlink=purple><div class=Section1><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I was working on my development platform this morning andthought I had completed my program, when I started to get errors.  </span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Target Platform: HP743 Embedded VXI PC running HP-UX 10.2 /HPVEE 5.01</span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Instrument : HP1472A RF Mux Switch (Same VXI Chassis)</span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>My program uses DIO to talk to the switches.  It hadbeen working all morning.  Now every time I send a command to close aswitch, I get an error “Device not Found”</span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I then dropped a panel driver for the switch onto theprogram and it can communicate just fine.  Go back to DIO and “Devicenot found”.  Thinking it might be a corrupt memory process, I evenrebooted the computer a couple of times, and I still get the above errormessages.</span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Has anyone seen this behavior before?  Any Ideas on howto fix it?</span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks,</span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Mike</span></font></p><p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font></p><p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>***********************************************************
Michael N.Asbery               (202)404-3014, DSN 754
US Naval Research Laboratory      fax (202)404-7661
Code5733.20                   michael.asbery@nrl.navy.mil
</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;  font-family:"Courier New"'>4555 Overlook Ave SW</span></font><font size=2face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;  font-family:"Courier New"'>Washington</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> </span></font><font  size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>DC</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'> </span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;  font-family:"Courier New"'>20375</span></font><font size=2 face="Courier New"><spanstyle='font-size:10.0pt;font-family:"Courier New"'>                                    :-)
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