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<DIV><FONT face=Verdana color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Verdana color=#000080 size=2>hi.how can i get the documents
about the fault tolerrance utility(eg EDAC)in rtems?</FONT></DIV>
<DIV><FONT face=Verdana color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Verdana color=#c0c0c0 size=2>2008-06-04 </FONT></DIV><FONT
face=Verdana color=#000080 size=2>
<HR style="WIDTH: 122px; HEIGHT: 2px" align=left SIZE=2>
</FONT>
<DIV><FONT face=Verdana color=#c0c0c0 size=2><SPAN>
<DIV>
<DIV><FONT face=Verdana size=2>best wishes<IMG
src="cid:__0@Foxmail.net"></FONT></DIV></DIV></SPAN></FONT></DIV><FONT
face=Verdana color=#000080 size=2>
<HR>
</FONT>
<DIV><FONT face=Verdana size=2><STRONG>发件人：</STRONG> Teng Chee Wan Philip
</FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>发送时间：</STRONG> 2008-06-03 13:00:18
</FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>收件人：</STRONG> rtems-users@rtems.org;
Nicolas Horro </FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>抄送：</STRONG> </FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG>主题：</STRONG> RE: ERC32 EDAC Driver
</FONT></DIV>
<DIV><FONT face=Verdana size=2></FONT> </DIV>
<DIV><FONT face=Verdana size=2>
<DIV>Hi Nicolas,</DIV>
<DIV> </DIV>
<DIV>Why are you modifying the checkbits for the EDAC test (ie, instead of</DIV>
<DIV>0xC, you use 0xD)? By doing so, the processor may detect that there are</DIV>
<DIV>more than 1 bit of error in the data word. You should be loading 0xC as</DIV>
<DIV>the checkbits, and write 0x0000 0002 as the data word (which means 1 bit</DIV>
<DIV>error in the data word, since 0xC is the correct checkbits pattern for</DIV>
<DIV>0x0000 0001).</DIV>
<DIV> </DIV>
<DIV>If there are more than 1 bit of error, the processor will generate a</DIV>
<DIV>non-correctable error in the memory, which is 0x9 Data Access trap.</DIV>
<DIV>That is probably what you are observing.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV>Philip</DIV>
<DIV> </DIV>
<DIV>========================================================================</DIV>
<DIV>====</DIV>
<DIV>Date: Mon, 2 Jun 2008 16:13:16 -0300</DIV>
<DIV>From: "Nicolas Horro" <nhorro@gmail.com ></DIV>
<DIV>Subject: ERC32 EDAC Driver</DIV>
<DIV>To: rtems-users@rtems.org</DIV>
<DIV>Message-ID:</DIV>
<DIV><48cfa58b0806021213n5d6b1f30jfba9d1afba14b1ff@mail.gmail.com ></DIV>
<DIV>Content-Type: text/plain; charset="iso-8859-1"</DIV>
<DIV> </DIV>
<DIV>Hi,</DIV>
<DIV> </DIV>
<DIV>I'm working on a simple EDAC driver for ERC32. Tests running on SIS do</DIV>
<DIV>nothing and tests running on real hardware produce trap 0x9 (not 0x16,</DIV>
<DIV>as it</DIV>
<DIV>would be expected).</DIV>
<DIV> </DIV>
<DIV>Driver (basically) does the following:</DIV>
<DIV> </DIV>
<DIV>1. Ensure EDAC is turned on in MEMCFR:</DIV>
<DIV> </DIV>
<DIV>ERC32_MEC.Memory_Configuration |= 0x00004000;</DIV>
<DIV> </DIV>
<DIV>2. Install ISR handler:</DIV>
<DIV> </DIV>
<DIV>/* EDAC_Correction_Handler */</DIV>
<DIV>rtems_isr EDAC_Correction_Handler( rtems_vector_number vector ) {</DIV>
<DIV> ++_Sram_Edac.errorCount;</DIV>
<DIV> *( (uint32_t*)ERC32_MEC.First_Failing_Address) =</DIV>
<DIV> *( (uint32_t*)ERC32_MEC.First_Failing_Address);</DIV>
<DIV>}</DIV>
<DIV> </DIV>
<DIV>(...)</DIV>
<DIV> </DIV>
<DIV>/* install handler */</DIV>
<DIV>rtems_interrupt_catch( EDAC_Correction_Handler,</DIV>
<DIV> </DIV>
<DIV>ERC32_TRAP_TYPE(ERC32_INTERRUPT_CORRECTABLE_MEMORY_ERROR),</DIV>
<DIV> &old );</DIV>
<DIV> </DIV>
<DIV>For testing, I'm using a function to write a value with checkbits and</DIV>
<DIV>another to read it and produce EDAC trap if checkbits are wrong:</DIV>
<DIV> </DIV>
<DIV>--- file: EDACTest.c --</DIV>
<DIV> </DIV>
<DIV>(...)</DIV>
<DIV> </DIV>
<DIV>uint32_t a;</DIV>
<DIV> </DIV>
<DIV>/* Intentionally write value with wrong CheckBits (Correct CB: 0x2C) */</DIV>
<DIV>writeValueWithCheckBits(&a, 0x01, 0x2D):</DIV>
<DIV> </DIV>
<DIV>/* Attempt to read so Trap 0x16 occurs */</DIV>
<DIV>readAddress(&a);</DIV>
<DIV> </DIV>
<DIV>(...)</DIV>
<DIV> </DIV>
<DIV>/***********************************************************************</DIV>
<DIV>******/</DIV>
<DIV>void writeValueWithCheckBits(uint32_t* address,</DIV>
<DIV> uint32_t value,</DIV>
<DIV> uint32_t checkbits )</DIV>
<DIV>/***********************************************************************</DIV>
<DIV>******/</DIV>
<DIV>{</DIV>
<DIV> // Enable EDAC Test Mode in TESTCTR</DIV>
<DIV> printf("EDAC Test$ Enabling EDAC Test Mode in Test Control</DIV>
<DIV>Register.\n");</DIV>
<DIV> ERC32_MEC.Test_Control = 0x20000;</DIV>
<DIV> </DIV>
<DIV> // Setting check bits</DIV>
<DIV> printf("EDAC Test$ Writing check bits.\n");</DIV>
<DIV> ERC32_MEC.Test_Control |= checkbits;</DIV>
<DIV> </DIV>
<DIV> // Write value affected by check bits</DIV>
<DIV> printf("EDAC Test$ Writing '0x%08x' at address '0x%08x'.\n", value,</DIV>
<DIV>address);</DIV>
<DIV> *address = value;</DIV>
<DIV> </DIV>
<DIV> // Disable EDAC Test Mode in TESTCTR</DIV>
<DIV> printf("EDAC Test$ Disabling EDAC Test Mode in Test Control</DIV>
<DIV>Register.\n");</DIV>
<DIV> ERC32_MEC.Test_Control &= ~0x20000;</DIV>
<DIV>}</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>/***********************************************************************</DIV>
<DIV>******/</DIV>
<DIV>void readAddress(uint32_t* address)</DIV>
<DIV>/***********************************************************************</DIV>
<DIV>******/</DIV>
<DIV>{</DIV>
<DIV> uint32_t tmp;</DIV>
<DIV> </DIV>
<DIV> // Read address</DIV>
<DIV> printf("EDAC Test$ Reading address '0x%08x'. If wrong checkbits,</DIV>
<DIV>EDAC</DIV>
<DIV>trap should occur.\n", address);</DIV>
<DIV> tmp = address;</DIV>
<DIV> </DIV>
<DIV> printf("EDAC Test$ Address content is: '0x%08x'.\n", tmp);</DIV>
<DIV>}</DIV>
<DIV> </DIV>
<DIV>(...)</DIV>
<DIV> </DIV>
<DIV>Any suggestion? Obviously I'm doing something wrong, but I can't figure</DIV>
<DIV>out</DIV>
<DIV>what it is.</DIV>
<DIV> </DIV>
<DIV>Greetings and thanks!</DIV>
<DIV> </DIV>
<DIV>Nicol?s Eduardo Horro</DIV>
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