Kontron AM4211 - Manual (Page 57)

42 AM4211
www.kontron.com
There are 3 different types of bootloader environment variables:
• Script: The variable is a set of consecutive (more simple) bootloader commands to perform a specific
task. A command script is invoked using the ‘run ’ syntax. E.g. the ‘run nuke_env’ <br>command would erase the bootloader environment sectors causing the bootloader to use its <br>default environment upon next restart.</p><p style="position:absolute;top:628px;left:156px;white-space:nowrap" class="ft02">•</p><p style="position:absolute;top:627px;left:168px;white-space:nowrap" class="ft03"><b>Var</b>: The variable controls a specific behavior of the bootloader startup sequence. E.g. the </p><p style="position:absolute;top:648px;left:177px;white-space:nowrap" class="ft010">‘bootdelay’ variable controls the time u-boot waits before execution of the bootcmd which <br>normally loads and starts the Linux kernel.</p><p style="position:absolute;top:704px;left:156px;white-space:nowrap" class="ft02">•</p><p style="position:absolute;top:703px;left:168px;white-space:nowrap" class="ft03"><b>Auto</b>: The variable is automatically set during bootloader startup sequence. E.g. the ‘postresult’ </p><p style="position:absolute;top:724px;left:177px;white-space:nowrap" class="ft02">variable stores the result of the POST.</p><p style="position:absolute;top:760px;left:108px;white-space:nowrap" class="ft010">It is possible to modify environment variables and start the pre-defined scripts from the bootloader shell. It <br>is strongly recommended not to modify the pre-defined script variables. However, definition and execution <br>of user-defined script variables can be done.</p><p style="position:absolute;top:914px;left:108px;white-space:nowrap" class="ft02">For additional information about u-boot, refer to </p><p style="position:absolute;top:914px;left:442px;white-space:nowrap" class="ft04"><noindex><a rel="nofollow" href="http://sourceforge.net/projects/u-boot/">http://sourceforge.net/projects/u-boot/</a></noindex></p><p style="position:absolute;top:950px;left:108px;white-space:nowrap" class="ft010">Modification of bootloader environment variables is done using the ‘setenv’ and ‘saveenv’ bootloader CLI <br>commands. In the following example, the new environment script variable ‘bootcmdmyscript’ is defined. In <br>addition, bootdelay is increased to 10. Finally, all changes are stored into flash environment sector.</p><p style="position:absolute;top:1027px;left:152px;white-space:nowrap" class="ft011"><b>Kontron T5519# setenv bootcmdmyscript ‘bootp; tftpboot ${loadaddr} myimg.multi; bootm ${loadaddr}’<br>Kontron T5519# setenv bootdelay 10<br>Kontron T5519# saveenv</b></p><p style="position:absolute;top:150px;left:117px;white-space:nowrap" class="ft06">watchdogos</p><p style="position:absolute;top:150px;left:314px;white-space:nowrap" class="ft06">Var</p><p style="position:absolute;top:131px;left:369px;white-space:nowrap" class="ft012">0 – disable OS load watchdog (default)<br>15...n – timeout in seconds before load OS watchdog fires<br>Note: This is the pOSWD watchdog</p><p style="position:absolute;top:201px;left:117px;white-space:nowrap" class="ft06">ignoreposterr</p><p style="position:absolute;top:201px;left:314px;white-space:nowrap" class="ft06">Var</p><p style="position:absolute;top:192px;left:369px;white-space:nowrap" class="ft012">0 – stop boot process if power on self test errors are detected<br>1 – continue boot in the presence of power on self test errors (default)</p><p style="position:absolute;top:253px;left:117px;white-space:nowrap" class="ft06">postresult</p><p style="position:absolute;top:253px;left:314px;white-space:nowrap" class="ft06">Auto</p><p style="position:absolute;top:234px;left:369px;white-space:nowrap" class="ft012">Contains the power on self tests results:<br>0 - POST successful (default), <br>1 - POST failed</p><p style="position:absolute;top:313px;left:117px;white-space:nowrap" class="ft06">memtest</p><p style="position:absolute;top:313px;left:314px;white-space:nowrap" class="ft06">Var</p><p style="position:absolute;top:295px;left:369px;white-space:nowrap" class="ft012">0 = no DRAM test during POST<br>1 - quick DRAM test (default)<br>2 - full DRAM test</p><p style="position:absolute;top:373px;left:117px;white-space:nowrap" class="ft06">bootstopkey</p><p style="position:absolute;top:373px;left:314px;white-space:nowrap" class="ft06">Var</p><p style="position:absolute;top:355px;left:369px;white-space:nowrap" class="ft06">string to wait for during startup. If this string is entered, U-Boot will interrupt the </p><p style="position:absolute;top:371px;left:369px;white-space:nowrap" class="ft012">boot process, stop the watchdog and will start its internal command line interface. <br>default: “stop”</p><p style="position:absolute;top:849px;left:161px;white-space:nowrap" class="ft07"> </p><p style="position:absolute;top:837px;left:421px;white-space:nowrap" class="ft08"><b>CAUTION</b></p><p style="position:absolute;top:861px;left:222px;white-space:nowrap" class="ft013">Changing bootloader environment variables must be taken very carefully. It will <br>change system behavior and can lead to a non-booting system</p><p style="position:absolute;top:849px;left:717px;white-space:nowrap" class="ft07"> </p><p style="position:absolute;top:108px;left:116px;white-space:nowrap" class="ft09">Name</p><p style="position:absolute;top:108px;left:313px;white-space:nowrap" class="ft09">Type</p><p style="position:absolute;top:108px;left:369px;white-space:nowrap" class="ft09">Description</p></div> </div> <div class="manual-page-original" itemscope="itemscope" itemtype="https://schema.org/ImageObject" data-img="/screens/655283/57.png" style="display: none;"> </div> </div> <a href="/manuals/637920/kontron-am4211.html?page=56" class="manual-view__prev -onpage-nav" title="Previous (← + Ctrl)" aria-label="Previous page"><svg class="svg-icon"><use xlink:href="#icon-arrow-6"></use></svg></a> <a href="/manuals/637920/kontron-am4211.html?page=58" class="manual-view__next -onpage-nav" title="Next (Ctrl + →)" aria-label="Next page"><svg class="svg-icon"><use xlink:href="#icon-arrow-6"></use></svg></a> </div> </div> <nav class="inline-nav inline-nav--dark-grey inline-nav--bottom"> <div class="pager pager--left" id="def-pager"> <span class="pager__label">Pages:</span> <a class="pager__a pager__prev" aria-label="Previous page" href="/manuals/637920/kontron-am4211.html?page=56"><svg class="svg-icon"><use xlink:href="#icon-arrow-2"></use></svg></a> <a class="pager__a pager__number" href="/manuals/637920/kontron-am4211.html">1</a> <span class="pager__hellip">…</span> <a class="pager__a pager__number" href="/manuals/637920/kontron-am4211.html?page=55">55</a> <a class="pager__a pager__number" href="/manuals/637920/kontron-am4211.html?page=56">56</a> <span class="pager__a pager__number active">57</span> <a class="pager__a pager__number" href="/manuals/637920/kontron-am4211.html?page=58">58</a> <a class="pager__a pager__number" href="/manuals/637920/kontron-am4211.html?page=59">59</a> <span class="pager__hellip">…</span> <a class="pager__a pager__number" href="/manuals/637920/kontron-am4211.html?page=82">82</a> <a class="pager__a pager__next" aria-label="Next page" href="/manuals/637920/kontron-am4211.html?page=58"><svg class="svg-icon"><use xlink:href="#icon-arrow-3"></use></svg></a> </div> <div class="complain"> <div class="popup-menu complain__menu" id="complain-wnd" style="display: none;"> <ul> <li><a href="javascript:" class="ajax-link" data-type="brand">wrong Brand</a></li> <li><a href="javascript:" class="ajax-link" data-type="model">wrong Model</a></li> <li><a href="javascript:" class="ajax-link" data-type="readability">non readable</a></li> </ul> </div> </div> </nav> </div> </div> </div> <div class="manual-related-docs"> <span class="title title--h2">See also other documents in the category Kontron Hardware:</span> <div class="manual-also-for__list"> <ul class="list-block__list"> <li> <a href="/manuals/637787/kontron-cp3003-v-uefi-bios-cp3003-sa-uefi-bios.html"> <span class="model-name">CP3003-SA uEFI BIOS</span> <span class="pages">(72 pages)</span> </a> </li> <li> <a href="/manuals/637788/kontron-cp3003-v-cp3003-sa.html"> <span class="model-name">CP3003-SA</span> <span class="pages">(36 pages)</span> </a> </li> <li> <a href="/manuals/637789/kontron-cp3002.html"> <span class="model-name">CP3002</span> <span class="pages">(38 pages)</span> </a> </li> <li> <a href="/manuals/637790/kontron-cp3002-uefi-cp3002-ra-uefi-cp3002-rc-uefi.html"> <span class="model-name">CP3002-RC uEFI</span> <span class="pages">(64 pages)</span> </a> </li> <li> <a href="/manuals/637791/kontron-cp-rio3-05.html"> <span class="model-name">CP-RIO3-05</span> <span class="pages">(42 pages)</span> </a> </li> <li> <a href="/manuals/637792/kontron-cp3002-ra-cp3002-rc.html"> <span class="model-name">CP3002-RC</span> <span class="pages">(30 pages)</span> </a> </li> <li> <a href="/manuals/637793/kontron-cp342.html"> <span class="model-name">CP342</span> <span class="pages">(52 pages)</span> </a> </li> <li> <a href="/manuals/637794/kontron-cp930.html"> <span class="model-name">CP930</span> <span class="pages">(46 pages)</span> </a> </li> <li> <a href="/manuals/637795/kontron-cp932.html"> <span class="model-name">CP932</span> <span class="pages">(52 pages)</span> </a> </li> <li> <a href="/manuals/637796/kontron-cp346.html"> <span class="model-name">CP346</span> <span class="pages">(72 pages)</span> </a> </li> <li> <a href="/manuals/637797/kontron-cp384.html"> <span class="model-name">CP384</span> <span class="pages">(66 pages)</span> </a> </li> <li> <a href="/manuals/637798/kontron-cp383.html"> <span class="model-name">CP383</span> <span class="pages">(74 pages)</span> </a> </li> <li> <a href="/manuals/637799/kontron-cp382.html"> <span class="model-name">CP382</span> <span class="pages">(58 pages)</span> </a> </li> <li> <a href="/manuals/637800/kontron-cp381.html"> <span class="model-name">CP381</span> <span class="pages">(60 pages)</span> </a> </li> <li> <a href="/manuals/637801/kontron-cp372.html"> <span class="model-name">CP372</span> <span class="pages">(64 pages)</span> </a> </li> <li> <a href="/manuals/637802/kontron-cp371.html"> <span class="model-name">CP371</span> <span class="pages">(60 pages)</span> </a> </li> <li> <a href="/manuals/637804/kontron-cp-rio3-04s.html"> <span class="model-name">CP-RIO3-04S</span> <span class="pages">(38 pages)</span> </a> </li> <li> <a href="/manuals/637805/kontron-cp390.html"> <span class="model-name">CP390</span> <span class="pages">(36 pages)</span> </a> </li> <li> <a href="/manuals/637806/kontron-cps3410.html"> <span class="model-name">CPS3410</span> <span class="pages">(9 pages)</span> </a> </li> <li> <a href="/manuals/637807/kontron-cps3402.html"> <span class="model-name">CPS3402</span> <span class="pages">(9 pages)</span> </a> </li> <li> <a href="/manuals/637808/kontron-cps3105.html"> <span class="model-name">CPS3105</span> <span class="pages">(9 pages)</span> </a> </li> <li> <a href="/manuals/637809/kontron-cps3101.html"> <span class="model-name">CPS3101</span> <span class="pages">(9 pages)</span> </a> </li> <li> <a href="/manuals/637810/kontron-cps3003-sa.html"> <span class="model-name">CPS3003-SA</span> <span class="pages">(19 pages)</span> </a> </li> <li> <a href="/manuals/637811/kontron-pb-sio4.html"> <span class="model-name">PB-SIO4</span> <span class="pages">(34 pages)</span> </a> </li> <li> <a href="/manuals/637812/kontron-pb-sio4a.html"> <span class="model-name">PB-SIO4A</span> <span class="pages">(34 pages)</span> </a> </li> <li> <a href="/manuals/637814/kontron-pb-dout8.html"> <span class="model-name">PB-DOUT8</span> <span class="pages">(34 pages)</span> </a> </li> <li> <a href="/manuals/637817/kontron-vmod-2d-vmod-2.html"> <span class="model-name">VMOD-2</span> <span class="pages">(82 pages)</span> </a> </li> <li> <a href="/manuals/637818/kontron-vsbc-32.html"> <span class="model-name">VSBC-32</span> <span class="pages">(110 pages)</span> </a> </li> <li> <a href="/manuals/637819/kontron-vm62-vm42.html"> <span class="model-name">VM42</span> <span class="pages">(62 pages)</span> </a> </li> <li> <a href="/manuals/637820/kontron-bootstrap-loader.html"> <span class="model-name">Bootstrap Loader</span> <span class="pages">(24 pages)</span> </a> </li> <li> <a href="/manuals/637821/kontron-vmp1-with-netbootloader.html"> <span class="model-name">VMP1 with Netbootloader</span> <span class="pages">(120 pages)</span> </a> </li> <li> <a href="/manuals/637822/kontron-vmp1.html"> <span class="model-name">VMP1</span> <span class="pages">(106 pages)</span> </a> </li> <li> <a href="/manuals/637823/kontron-netbootloader.html"> <span class="model-name">NetBootLoader</span> <span class="pages">(86 pages)</span> </a> </li> <li> <a href="/manuals/637824/kontron-vmp2.html"> <span class="model-name">VMP2</span> <span class="pages">(142 pages)</span> </a> </li> <li> <a href="/manuals/637825/kontron-vmp3.html"> <span class="model-name">VMP3</span> <span class="pages">(154 pages)</span> </a> </li> <li> <a href="/manuals/637826/kontron-cp-rio6-923.html"> <span class="model-name">CP-RIO6-923</span> <span class="pages">(32 pages)</span> </a> </li> <li> <a href="/manuals/637827/kontron-cp-rio6-923-f.html"> <span class="model-name">CP-RIO6-923-F</span> <span class="pages">(32 pages)</span> </a> </li> <li> <a href="/manuals/637828/kontron-cp-rio6-001-hd-216-cp-rio6-001-hd-cp-rio6-001.html"> <span class="model-name">CP-RIO6-001</span> <span class="pages">(28 pages)</span> </a> </li> <li> <a href="/manuals/637829/kontron-cp-rio6-001-hd-vga.html"> <span class="model-name">CP-RIO6-001-HD-VGA</span> <span class="pages">(46 pages)</span> </a> </li> <li> <a href="/manuals/637830/kontron-cp-rio6-m.html"> <span class="model-name">CP-RIO6-M</span> <span class="pages">(20 pages)</span> </a> </li> <li> <a href="/manuals/637831/kontron-cp-rio6-a216-cp-rio6-a-cp-rio6-b216-cp-rio6-b.html"> <span class="model-name">CP-RIO6-B</span> <span class="pages">(28 pages)</span> </a> </li> <li> <a href="/manuals/637832/kontron-cp6925.html"> <span class="model-name">CP6925</span> <span class="pages">(42 pages)</span> </a> </li> <li> <a href="/manuals/637833/kontron-cp6002-uefi-bios.html"> <span class="model-name">CP6002 uEFI BIOS</span> <span class="pages">(76 pages)</span> </a> </li> <li> <a href="/manuals/637834/kontron-cp6002-ipmi.html"> <span class="model-name">CP6002 IPMI</span> <span class="pages">(40 pages)</span> </a> </li> <li> <a href="/manuals/637835/kontron-cp6002.html"> <span class="model-name">CP6002</span> <span class="pages">(42 pages)</span> </a> </li> </ul> </div> </div> </div> </div> </main></div><footer class="footer"> <div style="text-align: center; padding: 15px 0;" class="footer__content"><a style="color: white;" href="/sitemap/index.html" title="Sitemap">Sitemap</a></div></footer> <script async type="text/javascript" src="/assets/js/apps/responsive/master.min.js">