Beaglebone Black Boot explained

Beaglebone_Black_Boot_explained.svg

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<title>Beaglebone Black Boot explained</title>
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<text text-anchor="middle" x="581" y="-661.2" font-family="Times Roman,serif" font-size="12.00">Beaglebone Black Boot explained</text>
<text text-anchor="middle" x="581" y="-648.2" font-family="Times Roman,serif" font-size="12.00">(by Alexander Holler)</text>
<g id="graph2" class="cluster"><title>cluster_ROM</title>
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<text text-anchor="middle" x="191" y="-619.2" font-family="Times Roman,serif" font-size="12.00">ROM</text>
<text text-anchor="middle" x="191" y="-606.2" font-family="Times Roman,serif" font-size="12.00"> </text>
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<g id="graph4" class="cluster"><title>cluster_UBootSpl</title>
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<text text-anchor="middle" x="595" y="-615.2" font-family="Times Roman,serif" font-size="12.00">U&#45;Boot&#45;SPL (MLO)</text>
<text text-anchor="middle" x="595" y="-602.2" font-family="Times Roman,serif" font-size="12.00">(simplified)</text>
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<g id="graph5" class="cluster"><title>cluster_UBootImg</title>
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<text text-anchor="middle" x="985" y="-615.2" font-family="Times Roman,serif" font-size="12.00">U&#45;Boot</text>
<text text-anchor="middle" x="985" y="-602.2" font-family="Times Roman,serif" font-size="12.00"> </text>
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<!-- button -->
<g id="node2" class="node"><title>button</title>
<polygon fill="lightgrey" stroke="lightgrey" points="297,-592 169,-592 169,-548 297,-548 297,-592"/>
<text text-anchor="middle" x="233" y="-579" font-family="Times Roman,serif" font-size="10.00">Was boot button</text>
<text text-anchor="middle" x="233" y="-567" font-family="Times Roman,serif" font-size="10.00">pressed at power on?</text>
<text text-anchor="middle" x="233" y="-555" font-family="Times Roman,serif" font-size="10.00">(Reset is NOT power on!)</text>
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<!-- emmc -->
<g id="node3" class="node"><title>emmc</title>
<polygon fill="lightgrey" stroke="lightgrey" points="228,-477 126,-477 126,-433 228,-433 228,-477"/>
<text text-anchor="middle" x="177" y="-464" font-family="Times Roman,serif" font-size="10.00">MLO (U&#45;Boot&#45;SPL)</text>
<text text-anchor="middle" x="177" y="-452" font-family="Times Roman,serif" font-size="10.00">on eMMC (mmc1)</text>
<text text-anchor="middle" x="177" y="-440" font-family="Times Roman,serif" font-size="10.00">partition 1 (FAT)?</text>
</g>
<!-- button&#45;&gt;emmc -->
<g id="edge5" class="edge"><title>button&#45;&gt;emmc:n</title>
<path fill="none" stroke="red" d="M210.223,-547.757C196.657,-532.371 181.395,-510.516 177.792,-487.111"/>
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<text text-anchor="middle" x="204" y="-518.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- spi -->
<g id="node10" class="node"><title>spi</title>
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<text text-anchor="middle" x="288" y="-452" font-family="Times Roman,serif" font-size="10.00">SPI0 (eeprom)?</text>
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<!-- button&#45;&gt;spi -->
<g id="edge3" class="edge"><title>button&#45;&gt;spi:n</title>
<path fill="none" stroke="#00cd66" d="M254.422,-547.697C267.995,-531.455 283.647,-508.045 287.239,-483.292"/>
<polygon fill="#00cd66" stroke="#00cd66" points="290.753,-483.231 288,-473 283.772,-482.715 290.753,-483.231"/>
<text text-anchor="middle" x="284.5" y="-518.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- mmca -->
<g id="node4" class="node"><title>mmca</title>
<polygon fill="lightgrey" stroke="lightgrey" points="159,-327 57,-327 57,-283 159,-283 159,-327"/>
<text text-anchor="middle" x="108" y="-314" font-family="Times Roman,serif" font-size="10.00">MLO (U&#45;Boot&#45;SPL)</text>
<text text-anchor="middle" x="108" y="-302" font-family="Times Roman,serif" font-size="10.00">on MMC (mmc0)</text>
<text text-anchor="middle" x="108" y="-290" font-family="Times Roman,serif" font-size="10.00">partition 1 (FAT)?</text>
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<!-- emmc&#45;&gt;mmca -->
<g id="edge9" class="edge"><title>emmc&#45;&gt;mmca:n</title>
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<polygon fill="red" stroke="red" points="112.033,-336.797 108,-327 105.044,-337.174 112.033,-336.797"/>
<text text-anchor="middle" x="137" y="-369.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- spl -->
<g id="node11" class="node"><title>spl</title>
<polygon fill="lightgrey" stroke="lightgrey" points="272,-52 144,-52 144,-16 272,-16 272,-52"/>
<text text-anchor="middle" x="208" y="-37" font-family="Times Roman,serif" font-size="10.00">Load U&#45;Boot&#45;SPL (MLO)</text>
<text text-anchor="middle" x="208" y="-25" font-family="Times Roman,serif" font-size="10.00">into SRAM</text>
</g>
<!-- emmc&#45;&gt;spl -->
<g id="edge7" class="edge"><title>emmc&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" d="M176.037,-432.907C172.992,-360.54 164.321,-133.448 174,-102 180.732,-80.1283 200.654,-78.7363 206.42,-62.2102"/>
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<text text-anchor="middle" x="179.5" y="-201.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- uarta -->
<g id="node8" class="node"><title>uarta</title>
<polygon fill="lightgrey" stroke="lightgrey" points="122,-224 34,-224 34,-188 122,-188 122,-224"/>
<text text-anchor="middle" x="78" y="-203" font-family="Times Roman,serif" font-size="10.00">UART0 (serial)?</text>
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<!-- mmca&#45;&gt;uarta -->
<g id="edge13" class="edge"><title>mmca&#45;&gt;uarta:n</title>
<path fill="none" stroke="red" stroke-dasharray="5,2" d="M94.9288,-282.77C88.1708,-269.531 80.8816,-251.924 78.6718,-234.327"/>
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<text text-anchor="middle" x="92" y="-244.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- mmca&#45;&gt;spl -->
<g id="edge11" class="edge"><title>mmca&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" d="M115.318,-282.887C120.407,-266.734 126.976,-244.215 131,-224 137.727,-190.208 126.922,-96.452 149,-70 163.548,-52.5701 194.463,-70.4655 204.66,-61.5621"/>
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<!-- mmcb -->
<g id="node5" class="node"><title>mmcb</title>
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<text text-anchor="middle" x="277" y="-314" font-family="Times Roman,serif" font-size="10.00">MLO (U&#45;Boot&#45;SPL)</text>
<text text-anchor="middle" x="277" y="-302" font-family="Times Roman,serif" font-size="10.00">on MMC (mmc0)</text>
<text text-anchor="middle" x="277" y="-290" font-family="Times Roman,serif" font-size="10.00">partition 1 (FAT)?</text>
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<!-- usbb -->
<g id="node7" class="node"><title>usbb</title>
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<text text-anchor="middle" x="264" y="-203" font-family="Times Roman,serif" font-size="10.00">USB0?</text>
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<!-- mmcb&#45;&gt;usbb -->
<g id="edge29" class="edge"><title>mmcb&#45;&gt;usbb:n</title>
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<text text-anchor="middle" x="275" y="-244.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- mmcb&#45;&gt;spl -->
<g id="edge27" class="edge"><title>mmcb&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" d="M289.352,-282.896C309.443,-243.706 343.733,-160.654 310,-102 295.901,-77.4845 280.51,-82.208 255,-70 238.921,-62.3055 218.623,-69.6481 211.04,-61.6296"/>
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<text text-anchor="middle" x="334.5" y="-158.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- usba -->
<g id="node6" class="node"><title>usba</title>
<polygon fill="lightgrey" stroke="lightgrey" points="70,-138 16,-138 16,-102 70,-102 70,-138"/>
<text text-anchor="middle" x="43" y="-117" font-family="Times Roman,serif" font-size="10.00">USB0?</text>
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<!-- usba&#45;&gt;spl -->
<g id="edge19" class="edge"><title>usba&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" stroke-dasharray="5,2" d="M52.4332,-101.795C59.1486,-90.7482 69.2358,-77.3956 82,-70 103.223,-57.7035 182.391,-74.4677 203.046,-60.6923"/>
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<text text-anchor="middle" x="91.5" y="-72.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- failed -->
<g id="node12" class="node"><title>failed</title>
<polygon fill="lightgrey" stroke="lightgrey" points="102,-52 40,-52 40,-16 102,-16 102,-52"/>
<text text-anchor="middle" x="71" y="-31" font-family="Times Roman,serif" font-size="10.00">Boot failed</text>
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<!-- usba&#45;&gt;failed -->
<g id="edge21" class="edge"><title>usba&#45;&gt;failed:n</title>
<path fill="none" stroke="red" stroke-dasharray="5,2" d="M38.9454,-101.841C37.677,-91.8624 37.7589,-79.6 43,-70 47.6522,-61.4786 58.257,-62.7609 64.9981,-60.4682"/>
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<text text-anchor="middle" x="51" y="-72.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- uartb -->
<g id="node9" class="node"><title>uartb</title>
<polygon fill="lightgrey" stroke="lightgrey" points="271,-138 183,-138 183,-102 271,-102 271,-138"/>
<text text-anchor="middle" x="227" y="-117" font-family="Times Roman,serif" font-size="10.00">UART0 (serial)?</text>
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<!-- usbb&#45;&gt;uartb -->
<g id="edge33" class="edge"><title>usbb&#45;&gt;uartb:n</title>
<path fill="none" stroke="red" stroke-dasharray="5,2" d="M247.664,-187.798C239.61,-177.284 231.002,-163.225 228.058,-148.374"/>
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<!-- usbb&#45;&gt;spl -->
<g id="edge31" class="edge"><title>usbb&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" stroke-dasharray="5,2" d="M273.142,-187.662C282.549,-166.023 294.009,-129.511 280,-102 269.027,-80.4525 255.956,-83.6546 236,-70 227.797,-64.387 217.977,-64.8693 212.416,-61.3031"/>
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<!-- uarta&#45;&gt;usba -->
<g id="edge17" class="edge"><title>uarta&#45;&gt;usba:n</title>
<path fill="none" stroke="red" stroke-dasharray="5,2" d="M62.7503,-187.937C55.087,-177.358 46.8383,-163.188 44.0144,-148.346"/>
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<text text-anchor="middle" x="60" y="-158.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- uarta&#45;&gt;spl -->
<g id="edge15" class="edge"><title>uarta&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" stroke-dasharray="5,2" d="M80.5616,-187.547C85.7658,-157.62 100.54,-98.9401 139,-70 160.763,-53.6238 196.079,-75.5068 205.581,-61.8707"/>
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<text text-anchor="middle" x="119.5" y="-115.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- uartb&#45;&gt;spl -->
<g id="edge35" class="edge"><title>uartb&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" stroke-dasharray="5,2" d="M219.052,-101.911C214.863,-91.0584 210.259,-76.624 208.621,-62.3301"/>
<polygon fill="#00cd66" stroke="#00cd66" points="212.094,-61.772 208,-52 205.106,-62.1919 212.094,-61.772"/>
<text text-anchor="middle" x="222.5" y="-72.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- uartb&#45;&gt;failed -->
<g id="edge37" class="edge"><title>uartb&#45;&gt;failed:n</title>
<path fill="none" stroke="red" stroke-dasharray="5,2" d="M182.714,-101.832C146.863,-86.9967 99.2442,-66.9662 79.8166,-57.3421"/>
<polygon fill="red" stroke="red" points="81.3663,-54.1887 71,-52 77.7388,-60.1755 81.3663,-54.1887"/>
<text text-anchor="middle" x="148" y="-72.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- spi&#45;&gt;mmcb -->
<g id="edge25" class="edge"><title>spi&#45;&gt;mmcb:n</title>
<path fill="none" stroke="red" d="M285.449,-436.813C282.478,-414.164 277.879,-373.968 277.111,-337.248"/>
<polygon fill="red" stroke="red" points="280.608,-336.962 277,-327 273.608,-337.037 280.608,-336.962"/>
<text text-anchor="middle" x="289" y="-369.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- spi&#45;&gt;spl -->
<g id="edge23" class="edge"><title>spi&#45;&gt;spl:n</title>
<path fill="none" stroke="#00cd66" stroke-dasharray="5,2" d="M297.758,-436.662C309.393,-413.808 328.35,-373.214 337,-336 355.146,-257.932 365.832,-234.14 348,-156 337.097,-108.224 323.252,-91.0512 279,-70 253.507,-57.8728 218.835,-77.7234 210.075,-61.9806"/>
<polygon fill="#00cd66" stroke="#00cd66" points="213.463,-61.0779 208,-52 206.609,-62.5032 213.463,-61.0779"/>
<text text-anchor="middle" x="367.5" y="-201.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- spl2 -->
<g id="node33" class="node"><title>spl2</title>
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<text text-anchor="middle" x="595" y="-567" font-family="Times Roman,serif" font-size="10.00">MMC card present?</text>
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<!-- emmcu -->
<g id="node34" class="node"><title>emmcu</title>
<polygon fill="lightgrey" stroke="lightgrey" points="585.967,-437.247 585.967,-472.753 528.579,-497.861 447.421,-497.861 390.033,-472.753 390.033,-437.247 447.421,-412.139 528.579,-412.139 585.967,-437.247"/>
<text text-anchor="middle" x="488" y="-470" font-family="Times Roman,serif" font-size="10.00">Load U&#45;Boot (u&#45;boot.img)</text>
<text text-anchor="middle" x="488" y="-458" font-family="Times Roman,serif" font-size="10.00">from eMMC (mmc1)</text>
<text text-anchor="middle" x="488" y="-446" font-family="Times Roman,serif" font-size="10.00">partition 1 (FAT)</text>
<text text-anchor="middle" x="488" y="-434" font-family="Times Roman,serif" font-size="10.00">into DRAM</text>
</g>
<!-- spl2&#45;&gt;emmcu -->
<g id="edge43" class="edge"><title>spl2&#45;&gt;emmcu:n</title>
<path fill="none" stroke="red" d="M546.509,-557.443C521.516,-548.107 495.052,-532.66 489.192,-508.216"/>
<polygon fill="red" stroke="red" points="492.636,-507.527 488,-498 485.683,-508.338 492.636,-507.527"/>
<text text-anchor="middle" x="510" y="-518.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- mmcu -->
<g id="node35" class="node"><title>mmcu</title>
<polygon fill="lightgrey" stroke="lightgrey" points="799.967,-437.247 799.967,-472.753 742.579,-497.861 661.421,-497.861 604.033,-472.753 604.033,-437.247 661.421,-412.139 742.579,-412.139 799.967,-437.247"/>
<text text-anchor="middle" x="702" y="-470" font-family="Times Roman,serif" font-size="10.00">Load U&#45;Boot (u&#45;boot.img)</text>
<text text-anchor="middle" x="702" y="-458" font-family="Times Roman,serif" font-size="10.00">from MMC (mmc0)</text>
<text text-anchor="middle" x="702" y="-446" font-family="Times Roman,serif" font-size="10.00">partition 1 (FAT)</text>
<text text-anchor="middle" x="702" y="-434" font-family="Times Roman,serif" font-size="10.00">into DRAM</text>
</g>
<!-- spl2&#45;&gt;mmcu -->
<g id="edge41" class="edge"><title>spl2&#45;&gt;mmcu:n</title>
<path fill="none" stroke="#00cd66" d="M643.491,-557.443C668.484,-548.107 694.948,-532.66 700.808,-508.216"/>
<polygon fill="#00cd66" stroke="#00cd66" points="704.317,-508.338 702,-498 697.364,-507.527 704.317,-508.338"/>
<text text-anchor="middle" x="707.5" y="-518.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
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<!-- uboot -->
<g id="node39" class="node"><title>uboot</title>
<ellipse fill="lightgrey" stroke="lightgrey" cx="983" cy="-570" rx="62.0388" ry="18"/>
<text text-anchor="middle" x="983" y="-567" font-family="Times Roman,serif" font-size="10.00">MMC card present?</text>
</g>
<!-- emmce -->
<g id="node40" class="node"><title>emmce</title>
<ellipse fill="lightgrey" stroke="lightgrey" cx="903" cy="-455" rx="70.9184" ry="31.1127"/>
<text text-anchor="middle" x="903" y="-464" font-family="Times Roman,serif" font-size="10.00">Load uEnv.txt from</text>
<text text-anchor="middle" x="903" y="-452" font-family="Times Roman,serif" font-size="10.00">eMMC (mmc1)</text>
<text text-anchor="middle" x="903" y="-440" font-family="Times Roman,serif" font-size="10.00">partition 1</text>
</g>
<!-- uboot&#45;&gt;emmce -->
<g id="edge48" class="edge"><title>uboot&#45;&gt;emmce:n</title>
<path fill="none" stroke="red" d="M952.755,-553.97C932.756,-541.231 909.291,-521.397 904.066,-496.278"/>
<polygon fill="red" stroke="red" points="907.513,-495.586 903,-486 900.55,-496.308 907.513,-495.586"/>
<text text-anchor="middle" x="930" y="-518.7" font-family="Times Roman,serif" font-size="12.00">No</text>
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<!-- mmce -->
<g id="node41" class="node"><title>mmce</title>
<ellipse fill="lightgrey" stroke="lightgrey" cx="1068" cy="-455" rx="70.9184" ry="31.1127"/>
<text text-anchor="middle" x="1068" y="-464" font-family="Times Roman,serif" font-size="10.00">Load uEnv.txt from</text>
<text text-anchor="middle" x="1068" y="-452" font-family="Times Roman,serif" font-size="10.00">MMC (mmc0)</text>
<text text-anchor="middle" x="1068" y="-440" font-family="Times Roman,serif" font-size="10.00">partition 1</text>
</g>
<!-- uboot&#45;&gt;mmce -->
<g id="edge46" class="edge"><title>uboot&#45;&gt;mmce:n</title>
<path fill="none" stroke="#00cd66" d="M1015.13,-554.445C1036.48,-541.9 1061.54,-522.093 1066.94,-496.213"/>
<polygon fill="#00cd66" stroke="#00cd66" points="1070.45,-496.308 1068,-486 1063.49,-495.585 1070.45,-496.308"/>
<text text-anchor="middle" x="1066.5" y="-518.7" font-family="Times Roman,serif" font-size="12.00">Yes</text>
</g>
<!-- kernelemmc -->
<g id="node43" class="node"><title>kernelemmc</title>
<ellipse fill="lightgrey" stroke="lightgrey" cx="900" cy="-305" rx="75.8684" ry="31.1127"/>
<text text-anchor="middle" x="900" y="-314" font-family="Times Roman,serif" font-size="10.00">Load dtb and uImage</text>
<text text-anchor="middle" x="900" y="-302" font-family="Times Roman,serif" font-size="10.00">(kernel) from eMMC</text>
<text text-anchor="middle" x="900" y="-290" font-family="Times Roman,serif" font-size="10.00">partition 2 (/boot)</text>
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<text text-anchor="middle" x="1070" y="-302" font-family="Times Roman,serif" font-size="10.00">(kernel) from MMC</text>
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