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A Wikiful of Hacks: Hacks.Wiki is an experiment to organise quick hacks, notes, bookmarks and tools into an easy-to-build-and-maintain “Digital Garden”.
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  1. <!DOCTYPE html>
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  8.     <title>👢 Detect UEFI or BIOS | Hacks.Wiki - Today I Learned...</title>
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  12.     <meta property="og:description" content="Here is how you can detect if you ve booted your computer using a UEFI BIOS or a Legacy BIOS. First, install the dmidecode utility from your operating system repository. On Debian, you can : dmidecod" />
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  18.     <meta name="twitter:description" content="Here is how you can detect if you ve booted your computer using a UEFI BIOS or a Legacy BIOS. First, install the dmidecode utility from your operating system repository. On Debian, you can : dmidecod" />
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  51. <div dir="auto" class="title is-1 has-text-weight-bold">👢 Detect UEFI or BIOS</div>
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  63.       <span>Tuesday 28 February 2023</span>
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  66.       <span>5 versions</span>
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  77.   
  78.   <p dir="auto">Here is how you can detect if you&rsquo;ve booted your computer using a UEFI BIOS or a Legacy BIOS. First, install the <code>dmidecode</code> utility from your operating system repository. On Debian, you can:</p>
  79. <pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;"><code><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>apt-get install dmidecode
  80. </span></span></code></pre><p dir="auto"><code>dmidecode</code> reports information related to the BIOS under a <em>type 0</em> entry. A quick way to detect the BIOS mode is:</p>
  81. <pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;"><code><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>sudo dmidecode -t <span style="color:#bd93f9">0</span> | grep UEFI &gt; /dev/null <span style="color:#ff79c6">&amp;&amp;</span> <span style="color:#8be9fd;font-style:italic">echo</span> UEFI <span style="color:#ff79c6">||</span> <span style="color:#8be9fd;font-style:italic">echo</span> BIOS
  82. </span></span></code></pre><p dir="auto">On a (Legacy) BIOS system you would see:</p>
  83. <pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;"><code><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span>$ sudo dmidecode -t <span style="color:#bd93f9">0</span>
  84. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 2</span><span><span style="color:#6272a4"># dmidecode 3.4</span>
  85. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 3</span><span>Getting SMBIOS data from sysfs.
  86. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 4</span><span>SMBIOS 3.0.0 present.
  87. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 5</span><span>
  88. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 6</span><span>Handle 0x0000, DMI <span style="color:#8be9fd;font-style:italic">type</span> 0, <span style="color:#bd93f9">26</span> bytes
  89. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 7</span><span>BIOS Information
  90. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 8</span><span>        Vendor: 3mdeb
  91. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 9</span><span>        Version: Dasharo <span style="color:#ff79c6">(</span>coreboot+SeaBIOS<span style="color:#ff79c6">)</span> 
  92. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">10</span><span>        Release Date: 08/23/2022
  93. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">11</span><span>        ROM Size: <span style="color:#bd93f9">12</span> MB
  94. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">12</span><span>        Characteristics:
  95. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">13</span><span>                PCI is supported
  96. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">14</span><span>                PC Card <span style="color:#ff79c6">(</span>PCMCIA<span style="color:#ff79c6">)</span> is supported
  97. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">15</span><span>                BIOS is upgradeable
  98. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">16</span><span>                Selectable boot is supported
  99. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">17</span><span>                ACPI is supported
  100. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">18</span><span>                Targeted content distribution is supported
  101. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">19</span><span>        BIOS Revision: 0.0
  102. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">20</span><span>        Firmware Revision: 0.0
  103. </span></span></code></pre><p dir="auto">On a UEFI system you would see:</p>
  104. <pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;"><code><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1</span><span>$ sudo dmidecode -t <span style="color:#bd93f9">0</span>
  105. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 2</span><span><span style="color:#6272a4"># dmidecode 3.4</span>
  106. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 3</span><span>Getting SMBIOS data from sysfs.
  107. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 4</span><span>SMBIOS 3.1.1 present.
  108. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 5</span><span>
  109. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 6</span><span>Handle 0x0000, DMI <span style="color:#8be9fd;font-style:italic">type</span> 0, <span style="color:#bd93f9">26</span> bytes
  110. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 7</span><span>BIOS Information
  111. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 8</span><span>        Vendor: American Megatrends Inc.
  112. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 9</span><span>        Version: <span style="color:#bd93f9">2202</span>
  113. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">10</span><span>        Release Date: 07/14/2020
  114. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">11</span><span>        Address: 0xF0000
  115. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">12</span><span>        Runtime Size: <span style="color:#bd93f9">64</span> kB
  116. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">13</span><span>        ROM Size: <span style="color:#bd93f9">16</span> MB
  117. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">14</span><span>        Characteristics:
  118. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">15</span><span>                PCI is supported
  119. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">16</span><span>                APM is supported
  120. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">17</span><span>                BIOS is upgradeable
  121. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">18</span><span>                BIOS shadowing is allowed
  122. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">19</span><span>                Boot from CD is supported
  123. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">20</span><span>                Selectable boot is supported
  124. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">21</span><span>                BIOS ROM is socketed
  125. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">22</span><span>                EDD is supported
  126. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">23</span><span>                Print screen service is supported <span style="color:#ff79c6">(</span>int 5h<span style="color:#ff79c6">)</span>
  127. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">24</span><span>                <span style="color:#bd93f9">8042</span> keyboard services are supported <span style="color:#ff79c6">(</span>int 9h<span style="color:#ff79c6">)</span>
  128. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">25</span><span>                Serial services are supported <span style="color:#ff79c6">(</span>int 14h<span style="color:#ff79c6">)</span>
  129. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">26</span><span>                Printer services are supported <span style="color:#ff79c6">(</span>int 17h<span style="color:#ff79c6">)</span>
  130. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">27</span><span>                ACPI is supported
  131. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">28</span><span>                USB legacy is supported
  132. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">29</span><span>                BIOS boot specification is supported
  133. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">30</span><span>                Targeted content distribution is supported
  134. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">31</span><span>                UEFI is supported
  135. </span></span><span style="display:flex;"><span style="white-space:pre;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">32</span><span>        BIOS Revision: 5.13
  136. </span></span></code></pre><p dir="auto"><a href="/+/tag/uefi" class="tag is-info is-light">#uefi</a> <a href="/+/tag/seabios" class="tag is-info is-light">#seabios</a> <a href="/+/tag/coreboot" class="tag is-info is-light">#coreboot</a> <a href="/+/tag/bios" class="tag is-info is-light">#bios</a> &#x1f462;</p>
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  144.     <a href="/Migrate%20from%20UEFI%20to%20%28Legacy%29%20BIOS" dir="auto">🔁 Migrate from UEFI to (Legacy) BIOS</a> <time class="has-text-grey is-size-7">Tuesday 28 February 2023</time>
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