121 lines
4.9 KiB
HTML
121 lines
4.9 KiB
HTML
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<title>AVRDUDE: 5.2 Atmel DFU bootloader using FLIP version 1</title>
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<a name="Atmel-DFU-bootloader-using-FLIP-version-1"></a>
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<table class="header" cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="avrdude_16.html#Programmer-Specific-Information" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_17.html#Atmel-STK600" title="Previous section in reading order"> < </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_16.html#Programmer-Specific-Information" title="Up section"> Up </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_19.html#SerialUPDI-programmer" title="Next section in reading order"> > </a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_20.html#Platform-Dependent-Information" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left">[<a href="avrdude.html#Introduction" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="avrdude_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[Index]</td>
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<td valign="middle" align="left">[<a href="avrdude_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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</tr></table>
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<hr>
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<a name="Atmel-DFU-bootloader-using-FLIP-version-1-1"></a>
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<h2 class="section">5.2 Atmel DFU bootloader using FLIP version 1</h2>
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<p>Bootloaders using the FLIP protocol version 1 experience some very
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specific behaviour.
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</p>
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<p>These bootloaders have no option to access memory areas other than
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Flash and EEPROM.
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</p>
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<p>When the bootloader is started, it enters a <em>security mode</em> where
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the only acceptable access is to query the device configuration
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parameters (which are used for the signature on AVR devices). The
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only way to leave this mode is a <em>chip erase</em>. As a chip erase
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is normally implied by the ‘<samp>-U</samp>’ option when reprogramming the
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flash, this peculiarity might not be very obvious immediately.
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</p>
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<p>Sometimes, a bootloader with security mode already disabled seems to
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no longer respond with sensible configuration data, but only 0xFF for
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all queries. As these queries are used to obtain the equivalent of a
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signature, AVRDUDE can only continue in that situation by forcing the
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signature check to be overridden with the ‘<samp>-F</samp>’ option.
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</p>
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<p>A <em>chip erase</em> might leave the EEPROM unerased, at least on some
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versions of the bootloader.
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</p>
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<hr>
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<p>
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