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authorFrancis Rowe <info@gluglug.org.uk>2015-04-04 14:11:37 (EDT)
committer Francis Rowe <info@gluglug.org.uk>2015-04-04 14:11:37 (EDT)
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docs/install/bbb_setup.html: preliminary notes about EHCI debug
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@@ -327,6 +327,34 @@ Note: flashrom can never write if the flash chip isn't found automatically.
</p>
</div>
+
+ <div class="section">
+
+ <h1>EHCI debugging</h1>
+
+ <p>
+ Some libreboot systems lack serial ports, so you have to use the debug port (USB) instead.
+ The BeagleBone can be configured for this. It may involve compiling a patched kernel.
+ </p>
+
+ <p>
+ Work is in progress to implement this, and document it in libreboot. These are just some preliminary notes.
+ </p>
+
+ <p>
+ <a href="www.coreboot.org/EHCI_Debug_Port">www.coreboot.org/EHCI_Debug_Port</a>
+ <a href="www.coreboot.org/EHCI_Gadget_Debug">www.coreboot.org/EHCI_Gadget_Debug</a>
+ </p>
+
+<pre>
+from #coreboot
+&lt;tty0_&gt; stefanct, 1) plug the the BBB to a running system first and make sure you see it as "Netchip" (with lsusb). if that is correct (i.e you have BBB > ver1 ) , you have to rebuild coreboot/libreboot with Net20DB instead of BBB as debug dongle
+&lt;stefanct&gt; tty0_: the coreboot config is clear to me... it fails to show up in lsusb already
+&lt;tty0_&gt; on BBB, unload all the modules, then modprobe g_dbgp
+&lt;tty0_&gt; ... and when i siad lsusb, you do that on the target system, not on BBB
+</pre>
+
+ </div>
<div class="section">