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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Samuel,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I remember talking about this with Matt Horsnell from ARM some time ago, though I’m not sure if they’ve had a chance to look at BF-on-ARM yet.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The “molly” tool is used to wrap up the kernel and modules into a single bootable image. I wrote it because x64 gem5 was quite tailored to Linux, and expected
to load a single kernel passed on the simulator’s command line. I think that, for Linux, that kernel would proceed to load modules from a hard disk attached to the simulated machine.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The two initial things I’d suggest investigating are:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Checking what methods gem5 supports for loading kernels and modules on ARM. E.g., when booting Linux, then where do things come from?<br>
<br>
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Checking that the kinds of ARM system that gem5 can model fit with the kinds of ARM system supported by BF.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">It may also be worth checking whether QEMU supports the same kind of ARM system that you wish to model. If so, then you could start off using QEMU (for a faster
debugging cycle), and then switch over to gem5 later. Also, I’d suggest getting a simple non-heterogenous system booting and running first, before starting on the more complex big.LITTLE setting.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Tim<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Samuel Hitz [mailto:samuel.hitz@gmail.com]
<br>
<b>Sent:</b> 27 February 2012 13:01<br>
<b>To:</b> Tim Harris (RESEARCH)<br>
<b>Cc:</b> barrelfish-users@lists.inf.ethz.ch<br>
<b>Subject:</b> Fwd: building an arm kernel of barrelfish for gem5<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">CCing the public barrelfish list.<o:p></o:p></p>
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<p class="MsoNormal">---------- Forwarded message ----------<br>
From: <b>Samuel Hitz</b> <<a href="mailto:samuel.hitz@gmail.com">samuel.hitz@gmail.com</a>><br>
Date: Mon, Feb 27, 2012 at 9:21 AM<br>
Subject: building an arm kernel of barrelfish for gem5<br>
To: <a href="mailto:tharris@microsoft.com">tharris@microsoft.com</a><br>
<br>
<br>
Hi Tim,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm a CS student at ETH Zurich and for my Bachelor Thesis, I try to port Barrelfish to a heterogeneous ARM multicore system (big.LITTLE) using the gem5 simulator. Now the first step is to build a Barrelfish kernel suitable for the use with
gem5. I saw on the wiki, that you did this already for x86. Now my question is, what must be modified in the build process to get an ARM kernel for gem5?<o:p></o:p></p>
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<p class="MsoNormal">I saw you're using 'molly' in order to build the kernel. How is this applicable to build an ARM kernel for gem5? What do I have to rewrite? Or is it just a matter of building an ARM Barrelfish tree and run 'make m5_kernel'?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you for your help.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Samuel<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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