<div dir="ltr"><span style="color:rgb(31,73,125);font-size:12.8px">> Current UEFI payload uses an generic emulated variable driver provided in EDK2 MdeModulePkg.</span><div><span style="color:rgb(31,73,125);font-size:12.8px"><br></span></div><div><span style="color:rgb(31,73,125);font-size:12.8px">Thank you for that info, Maurice. Was looking for this (right entry point) for very long time! :-)</span></div><div><span style="color:rgb(31,73,125);font-size:12.8px"><br></span></div><div><span style="color:rgb(31,73,125);font-size:12.8px">Zoran</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Mar 23, 2017 at 1:56 AM, Ma, Maurice <span dir="ltr"><<a href="mailto:maurice.ma@intel.com" target="_blank">maurice.ma@intel.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="color:#1f497d">Hi, Sibi</span><span lang="ZH-CN" style="font-family:宋体;color:#1f497d">，</span><span style="color:#1f497d"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Yes, UEFI payload follows the same way as standard UEFI FW on boot order handling. You will have to enable a NVRAM variable driver in order to maintain the boot options and order.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Current UEFI payload uses an generic emulated variable driver provided in EDK2 MdeModulePkg. With this driver, the variable will be lost after reboot since it is stored in memory.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">To store it in NVRAM, you will then need to develop or port a flash based variable driver, and then replace the emulated variable driver. This part is very platform and silicon specific.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Thanks<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Maurice<u></u><u></u></span></p>
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<p class="MsoNormal"><b>From:</b> Leahy, Leroy P <br>
<b>Sent:</b> Wednesday, March 22, 2017 4:51 PM<br>
<b>To:</b> <a href="mailto:Sibi.Rajasekaran@dell.com" target="_blank">Sibi.Rajasekaran@dell.com</a>; <a href="mailto:coreboot@coreboot.org" target="_blank">coreboot@coreboot.org</a>; Ma, Maurice <<a href="mailto:maurice.ma@intel.com" target="_blank">maurice.ma@intel.com</a>>; Agyeman, Prince <<a href="mailto:prince.agyeman@intel.com" target="_blank">prince.agyeman@intel.com</a>><br>
<b>Subject:</b> Re: Maintain boot order for multiple EFI based OS<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="color:#1f497d">Hi Maurice and Prince,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Would you please help answer the question below?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Hi Sibi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">The maintainers for the various EDK-II packages can be found in payloads/external/tianocore/<wbr>tianocore/Maintainers.txt. In your case, search for CorebootPayloadPkg.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="color:#1f497d">Lee Leahy<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><a name="m_-8064786629320179533______replyseparator"></a><b>From:</b> coreboot [<a href="mailto:coreboot-bounces@coreboot.org" target="_blank">mailto:coreboot-bounces@<wbr>coreboot.org</a>]
<b>On Behalf Of </b><a href="mailto:Sibi.Rajasekaran@dell.com" target="_blank">Sibi.Rajasekaran@dell.com</a><br>
<b>Sent:</b> Wednesday, March 22, 2017 6:20 AM<br>
<b>To:</b> <a href="mailto:coreboot@coreboot.org" target="_blank">coreboot@coreboot.org</a><br>
<b>Subject:</b> [coreboot] Maintain boot order for multiple EFI based OS<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#aaaaaa">Dell - Internal Use - Confidential
</span></b><span style="font-size:12.0pt"><u></u><u></u></span></p>
<p class="MsoNormal">Hi,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">We are using the coreboot project with Intel fsp to boot the Intel Rangeley based Mohonpeak CPU. We have built the Tianocore EDK2 project and used it as the payload to bring UEFI services to this bootloader. With this payload, we are able
to boot a EFI based OS successfully.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">As a next step, we are looking at installing multiple EFI OS and maintaining boot order among the OS.
<u></u><u></u></p>
<p class="MsoNormal">How is boot order maintained with UEFI payload? <u></u><u></u></p>
<p class="MsoNormal">Is it through EFI NVRAM variables? If so, does coreboot support NVRAM variables?
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Can you please point us in the right direction. <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal">Sibi<u></u><u></u></p>
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<br>--<br>
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