<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Regarding the power control related, sugest to check on the
below:</p>
<p><a
href="https://github.com/openbmc/x86-power-control/blob/master/power-control-x86/src/power_control.cpp">https://github.com/openbmc/x86-power-control/blob/master/power-control-x86/src/power_control.cpp</a></p>
<p><br>
</p>
<p><br>
</p>
<p>It uses litter systems related services/targets, and monitor
these gpio signals, to trigger different callback actions.<br>
</p>
<p><br>
</p>
<p>For the pgood_wait, it is in:</p>
<p> <a
href="https://github.com/openbmc/skeleton/tree/master/op-pwrctl/pgood_wait">https://github.com/openbmc/skeleton/tree/master/op-pwrctl/pgood_wait</a></p>
<p><a
href="https://github.com/openbmc/skeleton/tree/master/op-pwrctl">https://github.com/openbmc/skeleton/tree/master/op-pwrctl</a></p>
<p><br>
</p>
<p>Thanks,</p>
<p>Yong<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">在 4/21/2020 10:50 PM,
<a class="moz-txt-link-abbreviated" href="mailto:zhouyuanqing8@outlook.com">zhouyuanqing8@outlook.com</a> 写道:<br>
</div>
<blockquote type="cite"
cite="mid:PS2PR04MB383294A0D7402F9204C46C97FED50@PS2PR04MB3832.apcprd04.prod.outlook.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
Hi </div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
This is a very good idea. As the first time to do openbmc, I
look forward to it. Currently, I am being troubled by the
problems you describe.<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
The following questions, please also help you answer it,
thank you very much.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
1.I modified the dts file, how to use the command "bitbake
-f linux-aspeed" to Generate fitimage and dub？</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
Now, I modify the dts file in the kernel source directory.
When I compile, bitbake will re-fetch the source code,
decompress, patch, configure, and compile, causing my changes to
be overwritten. I currently use manual call scripts to compile
dts files and make images for debugging.Is there a way to make
bitbake skip the previous steps and compile directly？</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
2.The size of image-rwfs is 0, I want to use rwfs
debugging, how to configure to generate a normal image-rwfs? </div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<span>-rw-r--r--. 2 harleyzhou harleyzhou 9443
4月 7 17:27
obmc-phosphor-image-xxh-20200407092558.rootfs.manifest<br>
</span>
<div> -rw-r--r--. 2 harleyzhou harleyzhou 18214912
4月 7 17:27 obmc-phosphor-image-<span style="caret-color:
rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica,
sans-serif; background-color: rgb(255, 255, 255); display:
inline !important">xxh</span>-20200407092558.rootfs.squashfs-xz<br>
</div>
<div> -rw-rw-r--. 2 harleyzhou harleyzhou 33554432 4月
7 17:27 obmc-phosphor-image-<span style="caret-color: rgb(0,
0, 0); font-family: Calibri, Arial, Helvetica, sans-serif;
background-color: rgb(255, 255, 255); display: inline
!important">xxh</span>-20200407092558.static.mtd<br>
</div>
<div> -rw-rw-r--. 2 harleyzhou harleyzhou 33566720 4月
7 17:28 obmc-phosphor-image-<span style="caret-color: rgb(0,
0, 0); font-family: Calibri, Arial, Helvetica, sans-serif;
background-color: rgb(255, 255, 255); display: inline
!important">xxh</span>-20200407092558.static.mtd.all.tar<br>
</div>
<div> -rw-rw-r--. 2 harleyzhou harleyzhou 22384640 4月
7 17:28 obmc-phosphor-image-<span style="caret-color: rgb(0,
0, 0); font-family: Calibri, Arial, Helvetica, sans-serif;
background-color: rgb(255, 255, 255); display: inline
!important">xxh</span>-20200407092558.static.mtd.tar<br>
</div>
<div> -rw-r--r--. 2 harleyzhou harleyzhou 308218
4月 7 17:27 obmc-phosphor-image-<span style="caret-color:
rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica,
sans-serif; background-color: rgb(255, 255, 255); display:
inline !important">xxh</span>-20200407092558.testdata.json<br>
</div>
<div> -rw-r--r--. 2 harleyzhou harleyzhou 0
<span style="background-color: rgb(0, 255, 0);"> 4月 7
17:27 obmc-phosphor-image-</span><span style="caret-color:
rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica,
sans-serif; background-color: rgb(0, 255, 0); display:
inline !important;">xxh</span><span style="background-color:
rgb(0, 255, 0);">.jffs2</span><br>
</div>
<span></span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
3. I did not find the source code of "pgood_wait" and
"power_control.exe" in obmc-op-control-power? where can I get it
?</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
4.<span style="caret-color: rgb(36, 41, 46); color: rgb(36,
41, 46); font-family: -apple-system, BlinkMacSystemFont,
"Segoe UI", Helvetica, Arial, sans-serif,
"Apple Color Emoji", "Segoe UI Emoji";
background-color: rgb(255, 255, 255); display: inline
!important">OpenBMC uses<span> </span></span><a
href="https://www.freedesktop.org/wiki/Software/systemd/"
rel="nofollow" style="box-sizing: border-box; color: rgb(3,
102, 214); font-family: -apple-system, BlinkMacSystemFont,
"Segoe UI", Helvetica, Arial, sans-serif,
"Apple Color Emoji", "Segoe UI Emoji""
moz-do-not-send="true">systemd</a><span style="caret-color:
rgb(36, 41, 46); color: rgb(36, 41, 46); font-family:
-apple-system, BlinkMacSystemFont, "Segoe UI",
Helvetica, Arial, sans-serif, "Apple Color Emoji",
"Segoe UI Emoji"; background-color: rgb(255, 255,
255); display: inline !important"><span> </span>to manage all
processes, So i analyzed the process of systemd starting
process and saw "default.target-> basic.target->
sysinit.target-> local-fs.target", there is no content
behind.please help to provide clues of systemd starting
process.</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color: rgb(36, 41, 46); color: rgb(36, 41,
46); font-family: -apple-system, BlinkMacSystemFont,
"Segoe UI", Helvetica, Arial, sans-serif,
"Apple Color Emoji", "Segoe UI Emoji";
background-color: rgb(255, 255, 255); display: inline
!important"><br>
</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color: rgb(36, 41, 46); color: rgb(36, 41,
46); font-family: -apple-system, BlinkMacSystemFont,
"Segoe UI", Helvetica, Arial, sans-serif,
"Apple Color Emoji", "Segoe UI Emoji";
background-color: rgb(255, 255, 255); display: inline
!important"> 5.I understand the following execution process
of power-on , help check if it is correct.</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
a).rest or busctl send power-on commands to systemd
through d-bus messages.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
b).systemd find the <span style="caret-color: rgb(36,
41, 46); color: rgb(36, 41, 46); font-family: "PingFang
SC"; font-size: 12px; background-color: rgb(255, 255,
255); display: inline !important">
<a class="moz-txt-link-abbreviated" href="mailto:obmc-chassis-poweron@.target">obmc-chassis-poweron@.target</a></span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color: rgb(36, 41, 46); color: rgb(36, 41,
46); font-family: "PingFang SC"; font-size: 12px;
background-color: rgb(255, 255, 255); display: inline
!important">
<span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px; background-color: rgb(255, 255, 255);
display: inline !important">
c).systemd find the <span style="caret-color: rgb(36, 41,
46); color: rgb(36, 41, 46); font-family: "PingFang
SC"; font-size: 12px; background-color: rgb(255, 255,
255); display: inline !important"><a class="moz-txt-link-abbreviated" href="mailto:obmc-power-start@.target">obmc-power-start@.target</a></span></span></span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color: rgb(36, 41, 46); color: rgb(36, 41,
46); font-family: "PingFang SC"; font-size: 12px;
background-color: rgb(255, 255, 255); display: inline
!important"><span style="caret-color: rgb(0, 0, 0); color:
rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica,
sans-serif; font-size: 16px; background-color: rgb(255, 255,
255); display: inline !important"><span style="caret-color:
rgb(36, 41, 46); color: rgb(36, 41, 46); font-family:
"PingFang SC"; font-size: 12px;
background-color: rgb(255, 255, 255); display: inline
!important"> <span style="caret-color: rgb(0, 0,
0); color: rgb(0, 0, 0); font-family: Calibri, Arial,
Helvetica, sans-serif; font-size: 16px;
background-color: rgb(255, 255, 255); display: inline
!important">
d</span><span style="caret-color: rgb(0, 0, 0); color:
rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica,
sans-serif; font-size: 16px; background-color: rgb(255,
255, 255); display: inline !important">).systemd find
the <span style="caret-color: rgb(36, 41, 46); color:
rgb(36, 41, 46); font-family: "PingFang SC";
font-size: 12px; background-color: rgb(255, 255, 255);
display: inline !important"><a class="moz-txt-link-abbreviated" href="mailto:op-power-start@0.service">op-power-start@0.service</a></span><span
style="margin: 0px; font-family: "PingFang
SC"; font-size: 12px; color: rgb(36, 41, 46);
caret-color: rgb(36, 41, 46)"> </span></span></span></span></span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color: rgb(36, 41, 46); color: rgb(36, 41,
46); font-family: "PingFang SC"; font-size: 12px;
background-color: rgb(255, 255, 255); display: inline
!important"><span style="caret-color: rgb(0, 0, 0); color:
rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica,
sans-serif; font-size: 16px; background-color: rgb(255, 255,
255); display: inline !important"><span style="caret-color:
rgb(36, 41, 46); color: rgb(36, 41, 46); font-family:
"PingFang SC"; font-size: 12px;
background-color: rgb(255, 255, 255); display: inline
!important"><span style="caret-color: rgb(0, 0, 0); color:
rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica,
sans-serif; font-size: 16px; background-color: rgb(255,
255, 255); display: inline !important"><span
style="margin: 0px; font-family: "PingFang
SC"; font-size: 12px; color: rgb(36, 41, 46);
caret-color: rgb(36, 41, 46)"> <span
style="margin: 0px; font-family: Calibri, Arial,
Helvetica, sans-serif; font-size: 16px; color:
rgb(0, 0, 0); background-color: rgb(255, 255, 255);
caret-color: rgb(0, 0, 0); display: inline
!important">e</span><span style="margin: 0px;
font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px; color: rgb(0, 0, 0);
background-color: rgb(255, 255, 255); caret-color:
rgb(0, 0, 0); display: inline !important">).<span
style="caret-color: rgb(0, 0, 0); font-family:
Calibri, Arial, Helvetica, sans-serif;
background-color: rgb(255, 255, 255); display:
inline !important">systemd start a thread and
execute "<span style="caret-color: rgb(36, 41,
46); color: rgb(36, 41, 46); font-family:
"PingFang SC"; font-size: 12px;
background-color: rgb(255, 255, 255); display:
inline !important">busctl call `mapper
get-service /org/openbmc/control/power%i`
/org/openbmc/control/power%i
org.openbmc.control.Power setPowerState I 1"</span></span></span></span></span></span></span></span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
appendix：<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color: rgb(36, 41, 46); color: rgb(36, 41,
46); font-family: -apple-system, BlinkMacSystemFont,
"Segoe UI", Helvetica, Arial, sans-serif,
"Apple Color Emoji", "Segoe UI Emoji";
background-color: rgb(255, 255, 255); display: inline
!important">
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">ls <a class="moz-txt-link-abbreviated" href="mailto:obmc-chassis-poweron@0.target.requires">obmc-chassis-poweron@0.target.requires</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:op-power-start@0.service">op-power-start@0.service</a><span>
</span><a class="moz-txt-link-abbreviated" href="mailto:op-wait-power-on@0.service">op-wait-power-on@0.service</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'; min-height: 17.0px">
<br>
</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">cat <a class="moz-txt-link-abbreviated" href="mailto:obmc-chassis-poweron@.target">obmc-chassis-poweron@.target</a><span> </span></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">[Unit]</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">Description=Chassis%i (Power On)</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">Wants=multi-user.target</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">After=multi-user.target</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:Wants=mapper-wait@-xyz-openbmc_project-state-chassis%i.service">Wants=mapper-wait@-xyz-openbmc_project-state-chassis%i.service</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:After=mapper-wait@-xyz-openbmc_project-state-chassis%i.service">After=mapper-wait@-xyz-openbmc_project-state-chassis%i.service</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:Wants=mapper-subtree-remove@-xyz-openbmc\x5fproject-software\x3Axyz.openbmc_project.Software.ActivationBlocksTransition.service">Wants=mapper-subtree-remove@-xyz-openbmc\x5fproject-software\x3Axyz.openbmc_project.Software.ActivationBlocksTransition.service</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:After=mapper-subtree-remove@-xyz-openbmc\x5fproject-software\x3Axyz.openbmc_project.Software.ActivationBlocksTransition.service">After=mapper-subtree-remove@-xyz-openbmc\x5fproject-software\x3Axyz.openbmc_project.Software.ActivationBlocksTransition.service</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'; min-height: 17.0px">
<br>
</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">cat <a class="moz-txt-link-abbreviated" href="mailto:op-power-start@0.service">op-power-start@0.service</a><span> </span></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">[Unit]</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">Description=Start Power%i</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:Wants=obmc-power-start@%i.target">Wants=obmc-power-start@%i.target</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:Before=obmc-power-start@%i.target">Before=obmc-power-start@%i.target</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:After=obmc-power-start-pre@%i.target">After=obmc-power-start-pre@%i.target</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">After=obmc-fan-control.target</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:Wants=mapper-wait@-org-openbmc-control-power%i.service">Wants=mapper-wait@-org-openbmc-control-power%i.service</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:After=mapper-wait@-org-openbmc-control-power%i.service">After=mapper-wait@-org-openbmc-control-power%i.service</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">[Service]</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">RemainAfterExit=yes</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">Type=oneshot</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">ExecStart=/bin/sh -c "busctl call `mapper
get-service /org/openbmc/control/power%i`
/org/openbmc/control/power%i org.openbmc.control.Power
setPowerState i 1"</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">SyslogIdentifier=op-power-start</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">[Install]</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:WantedBy=obmc-host-start@%i.target">WantedBy=obmc-host-start@%i.target</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'; min-height: 17.0px">
<br>
</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">cat <a class="moz-txt-link-abbreviated" href="mailto:obmc-power-start@.target">obmc-power-start@.target</a><span> </span></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">[Unit]</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">Description=Power%i On</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:After=obmc-power-start-pre@%i.target">After=obmc-power-start-pre@%i.target</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">Wants=multi-user.target</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'"><a class="moz-txt-link-abbreviated" href="mailto:Conflicts=obmc-chassis-poweroff@%i.target">Conflicts=obmc-chassis-poweroff@%i.target</a></p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">RefuseManualStart=yes</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px
'PingFang SC'">RefuseManualStop=yes</p>
<br>
</span></div>
<div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<span style="caret-color: rgb(50, 49, 48); color: rgb(50, 49,
48); font-family: DengXian; text-align: justify;
background-color: rgb(255, 255, 255); display: inline
!important">Thanks</span><br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0)">
<span style="caret-color: rgb(50, 49, 48); color: rgb(50, 49,
48); font-family: DengXian; text-align: justify;
background-color: rgb(255, 255, 255); display: inline
!important">Harley</span></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>发件人:</b>
openbmc
<a class="moz-txt-link-rfc2396E" href="mailto:openbmc-bounces+zhouyuanqing8=outlook.com@lists.ozlabs.org"><openbmc-bounces+zhouyuanqing8=outlook.com@lists.ozlabs.org></a>
代表 Sui Chen <a class="moz-txt-link-rfc2396E" href="mailto:suichen6@gmail.com"><suichen6@gmail.com></a><br>
<b>发送时间:</b> 2020年4月21日 1:05<br>
<b>收件人:</b> <a class="moz-txt-link-abbreviated" href="mailto:openbmc@lists.ozlabs.org">openbmc@lists.ozlabs.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:openbmc@lists.ozlabs.org"><openbmc@lists.ozlabs.org></a><br>
<b>主题:</b> Re: Call for Gardening Tasks</font>
<div> </div>
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<div lang="ZH-CN">
<div class="x_WordSection1">
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span lang="EN-US">> On Apr 11, 2020, at 8:15 AM,
Andrew Geissler <geissonator at gmail.com> wrote:</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span lang="EN-US">> Systemd Visualization</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span lang="EN-US">> Another complicated area of
OpenBMC is our systemd targets and services. Building on
the upstream tools to visualize our systemd targets and
services would be useful to new people.</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US"> </span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US">+1 to
visualization, and I have a few thoughts on this ---</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US">My lacking a
mental model of how an OpenBMC system works had been my
pain point in the first few months working with OpenBMC
(I’m a bit new to this area), so after learning the
minimal set of survival skills I did something similar
to what you mentioned – visualizing the messages passed
between different dbus peers (and conveniently, IPMI
traffic, as IPMI-related dbus messages exposing all IPMI
payload comprise most of the dbus traffic on that
particular system I was working on.)</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US"> </span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US">I think packet
analysis tools such as Wireshark and graphics frame
analysis tools such as RenderDoc, or system event-based
Windows Performance tool like GPUView provide great
examples of what people might expect to achieve with a
visualization tool: capture, inspect and (sometimes)
playback, across multiple layers in the
software/hardware stack. Many similar existing tools
process sequences of events, and in this case of BMCs,
the events could be dbus messages. I found a prototype
visualizer made at work greatly helpful in explaining to
new team members some basic concepts and the IPMI stack
on the BMC.</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US"> </span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US">The IPMI stack
is interesting because it’s one noticeable workload on
the particular BMC system I had been working on; in my
current limited understanding, having lots of I/O
capability to connect to hundreds of sensors is one of
the many features that set apart a BMC chip and a
similarly powerful smartphone chip, and the broad use of
dbus is what sets apart OpenBMC and the desktop Linux
distro I had been using. I heard optimization is best
done workload by workload, perhaps this rationale
applies to visualization too?</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US"> </span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US">I realize I
was mostly talking about visualizing the run-time state
of the system rather than build-time, but we could
visualize the run-time aspect of systemd units too since
I have seen many times a dbus message eventually
triggering a systemd target to acutate the system, so it
would be good to consider both dbus and systemd (and
maybe other parts of the system?) to have a more
holistic view of the BMC’s operations.</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US"> </span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US">Thanks</span></p>
<p class="x_MsoNormal" style="margin: 0cm 0cm 0.0001pt;
text-align: justify; font-size: 10.5pt; font-family:
DengXian;">
<span style="font-size:12.0pt" lang="EN-US">Sui</span></p>
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