[bootlin/training-materials updates] master: Boot time slides: misc updates (beb10278)
Michael Opdenacker
michael.opdenacker at bootlin.com
Tue May 3 16:38:45 CEST 2022
Repository : https://github.com/bootlin/training-materials
On branch : master
Link : https://github.com/bootlin/training-materials/commit/beb102783fcdef0dfbc74d2778349c22d02866e7
>---------------------------------------------------------------
commit beb102783fcdef0dfbc74d2778349c22d02866e7
Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
Date: Tue May 3 16:38:45 2022 +0200
Boot time slides: misc updates
- Fix descriptions of labs
- Fix Falcon mode savings on BeagleBone Black, better than before
Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>
>---------------------------------------------------------------
beb102783fcdef0dfbc74d2778349c22d02866e7
mk/boot-time.mk | 1 -
.../boot-time-bootloader-lab.tex | 9 -
slides/boot-time-conclusions/best-techniques.svg | 239 +++++++++++----------
slides/boot-time-kernel/boot-time-kernel.tex | 4 +-
.../boot-time-u-boot-falcon-mode.tex | 12 +-
5 files changed, 131 insertions(+), 134 deletions(-)
diff --git a/mk/boot-time.mk b/mk/boot-time.mk
index 2b6aa9e8..6b9ea2c2 100644
--- a/mk/boot-time.mk
+++ b/mk/boot-time.mk
@@ -24,7 +24,6 @@ BOOT_TIME_SLIDES = \
boot-time-kernel \
boot-time-bootloader \
boot-time-u-boot-falcon-mode \
- boot-time-bootloader-lab \
boot-time-hardware-init \
boot-time-conclusions \
boot-time-references \
diff --git a/slides/boot-time-bootloader-lab/boot-time-bootloader-lab.tex b/slides/boot-time-bootloader-lab/boot-time-bootloader-lab.tex
deleted file mode 100644
index 1ca74a89..00000000
--- a/slides/boot-time-bootloader-lab/boot-time-bootloader-lab.tex
+++ /dev/null
@@ -1,9 +0,0 @@
-\setuplabframe
-{Reduce bootloader time}
-{
-\begin{itemize}
-\item Reduce boot time by compiling U-Boot with fewer features
-\item Reduce boot time by using U-Boot's Falcon mode
-\end{itemize}
-}
-
diff --git a/slides/boot-time-conclusions/best-techniques.svg b/slides/boot-time-conclusions/best-techniques.svg
index 8ebbeb72..544dc82b 100644
--- a/slides/boot-time-conclusions/best-techniques.svg
+++ b/slides/boot-time-conclusions/best-techniques.svg
@@ -2,20 +2,20 @@
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sodipodi:role="line">Thumb2 toochain</tspan><tspan
id="tspan821"
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sodipodi:role="line">uClibc instead of musl</tspan><tspan
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sodipodi:role="line">Apps with less options</tspan><tspan
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sodipodi:role="line">- 350 ms</tspan><tspan
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sodipodi:role="line">Rootfs simplification</tspan><tspan
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x="75.582146"
y="249.43802"
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sodipodi:role="line">- 170 ms</tspan><tspan
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sodipodi:role="line">Initramfs</tspan><tspan
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sodipodi:role="line">- 20 ms</tspan></text>
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sodipodi:role="line">Disable tracing</tspan><tspan
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sodipodi:role="line">- 550 ms</tspan><tspan
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+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.183993px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
xml:space="preserve"><tspan
- style="text-align:center;text-anchor:middle;stroke-width:0.18399331px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.183993px"
y="146.94347"
x="-24.203562"
id="tspan817-5-6"
sodipodi:role="line">Delay loop calibration</tspan><tspan
id="tspan821-3-12"
- style="text-align:center;text-anchor:middle;stroke-width:0.18399331px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.183993px"
y="157.96777"
x="-24.203562"
- sodipodi:role="line">-82 ms</tspan></text>
+ sodipodi:role="line">-85 ms</tspan></text>
</g>
<g
id="g1426"
- transform="matrix(1.2616403,0,0,1.2646696,-36.967887,-92.060073)"
- style="stroke-width:0.79166913">
+ transform="matrix(1.2616403,0,0,1.2646696,537.17278,-180.01726)"
+ style="stroke-width:0.791669">
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ry="4.8492761"
y="207.79761"
@@ -355,26 +355,26 @@
height="40.065475"
width="97.517853"
id="rect10-6-6-3-9"
- style="opacity:0.7;fill:#f9dc1e;fill-opacity:1;fill-rule:evenodd;stroke:#ff5600;stroke-width:0.62838733;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
+ style="opacity:0.7;fill:#f9dc1e;fill-opacity:1;fill-rule:evenodd;stroke:#ff5600;stroke-width:0.628387;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1" />
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id="text819-7-2-6-3"
y="220.27086"
x="-48.016068"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.20946243px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.209462px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
xml:space="preserve"><tspan
- style="text-align:center;text-anchor:middle;stroke-width:0.20946243px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.209462px"
y="220.27086"
x="-48.016068"
id="tspan817-5-9-0-1"
sodipodi:role="line">Disable SMP</tspan><tspan
id="tspan821-3-1-6-9"
- style="text-align:center;text-anchor:middle;stroke-width:0.20946243px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.209462px"
y="231.29517"
x="-48.016068"
sodipodi:role="line">- 126 ms</tspan><tspan
id="tspan911-2-4"
- style="text-align:center;text-anchor:middle;stroke-width:0.20946243px"
- y="242.31947"
+ style="text-align:center;text-anchor:middle;stroke-width:0.209462px"
+ y="242.31946"
x="-48.016068"
sodipodi:role="line">-4.6 % kernel size</tspan></text>
</g>
@@ -392,20 +392,20 @@
id="text819-7-2-6-1-8"
y="101.20834"
x="284.97189"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
xml:space="preserve"><tspan
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
y="101.20834"
x="284.97189"
id="tspan817-5-9-0-8-4"
sodipodi:role="line">Disable modules</tspan><tspan
id="tspan821-3-1-6-7-5"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
y="112.23265"
x="284.97189"
sodipodi:role="line">- 20 ms</tspan><tspan
id="tspan911-2-9-0"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
y="123.25695"
x="284.97189"
sodipodi:role="line">- 82 KB kernel size</tspan></text>
@@ -426,20 +426,20 @@
id="text819-7-2-1"
y="69.080376"
x="-45.748207"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.10854676px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.108547px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
xml:space="preserve"><tspan
- style="text-align:center;text-anchor:middle;stroke-width:0.10854676px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.108547px"
y="69.080376"
x="-45.748207"
id="tspan817-5-9-06"
sodipodi:role="line">Silent kernel</tspan><tspan
id="tspan821-3-1-3"
- style="text-align:center;text-anchor:middle;stroke-width:0.10854676px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.108547px"
y="80.104683"
x="-45.748207"
sodipodi:role="line">-767 ms</tspan><tspan
id="tspan911-20"
- style="text-align:center;text-anchor:middle;stroke-width:0.10854676px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.108547px"
y="91.128983"
x="-45.748207"
sodipodi:role="line">- 11% kernel size</tspan></text>
@@ -454,7 +454,7 @@
ry="4.8492761" />
<text
xml:space="preserve"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
x="221.10298"
y="15.029776"
id="text819-7-2-15"><tspan
@@ -462,16 +462,16 @@
id="tspan817-5-9-5"
x="221.10298"
y="15.029776"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px">Non standard kernel (EXPERT/EMBEDDED)</tspan><tspan
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px">Non standard kernel (EXPERT/EMBEDDED)</tspan><tspan
sodipodi:role="line"
x="221.10298"
y="26.054081"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
id="tspan821-3-1-4">- 34 ms</tspan><tspan
sodipodi:role="line"
x="221.10298"
y="37.078384"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
id="tspan911-76">- 51 KB kernel size</tspan></text>
<g
id="g1479"
@@ -489,22 +489,22 @@
id="text819-7-7-6"
y="13.706849"
x="22.665464"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.22352587px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.223526px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
xml:space="preserve"><tspan
- style="text-align:center;text-anchor:middle;stroke-width:0.22352587px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.223526px"
y="13.706849"
x="22.665462"
id="tspan817-5-0-9"
sodipodi:role="line">Kernel compression</tspan><tspan
id="tspan821-3-9-3"
- style="text-align:center;text-anchor:middle;stroke-width:0.22352587px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.223526px"
y="24.731153"
x="22.665464"
sodipodi:role="line">-35 ms with LZO</tspan></text>
</g>
<text
xml:space="preserve"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
x="31.372013"
y="-37.508926"
id="text958-7"><tspan
@@ -512,7 +512,7 @@
id="tspan956-4"
x="31.372013"
y="-37.508926"
- style="stroke-width:0.26458332px"> </tspan></text>
+ style="stroke-width:0.264583px"> </tspan></text>
<rect
style="opacity:0.7;fill:#d07481;fill-opacity:1;fill-rule:evenodd;stroke:#ff0a0f;stroke-width:0.79374993;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
id="rect10-6-6-3-6-5-5"
@@ -523,7 +523,7 @@
ry="4.8492761" />
<text
xml:space="preserve"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
x="-51.417892"
y="-43.745518"
id="text819-7-2-6-1-9-2"><tspan
@@ -531,16 +531,16 @@
id="tspan817-5-9-0-8-2-5"
x="-51.417892"
y="-43.745518"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px">Disable sysfs</tspan><tspan
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px">Disable sysfs</tspan><tspan
sodipodi:role="line"
x="-51.417892"
y="-32.721214"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
id="tspan821-3-1-6-7-2-4">- 35 ms</tspan><tspan
sodipodi:role="line"
x="-51.417892"
y="-21.696909"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
id="tspan911-2-9-8-7">- 22 KB kernel size</tspan></text>
<rect
style="opacity:0.7;fill:#94f0ff;fill-opacity:1;fill-rule:evenodd;stroke:#0077ff;stroke-width:0.79374999;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
@@ -552,7 +552,7 @@
ry="3.659831" />
<text
xml:space="preserve"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
x="90.327209"
y="-49.226158"
id="text819-7-2-1-4"><tspan
@@ -560,11 +560,11 @@
id="tspan817-5-9-06-3"
x="90.327209"
y="-49.226158"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px">Disable proc</tspan><tspan
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px">Disable proc</tspan><tspan
sodipodi:role="line"
x="90.327209"
y="-38.201855"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
id="tspan911-20-7">- 48 KB kernel size</tspan></text>
<rect
style="opacity:0.7;fill:#00b8f7;fill-opacity:1;fill-rule:evenodd;stroke:#1c73d6;stroke-width:0.79375005;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
@@ -576,7 +576,7 @@
ry="3.659831" />
<text
xml:space="preserve"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.81944px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
x="222.28786"
y="-37.508911"
id="text819-7-2-0-6"><tspan
@@ -584,48 +584,53 @@
id="tspan817-5-9-2-8"
x="222.28786"
y="-37.508911"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px">Concat kernel and DTB</tspan><tspan
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px">Concat kernel and DTB</tspan><tspan
sodipodi:role="line"
x="222.28786"
y="-26.484606"
- style="text-align:center;text-anchor:middle;stroke-width:0.26458332px"
+ style="text-align:center;text-anchor:middle;stroke-width:0.264583px"
id="tspan911-7-8">- 22 ms</tspan></text>
<g
id="g1405"
- transform="matrix(2.0909091,0,0,2.1132801,-374.81494,-358.37452)"
- style="stroke-width:0.4757227">
+ transform="matrix(2.0909091,0,0,2.1132801,-350.33268,-368.98798)"
+ style="stroke-width:0.475723">
<g
- id="g1398"
- style="stroke-width:0.4757227">
- <rect
- style="opacity:0.7;fill:#ff50c5;fill-opacity:1;fill-rule:evenodd;stroke:#ff7910;stroke-width:0.3776049;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
- id="rect10-6-7-3"
- width="108.10119"
- height="28.348213"
- x="56.69643"
- y="283.20386"
- ry="3.4310915" />
+ id="g7140"
+ transform="translate(-15.690948,4.7576115)">
+ <g
+ id="g1398"
+ style="stroke-width:0.313836"
+ transform="matrix(1,0,0,2.297754,0,-404.31794)">
+ <rect
+ style="opacity:0.7;fill:#ff50c5;fill-opacity:1;fill-rule:evenodd;stroke:#ff7910;stroke-width:0.249107;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
+ id="rect10-6-7-3"
+ width="108.10119"
+ height="28.348213"
+ x="56.69643"
+ y="283.20386"
+ ry="3.4310915" />
+ </g>
+ <text
+ id="text819-7-3-1"
+ y="276.70471"
+ x="110.42894"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10.1735px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.125868px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ xml:space="preserve"><tspan
+ style="text-align:center;text-anchor:middle;stroke-width:0.125868px"
+ y="276.70471"
+ x="110.42894"
+ id="tspan817-5-6-4"
+ sodipodi:role="line">U-Boot Falcon Mode</tspan><tspan
+ id="tspan821-3-12-9"
+ style="text-align:center;text-anchor:middle;stroke-width:0.125868px"
+ y="289.4216"
+ x="110.42894"
+ sodipodi:role="line">-1052 ms</tspan></text>
</g>
- <text
- id="text819-7-3-1"
- y="295.67709"
- x="109.97798"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:8.8194437px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.12586829px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
- xml:space="preserve"><tspan
- style="text-align:center;text-anchor:middle;stroke-width:0.12586829px"
- y="295.67709"
- x="109.97798"
- id="tspan817-5-6-4"
- sodipodi:role="line">U-Boot Falcon Mode</tspan><tspan
- id="tspan821-3-12-9"
- style="text-align:center;text-anchor:middle;stroke-width:0.12586829px"
- y="306.70139"
- x="109.97798"
- sodipodi:role="line">-478 ms</tspan></text>
</g>
<text
xml:space="preserve"
- style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15.41590118px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+ style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:15.4159px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-feature-settings:normal;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
x="-176.43192"
y="327.7753"
id="text914"><tspan
@@ -633,6 +638,6 @@
id="tspan912"
x="-176.43192"
y="327.7753"
- style="stroke-width:0.26458332px">Note: "kernel size" is actually "compressed kernel size" with initramfs inside</tspan></text>
+ style="stroke-width:0.264583px">Note: "kernel size" is actually "compressed kernel size" with initramfs inside</tspan></text>
</g>
</svg>
diff --git a/slides/boot-time-kernel/boot-time-kernel.tex b/slides/boot-time-kernel/boot-time-kernel.tex
index 6b2725ac..de3c9418 100644
--- a/slides/boot-time-kernel/boot-time-kernel.tex
+++ b/slides/boot-time-kernel/boot-time-kernel.tex
@@ -331,11 +331,11 @@ More features you could remove:
{Reduce kernel boot time}
{
\begin{itemize}
-\item Recompile the kernel, switching to an initramfs
\item Use \code{initcall_debug} to find the biggest
time consumers
+\item Optimize existing functionality
\item Remove unused features and drivers
-\item Tune kernel command line parameters
+\item Select the best kernel compression method
\end{itemize}
}
diff --git a/slides/boot-time-u-boot-falcon-mode/boot-time-u-boot-falcon-mode.tex b/slides/boot-time-u-boot-falcon-mode/boot-time-u-boot-falcon-mode.tex
index 6456391a..5f012e8e 100644
--- a/slides/boot-time-u-boot-falcon-mode/boot-time-u-boot-falcon-mode.tex
+++ b/slides/boot-time-u-boot-falcon-mode/boot-time-u-boot-falcon-mode.tex
@@ -454,8 +454,9 @@ mmc0 is current device
\item Here the specific MMC driver in SPL has poor performance (lack
of DMA?)
\item We had much better results on different hardware, such
- as saving 1.2s on i.MX6, and 478 ms on TI AM3359
- (Beagle Bone Black).
+ as saving 1.2s on i.MX6, and 1.05s on TI AM3358
+ (Beagle Bone Black, loading from FAT with U-Boot SPL
+ 2022.04).
\end{itemize}
\end{columns}
\end{frame}
@@ -633,9 +634,10 @@ mmc0 is current device
{Reduce bootloader time}
{
\begin{itemize}
-\item Reduce boot time by compiling U-Boot with fewer features
-\item Optimizing the way U-Boot is used
-\item Skip U-Boot through the {\em Falcon Mode}
+\item Experiment with faster storage
+\item Skipping U-Boot through the {\em Falcon Mode}, directly booting
+ Linux from U-Boot SPL.
+\item Measuring the final boot time.
\end{itemize}
}
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