[bootlin/training-materials updates] master: C libraries: update size figures (b546bda4)
Michael Opdenacker
michael.opdenacker at bootlin.com
Fri Feb 26 13:17:22 CET 2021
Repository : https://github.com/bootlin/training-materials
On branch : master
Link : https://github.com/bootlin/training-materials/commit/b546bda40a874977293c8230c3a21f6cc66648aa
>---------------------------------------------------------------
commit b546bda40a874977293c8230c3a21f6cc66648aa
Author: Michael Opdenacker <michael.opdenacker at bootlin.com>
Date: Fri Feb 26 13:17:22 2021 +0100
C libraries: update size figures
Signed-off-by: Michael Opdenacker <michael.opdenacker at bootlin.com>
>---------------------------------------------------------------
b546bda40a874977293c8230c3a21f6cc66648aa
slides/c-libraries/c-libraries.tex | 10 ++++++----
slides/sysdev-intro/sysdev-intro.tex | 4 ++--
.../sysdev-toolchains-definition.tex | 9 ++++++---
3 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/slides/c-libraries/c-libraries.tex b/slides/c-libraries/c-libraries.tex
index 38db83c6..3be9e925 100644
--- a/slides/c-libraries/c-libraries.tex
+++ b/slides/c-libraries/c-libraries.tex
@@ -9,7 +9,7 @@
\item Found on all GNU / Linux host systems
\item Of course, actively maintained
\item By default, quite big for small embedded systems.
- On armv7hf, version 2.23: \code{libc}: 1.5 MB, \code{libm}: 492
+ On armv7hf, version 2.31: \code{libc}: 1.5 MB, \code{libm}: 432
KB, source: \url{https://toolchains.bootlin.com}
\item But some features not needed in embedded systems can be
configured out (merged from the old {\em eglibc} project).
@@ -39,11 +39,11 @@
supporting ARM noMMU.
\item No guaranteed binary compatibility. May need to
recompile applications when the library configuration changes.
- \item Some glibc features may be implemented later (real-time,
+ \item Some glibc features may be implemented later than on glibc (real-time,
floating-point operations...)
\item Focus on size rather than performance
- \item Size on armv7hf, version 1.0.24:
- \code{libc}: 652 KB, source: \url{https://toolchains.bootlin.com}
+ \item Size on armv7hf, version 1.0.34:
+ \code{libc}: 712 KB, source: \url{https://toolchains.bootlin.com}
\end{itemize}
\item Actively supported, but Yocto Project stopped supporting it.
\end{itemize}
@@ -65,6 +65,8 @@
Project.
\item Used by the Alpine Linux lightweight distribution
(\url{https://www.alpinelinux.org/})
+ \item Size on armv7hf, version 1.2.0:
+ \code{libc}: 748 KB, source: \url{https://toolchains.bootlin.com}
\end{itemize}
\column{0.15\textwidth}
\includegraphics[width=\textwidth]{slides/c-libraries/musl.png}
diff --git a/slides/sysdev-intro/sysdev-intro.tex b/slides/sysdev-intro/sysdev-intro.tex
index 66fbf82b..ba22d9f1 100644
--- a/slides/sysdev-intro/sysdev-intro.tex
+++ b/slides/sysdev-intro/sysdev-intro.tex
@@ -264,8 +264,8 @@
\item {\bf Storage}: a very basic Linux system can work within 4 MB
of storage, but usually more is needed.
\begin{itemize}
- \item Block storage: SD/MMC/eMMC, USB mass storage, SATA, etc,
- \item Flash storage is supported too, both NAND and NOR flash, with
+ \item {\bf Block storage}: SD/MMC/eMMC, USB mass storage, SATA, etc,
+ \item {\bf Raw flash storage} is supported too, both NAND and NOR flash, with
specific filesystems
\end{itemize}
\item Not necessarily interesting to be too restrictive on the
diff --git a/slides/sysdev-toolchains-definition/sysdev-toolchains-definition.tex b/slides/sysdev-toolchains-definition/sysdev-toolchains-definition.tex
index 061be517..759cc321 100644
--- a/slides/sysdev-toolchains-definition/sysdev-toolchains-definition.tex
+++ b/slides/sysdev-toolchains-definition/sysdev-toolchains-definition.tex
@@ -72,8 +72,10 @@
\item \code{strip}, to strip parts of binaries that are just needed
for debugging (reducing their size).
\end{itemize}
- \item \url{https://www.gnu.org/software/binutils/}
- \item GPL license
+ \item GNU Binutils: \url{https://www.gnu.org/software/binutils/}, GPL license
+ \item The LLVM project now provides alternatives to GNU Binutils:
+ \code{llvm-strip}, \code{llvm-readelf}...
+ (\url{https://www.llvm.org/docs/CommandGuide/})
\end{itemize}
\end{frame}
@@ -116,7 +118,8 @@
\begin{verbatim}
#define O_RDWR 00000002
\end{verbatim}
-\item Data structures, here in \code{<asm/stat.h>}
+\item Data structures, here in \code{<asm/stat.h>} (used by the
+\code{stat} command)
\begin{verbatim}
struct stat {
unsigned long st_dev;
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