diff options
| -rw-r--r-- | flash-memory/flash-filesystems/Makefile | 9 | ||||
| -rw-r--r-- | flash-memory/flash-filesystems/pres_flashfilesystems_en.tex | 170 |
2 files changed, 179 insertions, 0 deletions
diff --git a/flash-memory/flash-filesystems/Makefile b/flash-memory/flash-filesystems/Makefile new file mode 100644 index 0000000..4663d52 --- /dev/null +++ b/flash-memory/flash-filesystems/Makefile @@ -0,0 +1,9 @@ +all: + for pdf in `ls -1 *.tex` ; do \ + pdflatex $$pdf; \ + pdflatex $$pdf; \ + done + +clean: + rm -f *.aux *.log *.pdf *.log *.snm *.toc *.vrb *.nav *.out + diff --git a/flash-memory/flash-filesystems/pres_flashfilesystems_en.tex b/flash-memory/flash-filesystems/pres_flashfilesystems_en.tex new file mode 100644 index 0000000..2708766 --- /dev/null +++ b/flash-memory/flash-filesystems/pres_flashfilesystems_en.tex @@ -0,0 +1,170 @@ +\documentclass[11pt]{beamer} + +%\usepackage{ngerman} +\usepackage{times} +\usepackage{graphicx} +\usepackage{pgf,pgfarrows,pgfnodes,pgfautomata,pgfheaps} +\usepackage{amsmath,amssymb} +\usepackage[latin1]{inputenc} +\usepackage{listings,color} +\definecolor{lbcolor}{RGB}{255,210,150} +\lstset{ + language=C, + numbers=left, + stepnumber=1, + numbersep=5pt, + numberstyle=\tiny, + breaklines=true, + breakautoindent=true, + postbreak=\space, + tabsize=2, + basicstyle=\ttfamily\footnotesize, + showspaces=false, + showstringspaces=false, + extendedchars=true, + backgroundcolor=\color{lbcolor}, + keywordstyle=\bf , + commentstyle=\color{green}, + stringstyle=\color{red} +} + +\mode<presentation> +{ + \usetheme{linutronix} +} + +% on the following slides, include icon in the left sidebar +\def\lximg{/usr/share/lx/icons/fueller.png} + +\title{Creating Flashfilesystems} +\institute{Linutronix GmbH} + +\begin{document} + +\frame{ \titlepage } + +% stop displaying 'fueller.png' on the following slides +\def\lximg{none} + +\begin{frame}[fragile] +\frametitle{Emulating flash devices} +\begin{lstlisting} +$ sudo modprobe nandsim +$ cat /proc/mtd +dev: size erasesize name +mtd0: 08000000 00004000 "NAND simulator partition 0" +$ dmesg +[...] +[ 128.718421] flash size: 128 MiB +[ 128.718423] page size: 512 bytes +[ 128.718425] OOB area size: 16 bytes +[ 128.718426] sector size: 16 KiB +[...] +\end{lstlisting} +\end{frame} + +\begin{frame}[fragile] +\frametitle{Using JFFS2} +\begin{lstlisting} +# Create JFFS2 image +$ mkfs.jffs2 -e 131072 \ + -d source_directory \ + -o jffs2.img +# Erase flash partition +$ flash_erase -j /dev/mtd0 0 0 +# Write jffs2 image +$ nandwrite /dev/mtd0 jffs2.img +# Mounting the image +$ mount /dev/mtdblock0 /mnt +\end{lstlisting} +\end{frame} + +\begin{frame}[fragile] +Kernelparameters: +\begin{verbatim} +root=/dev/mtdblock0 rootfstype=jffs2 +\end{verbatim} +\end{frame} + +\begin{frame}[fragile] +\frametitle{Using UBIFS} +\begin{lstlisting} +# 1) Attaching UBI to an MTD device +modprobe ubi +ubiattach ubiattach -m 0 +# or +modprobe ubi mtd=0 +# 2) Gathering some information +$ dmesg +UBI: attaching mtd0 to ubi0 +UBI: physical eraseblock size: 16384 bytes (16 KiB) +UBI: logical eraseblock size: 15872 bytes +UBI: smallest flash I/O unit: 512 +UBI: sub-page size: 256 +UBI: VID header offset: 256 (aligned 256) +UBI: data offset: 512 +[...] +# 3) Creating a volume +$ ubimkvol /dev/ubi0 -N myvolume -s 64MiB +\end{lstlisting} +\end{frame} + +\begin{frame}[fragile] +\frametitle{Using UBIFS} +\begin{lstlisting} +# 4) Creating an UBIFS image +$ mkfs.ubifs -r test -m 512 -e 15872 \ + -c 8450 -o ubifs.img +# 5) Writing the image +$ ubiupdatevol /dev/ubi0_0 ubifs.img +# 6) Mounting UBIFS +$ mount -t ubifs ubi0:myvolume /mnt/ +\end{lstlisting} +\end{frame} + +\begin{frame}[fragile] +\frametitle{UBI: Create flash images} +ubinize.cfg: +\begin{verbatim} +[ubifs] +mode=ubi +image=ubifs.img +vol_id=0 +vol_size=64MiB +vol_type=dynamic +vol_name=myvolume +vol_flags=autoresize +\end{verbatim} +\end{frame} + +\begin{frame}[fragile] +\frametitle{UBI: Create flash images} +\begin{lstlisting} +# 1) Create the ubi image +ubinize -o ubi.img -m 512 -s 256 -p 16384 ubinize.cfg +# 2) erase the flash partition +flash_erase /dev/mtd0 0 0 +# 3) Write the image +nandwrite /dev/mtd0 ubi.img +# 4) Attach UBI +ubiattach -m 0 +# 5) Mount UBIFS +mount -t ubifs ubi0:myvolume /mnt/ +\end{lstlisting} +\end{frame} + +\begin{frame}[fragile] +\frametitle{UBIFS as a rootfilesystem} +Kernelparameters: +\begin{verbatim} +ubi.mtd=0 root=ubi0:myvolume rootfstype=ubifs +\end{verbatim} +\end{frame} + +\section*{sources} +\begin{frame} +\begin{thebibliography}{1} +\bibitem{UBIFS} http://mytechrants.wordpress.com/2010/01/20/ubiubifs-on-nandsim/ +\end{thebibliography} +\end{frame} +\end{document} |