[FE training-materials-updates] Flash slides simplification: don't mention major and minor numbers
Michael Opdenacker
michael.opdenacker at free-electrons.com
Wed Nov 4 21:58:45 CET 2015
Repository : git://git.free-electrons.com/training-materials.git
On branch : master
Link : http://git.free-electrons.com/training-materials/commit/?id=e68a56ff3195565b6e6b6a418184a5e38d12cd50
>---------------------------------------------------------------
commit e68a56ff3195565b6e6b6a418184a5e38d12cd50
Author: Michael Opdenacker <michael.opdenacker at free-electrons.com>
Date: Wed Nov 4 21:58:45 2015 +0100
Flash slides simplification: don't mention major and minor numbers
- Managed by devtmpfs anyway
Signed-off-by: Michael Opdenacker <michael.opdenacker at free-electrons.com>
>---------------------------------------------------------------
e68a56ff3195565b6e6b6a418184a5e38d12cd50
slides/sysdev-flash-filesystems/sysdev-flash-filesystems.tex | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/slides/sysdev-flash-filesystems/sysdev-flash-filesystems.tex b/slides/sysdev-flash-filesystems/sysdev-flash-filesystems.tex
index 1ca1876..dfb3052 100644
--- a/slides/sysdev-flash-filesystems/sysdev-flash-filesystems.tex
+++ b/slides/sysdev-flash-filesystems/sysdev-flash-filesystems.tex
@@ -296,9 +296,7 @@ setenv mtdparts mtdparts=omap2-nand.0:512k(X-Loader)ro,1536k(U-Boot)ro,512k(Env)
\item The {\bf mtdchar} driver creates a character device for each
MTD device/partition of the system
\begin{itemize}
- \item Usually named \code{/dev/mtdX} or \code{/dev/mtdXro}, major 90.
- Even minors for read-write access (\code{/dev/mtdX}),
- odd minors for read-only access (\code{/dev/mtdXro})
+ \item Usually named \code{/dev/mtdX} or \code{/dev/mtdXro}
\item Provide \code{ioctl()} to erase and manage the flash
\item Used by the {\em mtd-utils} utilities
\end{itemize}
@@ -850,8 +848,7 @@ vol_alignment=1
\begin{itemize}
\item The \code{mtdblock} layer creates a block device for each MTD
device of the system
- \item Usually named \code{/dev/mtdblockX}, major 31. Minor is the
- number of the MTD device
+ \item Usually named \code{/dev/mtdblockX}.
\item Allows read/write block-level access. But bad blocks are not
handled, and no wear leveling is done for writes.
\item For historical reasons JFFS2 filesystems require a block device
@@ -878,10 +875,6 @@ vol_alignment=1
\item Usually named \code{/dev/ubiblockX_Y}, where X is the UBI device
id and Y is the UBI volume id
- \item Major is dynamically assigned and stay the same for all
- \code{ubiblock} devices
- \item Minor is the id assigned to the \code{ubiblock} device (depends on
- the number of \code{ubiblock} devices and the creation order).
\end{itemize}
\end{frame}
More information about the training-materials-updates
mailing list