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Rewrite introduction to U-Boot Installation.

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Includes some additional detail from the instructions themselves.
This commit is contained in:
Bradley M. Kuhn 2014-11-09 10:17:58 -05:00
parent a85626f9d9
commit 65644adce4
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52
enforcement-case-studies.tex
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@ -602,16 +602,50 @@ compilation).
The U-Boot installation process is substantially more complicated than the
firmware update. The investigator purchased the optional serial cable
along with the TPE-NWIFIROUTER, in order to complete the U-Boot installation
per the instructions in ``u-boot\verb0_0reflash''.
per the instructions in ``u-boot\verb0_0reflash'' in its section ``Installing
u-boot to your router'', which reads:
However, the investigator was only able to read data from the serial port; the
investigator was unable to send key events via the serial port so the U-Boot
console could not be accessed in that way. The investigator did find another
way of accessing the U-Boot console, though, which was used to complete the
U-Boot installation and verification. The likely issue with the serial port was
initial mis-wiring of the serial connector, causing the receive pin to be
permanently disabled. Here are the steps the investigator tried, including the
alternate method of installation that did not require the serial console:
\begin{quotation}
\begin{enumerate}
\item Install and configure any TFTP server on your PC (tftp-hpa).
Set a fixed IP address on your PC \ldots and connect it to the router,
using RJ45 network cable \ldots
\item Connect USB to UART adapter to the router and start any application to
communicate with it, like PuTTY. \ldots
\item Power on the router, wait for a line like one of the following and
interrupt the process of loading a kernel:
\begin{verbatim}
Autobooting in 1 seconds (for most TP-Link routers, you should enter tpl at this point)
Hit ESC key to stop autoboot: 1 (for 8devices Carambola 2, use ESC key)
Hit any key to stop autoboot: 1 (for D-Link DIR-505, use any key)
\end{verbatim}
\item Set ipaddr and serverip environment variables:
\lstset{tabsize=2}
\begin{lstlisting}
hornet> setenv ipaddr 192.168.1.1
hornet> setenv serverip 192.168.1.2
\end{lstlisting}
\end{enumerate}
\end{quotation}
At this point in the installation process, hitting a key failed to interrupt
the boot process and yield the \verb0hornet>0 prompt. For the investigator,
this became a moment of consideration: is this
However, the investigator was only able to read data from the serial port;
the investigator was unable to send key events via the serial port so the
U-Boot console could not be accessed in that way. The investigator did find
another way of accessing the U-Boot console, though, which was used to
complete the U-Boot installation and verification. The likely issue with the
serial port was initial mis-wiring of the serial connector, causing the
receive pin to be permanently disabled. Here are the steps the investigator
tried, including the alternate method of installation that did not require
the serial console:
\begin{itemize}