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add section about booting procedure

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S.J.R. van Schaik 2017-08-04 11:52:00 +02:00
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user-doc/user-doc.tex
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@ -290,4 +290,23 @@ Then we can write the \path{u-boot.bin}, \path{bzImage} and \path{initramfs.cpio
./sunxi-fel -p spiflash-write 0x080000 bzImage
./sunxi-fel -p spiflash-write 0x400000 initramfs.cpio.gz
\end{minted}
\section{Booting ROTS}
After powering up the board, \emph{u-boot} will be loaded.
\emph{u-boot} will then load the Linux kernel image and the initramfs from the SPI NOR flash and boot the Linux kernel with the initramfs as follows:
\begin{minted}[breaklines]{text}
sf probe 0:0 6000000
sf read 42000000 80000 380000
sf read 43000000 400000 400000
bootm 0x42000000 0x43000000
\end{minted}
The ROTS kernel will now boot up and mount the initramfs as the rootfs.
At some point the kernel will run the init script in the initramfs.
When this happens the ROTS will start communicating with the TBM to fetch the time as well as the certificates.
Once these have been retrieved from the TBM, the ROTS will mount the external media such as hard disks and enumerate and verify possible boot images on those media.
\end{document}