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environment space where several variables can be stored.
These variables are extremely useful to permanently save
system settings (such as ethernet MAC address) and to
automate boot procedures. This environment is redundantly
stored in two physical sectors of boot flash memory; the default
variables set is hard-coded in the source code itself. User can
modify these variables and add new ones in order to create
his/her own custom set of configurations. The commands used
to do that are
setenv
and
saveenv
. This process allows the
user to easily set up the required configuration. Once U-Boot
prompt is available, it is possible to print the whole
environment by issuing the command
printenv
.
For further information on use of U-Boot, please refer to
http://www.denx.de/wiki/view/DULG/UBoot
3.2.5
Kernel
Linux kernel for Zynq processors is maintained primarily by
Xilinx, that constantly works in close cooperation with Linux
community in order to push all the released drivers into
mainstream kernel.
Kernels released within BELK derive directly from Xilinx Zynq
kernels, with patches added by
DAVE Embedded Systems
to
support the BORA hardware platform.
3.2.6
Target root fle system
The Linux kernel running on the target needs to mount a root
file system. Building a root file system from scratch is
definitively a complex task because several well known
directories must be created and populated with a lot of files
that must follow some standard rules. Again we will use
pre-packaged root file systems that make this task much easier.
Please note that using a pre-packaged root file system can lead
to conflicts with the application binaries obtained using the
pre-built cross-toolchain: as a general rule, dynamically linking
an application against libraries built with a different toolchain
can cause malfunctioning.
March, 2016
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