“printenv preboot” command will show what the value of this variable is. “preboot” variable is executed before U-Boot shows the prompt to user. But the most important variables are those two It will show huge list of environment variables. To look at all the default environment variables, you can simply type printenv
#RC U BOOT TORPEDO SERIAL#
If U-Boot is successfully booted, it will prompt “Zynq>” via serial console. If Windows, use Putty or TeraTerm to connect to the device).
#RC U BOOT TORPEDO PC#
Open serial terminal on your development PC (/dev/ttyACM0, baud rate: 115200. Insert the SD card which has “ BOOT.bin” in boot partition, and turn on Zedboard. To do so, we will play around with actual U-Boot. We will look at some important environment variables. If an environment variable is a command, then you can execute that command by typing “ run ”. Environment variables can be values, or commands. Also, U-Boot uses a lot of Environment variables. U-Boot uses “ hush (hyper utility shell)” as a command line interface. Then, copy “BOOT.bin” to boot partition in SD card. This is not applicable for Windows.Ĭreate boot image using “ bootgen”. Then, it will create link for that target file. use the command below to create links ln -s. I would recommend using “link” for those files. You can copy those 3 files in the same directory, but in that case, you have to copy it every time you change the design.
As explained in previous section, 3 files are necessary to create boot image arch = zynq split = false format = BIN the_ROM_image: bif file (Boot Image File) should be prepared. Generating boot imageĪs explained in previous section, boot image can be generated using Xilinx SDK GUI, but if you add path to SDK binaries, boot image can be generated via command line (path is added in previous paragraph).īefore generating boot image. Configuring U-BootĬlone Xlilinx U-Boot repository from here. In Windows, add the path to the corresponding directory by customizing “ System Environment Variable” settings. PATH+=":/opt/Xilinx/SDK/ /bin” PATH+=”:/opt/Xilinx/SDK/ /gnu/aarch32/lin/gcc-arm-linux-gnueabi/bin”įirst line is not the path to the Cross Compiler, but later time, we would need some tools in SDK bin. Add the path to those files by adding these two lines in ~/.bashrc (in Linux). If you have Xilinx SDK, Cross Compiler and toolchain are already installed. For example, Cross Compiler runs on x86–64 platform, and generates executables for ARM processors.
Cross Compiler compiles applications and generates the executables for different platform. To configure/compile U-Boot and Linux kernel for ARM processors, Cross Compiler and toolchain are needed. Also, as the name “universal” suggests, this bootloader is compatible with various platforms, and it allows user to utilize boot script and environment variables. Das U-Bootĭas U-Boot (The Universal Bootloader) is a bootloader which is capable of booting Linux OS. Rear Torpedo Tube (Tube V, aft end of the room)Ī bulkhead at the front end of the room leads to the Diesel Engine Room.Ī hatch at the top of the room allows torpedoes to be loaded into the Aft Torpedo Storage from the Warehouse.In this section, as the preparation to boot Linux, a bootloader called “Das U-Boot”, which is capable of booting Linux, will be explained.Pill Launcher (above Diesel Compressor) (if researched).Electric Compressor (port side of the Rear Torpedo Tube).Diesel Compressor (starboard side of the Rear Torpedo Tube)Īft Torpedo Room (as viewed from 3rd person mode).Torpedo storage is both above and below, with two torpedoes being stored above the bunks, and six more below.Ī bulkhead at the aft end of the room leads to the Officer's Room.Ī hatch in the ceiling leads to the Deck, allowing for torpedoes to be loaded from the Warehouse.Īft Torpedo Room (as seen from the Bulkhead) Torpedo tubes are arranged in counter-clockwise fashion, starting with Tube I in the upper right. Forward Torpedo Storage (above and below bunks).
Ballast Tank 5 (surrounding torpedo tubes).If an injured crew is in a bunk, that side of the 4 tubes cannot be opened until they are moved.Ĭontains the following usable equipment/storage: Contains crew bunks that are lifted up when needed to load torpedoes into tubes or warm them. Forward Torpedo Room (as seen from the Bulkhead)
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