1/1/2024 0 Comments Linux u boot tutorialIve been stuck on the U-boot part owing to not. If you want to use version 4.2, you have to configure kernel like below In menuconfig, go to “Filesystem” -> “Network filesystem”, then you will see this. Ive been following this tutorial on how to set-up a basic boot loader configuration on an embedded system. Also note that, by default, NFS version 4.2 is not supported. If this doesn’t match, root filesystem won’t be mounted. Check it by running “nfsstat -m” on server. By default, NFS server uses “version 4.2”. Other thing to note is, double check NFS version. GPIO are specified in bank and IO in this manual. Because, you will have mounted NFS using this, specific IP address, imagine what happens if you change IP address later (NFS will be dismounted, meaning, root filesystem will have gone…). Boot to the full operating system for more GPIO support. In this article, setting up TFTP server will be skipped (it’s quite easy, and you can easily find the article for that).Ĭreate uEnv.txt with the contents like below serverip=192.168.150.250 ipaddr=192.168.150.210 tsrc_file=zed-node/boot.scr tsrc_addr=0x200000 bootcmd=tftpboot $,tcp,nfsvers=4.2Īlso note that, IP address set here will be used for this device’s IP address after booting, and you won’t be able to change this. Through TFTP, u-boot can download “ hardware bitstream for FPGA”, “ device tree blob”, and “ kernel image” from network. Booting Linux kernel from networkīecause u-boot can’t handle NFS (actually, u-boot can, but not really well supported), we need to use TFTP (Trivial File Transfer Protocol) for this. To achieve this goal, 2 different steps are needed “ booting Linux kernel from network”, and “ mounting root filesystem from network”. If SD card is broken, you just have to recover quite a few boot related files. But if, you configure u-boot once, the device can download all other things (hardware bitstream, device tree blob, kernel and rootfs) from network, it will save your work significantly. Step 3 needs “physical access” to the device, and this is really painful. Generate boot file, and put everything onto SD card.Compile the kernel again with new device drivers.Change hardware design, and generate new hardware bitstream and dtb.If you are using this device, this might happen Zedboard has SoC (System on Chip), which has FPGA. This is really useful if you are using devices like Zedboard. U-boot is capable of connecting to network, and be able to download various files from network. But true reason for that is, to boot other nodes from network. If you know boot process very well, you might have wondered, “why using u-boot? Changing boot arguments is enough to boot 64 bit Linux from USB”. In last article, I mentioned, booting Raspberry pi using “u-boot”.
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