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Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commit…. The development of U-Boot is closely related to Linux: some parts of the source code originate in the Linux source tree, we have some header files in common, and special provision has been made to support booting of Linux images.
Some attention has been paid to make this software easily configurable and extendable. For instance, all monitor commands are implemented with the same call interface, so that it's very easy to add new commands. Also, instead of permanently adding rarely used code for instance hardware test utilities to the monitor, you can load and run it dynamically.
In fact, many of them are used in production systems. There is also an archive of previous traffic on the mailing list - please search the archive before asking FAQ's. The spelling "U-Boot" shall be used in all written text documentation, comments in source files etc.
File names etc. Regular releases are identified by names consisting of the calendar year and month of the release date. Additional fields if present indicate release candidates or bug fix releases in "stable" maintenance trees. Examples: U-Boot v Previously, all configuration was done by hand, which involved creating symbolic links and editing configuration files manually.
More recently, U-Boot has added the Kbuild infrastructure used by the Linux kernel, allowing you to use the "make menuconfig" command to configure your build. Sandbox Environment: U-Boot can be built natively to run on a Linux host using the 'sandbox' board.
This allows feature development which is not board- or architecture- specific to be undertaken on a native platform. The sandbox is also used to run some of U-Boot's tests. Board Initialisation Flow: This is the intended start-up flow for boards.
At present, SPL mostly uses a separate code path, but the function names and roles of each function are the same. Some boards or architectures may not conform to this. Execution typically starts with an architecture-specific and possibly CPU-specific start. S and so on. From there, three functions are called; the purpose and limitations of each of these functions are described below. Many of the options are named exactly as the corresponding Linux kernel configuration options.It is designed to quickly provide the information you need most while evaluating a TI microprocessor, specifically running one of the Software Architectures available, embedded Linux.
We are always striving to improve this product. Please let us know if you have ideas or suggestions. If you have feedback, suggestions, or ideas on how to improve the SDK, it is very appreciated.
Please post your ideas to the Linux forum listed at Technical Support. Overview 2. Release Specific 3. Foundational Components 4. Industrial Protocols 5. Examples and Demos 6. How to Guides 7. Documentation Tarball.
We intend to retain the look and feel of the content to make this transition seamless, and yet provide the users with the benefits of consuming the content generated with emergent documentation tools. Wiki content will be left for reference during this migration process to find any missing old content.
Feel free to drop us a note using the forums listed at Technical Supportand we would love to hear from you. Supported Platforms and Versions. Directory Structure Overview.
Serial Boot and Flash Loading Utility
Release Notes. Machine Learning.It is recommended to download any files or other content you may need that are hosted on processors. The site is now set to read only. This section show the major updates since last release, please review this section before any SW activities.
The 2nd and the 3rd stage bootloaders are based on U-Boot. In the rest of this document when referring to the binaries, the binary for the 2nd stage is referred to as U-Boot-MIN and the binary for the 3rd stage as simply U-Boot. Note 1. Please note the difference in the U-Boot prompt for the 2 stages. The prompt specified in the commands is meant to serve as an indication of which stage it should be executed from.
Most of the commands mentioned in the doc are meant to be executed from the 2nd stage. NOR boot has only two stages of bootloader. ROM code serves as the Ist stage bootloader and the u-boot serves as the second stage boot loader. The first stage or rather the 2nd stage if the ROM code is also considered is built using a minimal configuration and has an embedded ENV.
The boot command that the minimal U-Boot uses for fetching the larger U-Boot will not change for a particular boot mode as long as the same layout is used and is hence fixed. If any other behavior required then the minimal U-Boot stage can be interrupted and a different command issued.
The minimal U-Boot binary also has a hole at the top which is used as the space for stack, heap and global data. After some analysis the size of the hole has currently been set as 12KB. We will aussume that all PG1. Note To use PG2. The default behavior is to place the ENV section of U-Boot where the environment variables are stored in the same media for which U-Boot was built.
For easy generation of the different images, different target names have been provided in the Makefile. The different target names take care of building the appropriate image with or without the header and with or without endian conversion.
Please note that the U-Boot-MIN stage uses a pre-defined command to load the 2nd stage and does not support commands such as dhcp, tftp, saveenv etc. All the commands are available only from the 2nd stage of U-Boot which the 1st stage U-Boot autoloads if present. It fetches the larger U-Boot image from SPI if present and passes control passed to it automatically.Wearing blue clothes in dream
It fetches the larger U-Boot image from SD card if present and passes control passed to it automatically. The media to be used stored for saving the ENV variables needs to be decided before building the 2nd stage of U-Boot.
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I've been having some issues debugging U-Boot. I believe it is due to a RAM configuration error, but I would like to get some clarity on it. My methodology for testing is below, and is based on these instructions for the BeagleBone Black. Run SPL, and pause after I receive a message such as this one:. My guess is that this is because the SDRAM was not configured correctly, resulting in an erroneous read, considering that the first instruction is a branch, which could result in the erroneous PC value.J naam wale log
Am I going crazy with the notion that this could be the RAM? Since I have evidence of a working RAM configuration for the same SoC doing the same behaviour, or is there something else that I am missing? Learn more. U-Boot uncontrollable debug stepping Ask Question. Asked 2 years, 8 months ago. Active 2 years, 7 months ago.
Viewed times. Brendan 1 1 gold badge 11 11 silver badges 25 25 bronze badges. Wallis T. Wallis 11 11 bronze badges. Boot from SDcard for the "good" configuration, and use the md command to dump the entire register block of the memory controller. Then obtain another register dump under the problematic situation using JTAG? Compare the two sets, and try to account for every difference. BTW "1.It is recommended to download any files or other content you may need that are hosted on processors.
The site is now set to read only. Booting the Linux kernel on an embedded platform is not as simple as simply pointing a program counter to the kernel location and letting the processor run. This wiki will review the four bootloader software stages that must be run before the kernel can be booted and run on the device. Because of this limited amount of RAM, multiple bootloader stages are needed.
These bootloader stages systematically unlock the full functionality of the device so that all complexities of the device are available to the kernel. The first stage bootloader is housed in ROM on the device. The ROM bootloader code is hardcoded into the device and cannot be changed by the user. Because of this, it is important to get an understanding of what exactly the ROM code is doing. The main purpose of the ROM code is to set up the device for the second stage bootloader.Pkhex mystery gift
These pins also set other boot parameters i. For more information on these other boot parameters, see Chapter 26 of the Technical Reference Manual Coloured text. From the picture below, the unpopulated pads correlate to sysboot pins that are pulled down 10K Ohmwhile the populated pads are pullups K Ohm. The SPL has very limited configuration or user interaction, and mainly serves to set-up the boot process for the next bootloader stage: U-boot.
U-BOOT allows for powerful command-based control over the kernel boot environment via a serial terminal. The user has control over a number of parameters such as boot arguments and the kernel boot command. In addition, U-boot environment variables can be configured. These environment variables are stored in the uEnv. These environment variables can be viewed, modified, and saved using the printenv, setenv, and saveenv commands, respectively.
This header is a 64kB block of information that includes the target architecture, the operating system, kernel size, entry points, etc. When booting uImage via U-boot, the header information is displayed on the command output. After reading and outputting the header file, u-boot will begin to boot the linux kernel.
If you encounter an issue in this stage of the boot process, please consult "Kernel - Common Problems Booting Linux" link. Which bootloader sources are available depends on the bootloader stage.
The kernel and filesystem can be sourced from a number of boot locations.
Booting Linux kernel using U-Boot
Once a bootloader is sourced, it is important to understand where the bootloader is loaded into memory. Processors like the AMx define a memory map that states where both internal memory and DDR are mapped to an address set. However, once started, these bootloaders may relocate themeselves in memory.
This is illustrated in the image below:. From Texas Instruments Wiki. Jump to: navigationsearch. Navigation menu Personal tools Log in Request account. Namespaces Page Discussion. Views Read View source View history.Welcome to the Linux Getting Started Guide.
The SDK as we affectionately call it is our attempt to provide a great starting point to develop an embedded system on a TI Processor running Linux. Given this goal, we wanted to provide something that is more than just a typical Board Support Package BSP containing a bootloader, Linux kernel, and filesystem. So, the SDK also contains tools for developing on TI Processors a validated cross-compiling toolchain, for examplepre-built libraries that you can use without having to rebuild them yourself, and some documentation to help explain how all of these pieces work together.
Matrix is a fairly simple embedded Linux system that highlights some of the key features of the TI Processor offering LCD display, graphics, networking, etc. One of the big challenges with starting development on a new platform not to mention, a new Operating System OS for manyis getting an environment set up where you can build and debug code on hardware.
The SDK attacks this problem with providing everything you need to do development, and it is validated on standard TI hardware platforms EVMs see here for more details. It wraps all of this up into one simple installer that helps get everything you need in the right place to do development. For example, you can start off with simply re-building the Linux Embedded System that we provide to validate that everything is working on your system.
This simple step gives you confidence that you can move forward from a good baseline.Embedded Linux Booting Process (Multi-Stage Bootloaders, Kernel, Filesystem)
As you go along your development journey and have questions, there is documentation and support available to you. What would you like to do with the SDK? As described above, the SDK has a lot to it. This is a somewhat involved process focusing on the second of the two parts of the SDK listed above and may be more than some people want to start with.
However, it provides access to the full spectrum of development from rebuilding the SDK from sources to fully adapting it with new device drivers and applications. If this is not good enough and you really want to get your hands on something, check out the next section which shares how to play with the embedded Linux system featuring Matrix, the first piece of the SDK mentioned earlier. So, if you want to see an example of what you can build with the SDK and actually hold it in your hands and play with it or show it to someone else that needs help understanding what you want to do with itwith minimal effort, you can simply run the SDK Embedded Linux System with Matrix on a supported Hardware platform.
This will allow you to poke and prod and interact. If that is the case, simply plug the card in, boot it up, and let your imagination run wild. Or, maybe, the SDK on your SD card is simply a few revisions old and you want the latest and greatest. But, even this is enough to get the imagination going and all some folks want to do.
The Linux host is generally much faster and has a lot more memory both RAM and hard disk space than the typical embedded system. While it is certainly possible to do all development natively, we feel the advantages of using a host provide a better way to go and what is supported out of the box with the SDK. There are many, many ways to get access to a Linux host. Can you use other versions of Ubuntu or even other distributions? If you can use the Ubuntu version validated against the SDK, it will be the smoothest path and we will be able to help you more if you do run into trouble.
Likewise, we would strongly recommend getting a native bit Ubuntu LTS machine set up for development.
Virtual Machines VMs have come a long way over the years, and many people use them daily without problems. However, when you are working with a target embedded system that may be a prototype boardwhether it be a TI board or eventually your own, removing the complexity of a VM from the get go can avoid a lot of frustration i.
When using a VM while connecting and disconnecting hardware components, you have to be very diligent about making sure what is connected to what. Processor SDK Installer is bit, and installs only on bit host machine. Support for bit host is dropped as the cross-compile toolchain is available only for bit machines. If using a virtual machine as your Linux host, you may need to import the SD Card reader into your virtual machine disconnect it from the host and connect it to the VM so that the Linux VM can see it.
There are many ways to connect the host development platform and the target board.We assume that a GCC-based toolchain has already been installed and the serial port for the board has been configured. We also assume that a Linux Kernel has already been built or has been provided as well as an appropriate filesystem image.
Installing and setting up DHCP or TFTP servers is also outside of the scope of this document, but snippets of information are provided to show how to use a specific feature, when needed.
A note about device trees. With this LCPD release all boards are required to use a device tree to boot. To facilitate this in Sitara family devices, within U-Boot we have a command in the environment named findfdt that will set the fdtfile variable to the name of the device tree to use, as found with the kernel sources.
The device tree is expected to be loaded from the same media as the kernel, and from the same relative path. We strongly recommend the use of separate object directories when building.
The Boot Process
We also recommend that you use an output directory name that is identical to the configuration target name. That way if you are working with multiple configuration targets it is very easy to know which folder contains the u-boot binaries that you are interested in.
We strongly recommend using the toolchain that came with the Linux Core release that corresponds to this U-Boot release. For e. Building of both u-boot and SPL is done at the same time.
You must however first configure the build for the board you are working with. Use the following table to determine what defconfig to use to configure with:. Note that not all possible build targets for a given platform are listed here as the community has additional build targets that are not supported by TI.
When we restore defaults some variables will become unset, and this can lead to other things not working such as findfdt that rely on these run-time set variables. It is possible to reset the set of U-Boot environment variables to their defaults and if desired, save them to where the environment is stored, if applicable. It is also required to restore the default setting when u-boot version changes from an upgrade or downgrade.
To do so, issue the following commands:. Then issue the following command:. You can use the printenv command to see if usbethaddr is already set. The default behavior of U-Boot is to utilize all information that a DHCP server passes to us when the user issues the dhcp command.
This will include the dhcp parameter next-server which indicates where to fetch files from via TFTP. There may be times however where the dhcp server on your network provides incorrect information and you are unable to modify the server. In this case the following steps can be helpful:.
To know the amount of RAM available for downloading images or for other usage, use bdinfo command. After booting, U-Boot relocates itself along with its various reserved RAM areas and places itself at end of available RAM starting at relocaddr in bdinfo output above.
Only the stack is located just before that area. The address of top of the stack is in sp start in bdinfo output and it grows downwards.
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