custom-bootloader | demo tutorial for low-level and kernel developers

by apriorit C++ Version: Current License: MIT

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kandi X-RAY | custom-bootloader Summary

custom-bootloader is a C++ library typically used in Embedded System applications. custom-bootloader has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

This project was created as a demo tutorial for low-level and kernel developers. The sample researched is a custom bootloader code to replace/complement a default Windows boot loader.

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custom-bootloader has a low active ecosystem.

It has 62 star(s) with 33 fork(s). There are 9 watchers for this library.

It had no major release in the last 6 months.

There are 0 open issues and 1 have been closed. On average issues are closed in 597 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of custom-bootloader is current.

Quality

custom-bootloader has no bugs reported.

Security

custom-bootloader has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

custom-bootloader is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

custom-bootloader releases are not available. You will need to build from source code and install.

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custom-bootloader Key Features

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custom-bootloader Examples and Code Snippets

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Community Discussions

Trending Discussions on custom-bootloader

Booting from iso image why memory address of bootloader is not 0x7c00

Interrupts Not Working When I Jump to Application (STM32)

QUESTION

Booting from iso image why memory address of bootloader is not 0x7c00

Asked 2020-Jun-07 at 02:56

I write a small bootloader for study purpose, which will print out the memory address of the first instruction of the bootloader, it is definitely 0x7c00. See below assembly source code is running well.

boot.s

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ANSWER

Answered 2020-Jun-06 at 20:14

It's caused because of a common misinterpretation of the El Torito CD-ROM boot specification which says that emulated bootsectors should be loaded at the "traditional segment of 7C0" by default. It doesn't say that a non-traditional starting address of 07C0:0000 should be used instead of the traditional 0000:7C00, but BIOS writers have interpreted this as a requirement nonetheless.

While you can assume that your bootsector is loaded at a linear address of 00007C00 and that the BIOS starts execution of your code at the first byte of the bootsector, you can't assume any particular value of CS:IP. While most bootsectors can be written not to depend on the segment value loaded into CS, as near JMP and CALL instructions are relative, if yours does then you'll need to put a far JMP instruction your code to ensure CS is loaded with the expected segment value:

Source https://stackoverflow.com/questions/62233726

QUESTION

Interrupts Not Working When I Jump to Application (STM32)

Asked 2019-Mar-12 at 14:30

Update: Maybe the better question to ask is how should I go about debugging this problem? I'm using VS Code with OpenOCD debugger. I always clean build. The best I can do once I JumpToApplication() is see what addresses the debugger stops at when I pause/step into.

I am able to flash a program into Partition A (@address 0x8060000) and verify it with a CRC check. The program runs anything in while loop fine (LED3 toggling, UART); however, the LED2 toggling based off of a timer interrupt does not work. When I flash the program normally (ie not with my bootloader) it works 100%, including LED2 toggling.

Here are some of the resources I have addressed (1, 2, 3, AN2606). How do I get the interrupts working for my second application? The resources recommend I clear pending interrupts, but I don't know the best way to approach that. In my bootloader app I use the ETH, UART and GPIO peripherals so I will go through the manual and read registers to clear the interrupt flags but what about the other interrupts like NMI, HardFault, do I have to figure out how to clear those as well? Through my Google searching I have not found any convenient functions to clear all pending interrupts, does it exist?

Below I include the jump function/linker file for the bootloader application at 0x8000000 and the main.c/linker file for the application at 0x8060000:

JUMP FUNCTION IN BOOTLOADER PROGRAM AT 0x8000000

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ANSWER

Answered 2019-Mar-12 at 13:34

In projects generated by STM32CubeMX, the SystemInit() function in system_stm32f4xx.c, called by the startup code before main(), resets the vector table address register to the start of the FLASH.

Source https://stackoverflow.com/questions/55119482

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install custom-bootloader

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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