vgabios | Mirror of git.qemu.org/vgabios.git | Emulator library

by qemu C Version: Current License: LGPL-2.1

X-Ray Key Features Code Snippets Community Discussions(4)Vulnerabilities Install Support

kandi X-RAY | vgabios Summary

vgabios is a C library typically used in Utilities, Emulator, Raspberry Pi applications. vgabios has no bugs, it has no vulnerabilities, it has a Weak Copyleft License and it has low support. You can download it from GitHub.

The goal of this project is to have a LGPL'd Video Bios in plex86, Bochs and qemu. This VGA Bios is very specific to the emulated VGA card. It is NOT meant to drive a physical vga card.

Support

Quality

Security

License

Reuse

Support

vgabios has a low active ecosystem.

It has 14 star(s) with 11 fork(s). There are 5 watchers for this library.

It had no major release in the last 6 months.

vgabios has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of vgabios is current.

Quality

vgabios has 0 bugs and 0 code smells.

Security

vgabios has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

vgabios code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

vgabios is licensed under the LGPL-2.1 License. This license is Weak Copyleft.

Weak Copyleft licenses have some restrictions, but you can use them in commercial projects.

Reuse

vgabios releases are not available. You will need to build from source code and install.

Installation instructions are available. Examples and code snippets are not available.

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vgabios Key Features

No Key Features are available at this moment for vgabios.

vgabios Examples and Code Snippets

No Code Snippets are available at this moment for vgabios.

Community Discussions

Trending Discussions on vgabios

bochs booting from floppy FLOPPY: read() on floppy image returns 0

How to launch openbios from Qemu

Second stage bootLoader not loading in bochs, LINUX (ubuntu 16.04), Brokenthorn osdev series

int 13h 42h doesn't load anything in Bochs

QUESTION

bochs booting from floppy FLOPPY: read() on floppy image returns 0

Asked 2018-Sep-07 at 06:01

i study os recently, but I can not make bootloader work

bochsrc.floppy:

...

ANSWER

Answered 2018-Sep-07 at 06:01

In the original project their run.sh file contained a crucial set of lines that creates the disk image boot.img so that it is the size of a 1.44MB floppy. You will need to add them to the top of your run.sh:

Source https://stackoverflow.com/questions/52207463

QUESTION

How to launch openbios from Qemu

Asked 2018-Jul-20 at 07:09

Good day,

So I am following this coreboot v3 + OpenBIOS tutorial Here .

In the instructions I have the following...

...

ANSWER

Answered 2018-Jul-20 at 07:09

The examples are not up to date, as you have noticed by the renaming of qemu to qemu-system-x86_64.

I managed to get the examples to work using only the cirrus video card, and by renaming the outputs of the zips (bin - bios files to bios-256k.bin). I did this because by adding the -L option I specify the bios location and qemu will look for a file called bios-256k.bin as the bios. The command to run the bios with cirrus (all done while in the foo directory) was

Source https://stackoverflow.com/questions/49405417

QUESTION

Second stage bootLoader not loading in bochs, LINUX (ubuntu 16.04), Brokenthorn osdev series

Asked 2018-Jan-05 at 17:02

I am following brokenthorn OS development series, until now I am able sucessfully run bootloader stage1 but there is some issue with loading second stage bootloader from FAT12 floppy in bochs emulator on linux machine(ubuntu 16.04) (It works fine in virtual box though). Here is my stage1 boot loader:

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ANSWER

Answered 2018-Jan-05 at 16:56

It may be because you are are attempting to use /dev/loop0 in Bochs while it is still open and active as a mount point. It may be possible that after the copy of KRNLDR.SYS to the floppy the file and/or fat tables haven't been flushed from memory to the device.

I really recommend to avoid problems after you modify the bootsector and copy the file:

Source https://stackoverflow.com/questions/48116842

QUESTION

int 13h 42h doesn't load anything in Bochs

Asked 2017-Nov-15 at 08:10

I changed my bootloader from CHS to LBA, so I replaced int 13h 02h with int 13h 42h. It works correctly in QEMU, however, I have troubles running it with Bochs and my laptop.

I wrote bootloader to USB flash drive with dd if=main.bin of=/dev/sdb bs=512. Laptop loads Intel UNDI and gives me the following error: No bootable device - insert boot disk and press any key.

So I tried to debug it with Bochs and noticed that Bochs recognizes this binary file as bootable. However, nothing had been loaded after int 13h executed.

Then I tried to load my old PC from this flash drive, and it works! It loads program and executes it correctly. QEMU gives me the same result.

Here is the bootloader code:

...

ANSWER

Answered 2017-Nov-15 at 08:10

LBA Disk Access Availability

Not all BIOSes support the extended disk read and write functions (although on modern hardware they almost all likely will). Not all BIOSes support extended disk reads of floppies via Int 13h/AH=42h. This is true of BOCHS as well. You can test whether extended disk functions are available on a drive via Int 13/AH=41h/BX=55AAh. This does an extended disk installation check.

If you want to test your code on BOCHS using extended disk reads and LBA you will have to create a hard disk image and modify BOCHS to boot from it instead of floppy. The minimum size hard disk image size that BOCHS supports is one with CHS = 1/16/63 which is 512*16*63 = 516096 bytes or 1008 sectors of 512 bytes each.

You can modify your bochsrc.txt to be:

Source https://stackoverflow.com/questions/43786251

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

Vulnerabilities

No vulnerabilities reported

Install vgabios

To compile the VGA Bios you will need :. Untar the archive, and type make. You should get a "VGABIOS-lgpl-latest.bin" file. Alternatively, you can use the binary file "VGABIOS-lgpl-latest.bin", i have compiled for you. Edit your plex86/bochs conf file, and modify the load-rom command in the VGA BIOS section, to point to the new vgabios image file.
gcc
bcc
as86
ld86

Support

Please report any bugs, comments, patches for this VGA Bios to info@vruppert.de You can find the latest release at : http://www.nongnu.org/vgabios/ For any information on bochs, visit the website http://bochs.sourceforge.net/ For any information on qemu, visit the website http://fabrice.bellard.free.fr/qemu/.

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