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copy / v86

x86 PC emulator and x86-to-wasm JIT, running in the browser
https://copy.sh/v86/
BSD 2-Clause "Simplified" License
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Boot order issue with hard drive disk image and CD image #225

Open rwv opened 6 years ago

rwv commented 6 years ago

I would like to boot freedos on hard disk image and use an iso file as a data drive. However, I encounter some strange behavior of the boot-order options. When both hard disk image and CD image are included. The hard drive boot entry will always be the last boot entry no matter the settings of boot order. After more tests, it seems that if the CD image is include, the other two boot entry will be "disabled".

Order tables (with three entries both selected):

Description boot_order First Second Third
Hard Disk / CD / Floppy 0x132 CD Floppy hard disk
Hard Disk / Floppy / CD 0x312 Floppy (always fail) CD hard disk
Floppy / Hard Disk / CD 0x321 Floppy (always fail) CD hard disk
Floppy / CD / Hard Disk 0x231 Floppy (always fail) CD hard disk
CD / Hard Disk / Floppy 0x123 CD Floppy hard disk
CD / Floppy / CD 0x213 CD Floppy hard disk

disk image files (upload to mega.nz because file size exceeds GitHub limits)

copy commented 6 years ago

Indeed, configurations with both CD and HDD are haven't been tested much.

I don't really have the time or energy to fix this, so contributions are very welcome.

markostamcar commented 6 years ago

Oh man, this bug really bums me out. It seems that using all 3 boot media types at the same time makes the boot fail completely.

I don't know much about coding an emulator but I did take a look at .js files and couldn't find anything like a bug in parsing boot media configuration etc... maybe it's a bug in the BIOS?

@rwv did you make any progress? @copy what kind of bribe would tempt you to look into it - a beer, 6 beers, 24 beers? :D

rwv commented 5 years ago

@markostamcar nope, i haven't made any progress.