Grub2 Can't find Multiboot header

[RossComputerGuy]

Hey, I'm using grub2 to boot runtime but Grub2 says that it can't find the multiboot header.

[piranna]

Do you know if runtime.js is a multiboot compliant kernel? Have you searched for the multiboot magic number? If not, it would be a good and somewhat easy addition :-)

[piranna]

Ok, it's multiboot compliant. So, when does your error shows up?

[RossComputerGuy]

when multiboot /boot/runtime is executed

[piranna]

Is that a command? How are you executing it?

[RossComputerGuy]

it is, Grub2 boot config source code:

set timeout=10
set color_highlight=black/white
set color_normal=green/black

function graphics() {
    loadfont /boot/unicode.pf2
    set gfxmode=1024x768
    set gfxpayload=keep
    terminal_output gfxterm
}

graphics()

menuentry "ModernOS" {
    loadfont /boot/unicode.pf2
    set gfxmode=1024x768
    set gfxpayload=keep
    terminal_output gfxterm
    multiboot /boot/runtime
    boot
}

[piranna]

How are you trying to exec it, on real hardware? Have you tried to run it on QEmu? It will be easier, you can be able to give it directly a multiboot kernel (I have done it myself in the past, also from scratch). Also, currently runtime.js only have drivers for virtio (virtual) devices...

[RossComputerGuy]

it works on qemu using the rom/kernel option

[piranna]

Ok, so seems it's an issue with Grub2. Have you tried syslinux? It's fairly easier to work with and install, in fact it's what I'm using in NodeOS.

[RossComputerGuy]

not yet

[piranna]

I would stick by the moment with the QEmu -kernel option, but if you are willing to use a bootloader, give syslinux a try ;-)

[RossComputerGuy]

I need help running syslinux to create a disk image from my disk directory

[piranna]

to create the disk image use genfatfs

[RossComputerGuy]

How do I get that command, I dont have it

[facekapow]

You could also use runtime-cli's mkimg to generate a disk:

runtime mkimg --size <how big you want it (e.g. 10G for 10 gigabytes)> --label "MODERNOS" disk.img

[RossComputerGuy]

I found out that Grub2 doesn't have x64 support for non-linux kernels.

[RossComputerGuy]

I can design a bootloader and call it Runtime.js Boot Manager

[piranna]

It's better to fix multiboot support on runtime.js. Example code is easy to understand, don't know why it's not working here...

El 23/6/2017 3:02 AM, "SpaceboyRoss01" notifications@github.com escribió:

I can design a bootloader and call it Runtime.js Boot Manager

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[RossComputerGuy]

running readelf on the kernel outputs: readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

[piranna]

grub accept elf kernels, but not only them... Why don't you try to compile a hello world kernel, like the example one of grub multiboot spec? It's a funny and instructive task :-)

El 23/06/2017 22:38, "SpaceboyRoss01" notifications@github.com escribió:

running readelf on the kernel outputs: readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

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[RossComputerGuy]

I got it to work now

[piranna]

congrats! :-)

El 23/06/2017 22:42, "SpaceboyRoss01" notifications@github.com escribió:

I got it to work now

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