Re: Early boot debigging

Hello, thank you for reply,

yes, previously my plan was grub2 + vmlinuz/initrd + qemu.

I built disk with following instructions:

dd if=/dev/zero of=disk.img count=163840 bs=4096
fdisk fdisk (created one partition)
sudo losetup /dev/loop0 disk.img
sudo losetup /dev/loop1 disk.img -o 1048576
sudo mke2fs /dev/loop1
sudo mount /dev/loop1 /mnt
sudo grub-install --root-directory=/mnt --no-floppy --modules="normal
part_msdos ext2" /dev/loop0

Than i copied vmlinuz and initrd from my /boot directory to /mnt/boot
and created grub.cfg for grub:
and Added to the /mnt/boot/grub/grub.cfg following:

menuentry "My custom Linux" {
        set root=(hd0,1)
        linux /boot/vmlinuz-3.18.0-rc4+ root=/dev/sda1
        initrd /boot/initrd.img-3.18.0-rc4+
}

And reinstalled grub with previous command. Now i'm trying to run it
in qemu with:

qemu-system-x86_64 disk.img

I see grub menu, but after pressing on it only black screen without
any errors/logs and etc: http://tinypic.com/r/i2pugh/8

Can't understand what's wrong here

Thank you.

2014-11-29 14:35 GMT+06:00 Guoqing Liu <[email protected]>:
> Hi  Alexander
>   I think  you can try qemu, I think it's better.
>
> good luck.
>
> On Sat, Nov 29, 2014 at 2:41 PM, Alexander Kuleshov
> <[email protected]> wrote:
>> Hello all,
>>
>> How can i debug early kernel booting, even before early_printk
>> (x86_64). I'm interesting in part which starts to execute right after
>> bootloader (https://github.com/torvalds/linux/blob/master/arch/x86/boot/header.S#L297).
>> How to do it better? Write grub and vmlinuz to disk with
>> losetup/grub-install and connect with gdb, or there is something
>> another way to do it?
>>
>> Thank you.
>> --
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>
>
>
> --
> good life



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