A bit confused with linkng the bootloader and kernel

[kr651129]

So I'm new to this and I'm trying to do the Basic C kernel tutorial. I executed the following

Code: Select all

nasm -f aout kernel_start.asm -o ks.o
gcc -c kernel.c -o kernel.o
ld -T link.ld -o kernel.bin ks.o kernel.o

Here's my question, how do I load this on my disk so it will boot?!

Code: Select all

sudo dd if=kernel.bin of=/dev/sdb bs=512 count=1

Didn't work, I've tried everything else and can't seem to get anywhere

[Muneer]

You specified "count = 1" which only copies one block(the first) and "bs = 512" means each block is 512 bytes. So you end up writing only the bootloader to your /dev/sdb and not your kernel.

[kr651129]

So would I need to say count=2 and bs=1024 to get this to work correctly and still be bootable?

[eryjus]

Here's my question, how do I load this on my disk so it will boot?!

Code: Select all

sudo dd if=kernel.bin of=/dev/sdb bs=512 count=1

Didn't work, I've tried everything else and can't seem to get anywhere

Your command will write your linked file (kernel.bin) to your second hard drive (sdb) in the Master Boot Record (MBR). When you say it didn't work, the error message would help us help you. I would bet you do not have 2 hard disks.

Try:

Code: Select all

sudo dd if=kernel.bin of=disk.bin bs=512 count=1

which will create a disk file to use with an emulator like QEMU or

Code: Select all

sudo dd if=kernel.bin of=/dev/fda bs=512 count=1

which will write to floppy disk A.

[Brendan]

Hi,

Your command will write your linked file (kernel.bin) to your second hard drive (sdb) in the Master Boot Record (MBR). When you say it didn't work, the error message would help us help you. I would bet you do not have 2 hard disks.

Unfortunately, modern Linux likes to pretend that lots of devices are SCSI, including everything that isn't SCSI (e.g. SATA, USB flash, USB external hard drives, etc). This is done to confuse the unsuspecting user, and to increase the chance of the same device name refers to completely different devices at different times.

So I'm new to this and I'm trying to do the Basic C kernel tutorial. I executed the following

Code: Select all

nasm -f aout kernel_start.asm -o ks.o
gcc -c kernel.c -o kernel.o
ld -T link.ld -o kernel.bin ks.o kernel.o

Why would anyone want to link a kernel with a boot loader in the first place?


Cheers,

Brendan

[Combuster]

Have you read (and done) everything your tutorial reference has to say on GRUB? The way the compilation instructions are listed I have to assume you haven't done anything on the bootloader side (that besides the fact that you have a pretty bad tutorial for recommending a.out and no GCC Cross-Compiler).