Simple Kernel Loading Isse

Yuan Feng

Hi Everyone,

I wrote a simple kernel which is unix-based. How can I use upboard to boot with this OS image.

Could any one tell me the steps?

Many Thanks

DCleri

Hi Michael,

The question is very generic and the step may vary depending on the distribution you are using.

Is it a Unix or Linux system?
Does it support EFI boot?

Yuan Feng

Hi,

Yes, I support EFI. I put this on my thinkpad notebookt and it works. Thinkpad is sandybridge chip.

Linux system based.

Yuan Feng

The solution I use is

add the following to /boot/grub/grub.cfg on ubuntu
menuentry ' '{
multiboot /boot/kernel....
}

It works on my thinkpad, but does not work on up board. It cannot display anything.

Yuan Feng

The code I am using is similar to this
"
const char *str = "my first kernel";
char *vidptr = (char*)0xb8000; //video mem begins here.
unsigned int i = 0;
unsigned int j = 0;

while(j < 80 * 25 * 2) {
/* blank character */
vidptr[j] = ' ';
vidptr[j+1] = 0x07;
j = j + 2;
}

j = 0;

/* this loop writes the string to video memory */
while(str[j] != '\0') {
vidptr = str[j];

vidptr[i+1] = 0x07;
++j;
i = i + 2;
}
return;
"

DCleri

Hi michaelyuanfeng,

If you are compiling a custom kernel for ubuntu I would suggest to start from our kernel on launchpad: https://launchpad.net/~ubilinux/+archive/ubuntu/up

Also, to simplify the installation of the new kernel you should try to compile with the option to create a deb package.
You can then easily install with dpkg your new kernel from a ubuntu 14.04/16.04 system already installed in the UP board.