Simple Kernel Loading Isse
Yuan Feng
New Member Posts: 5 ✭
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
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
Comments
-
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? -
Hi,
Yes, I support EFI. I put this on my thinkpad notebookt and it works. Thinkpad is sandybridge chip.
Linux system based. -
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. -
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;
" -
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.
