Is there anything that the kernel need to get from the boot loader.Usually the kernel is capable of bringing up a system from scratch,so why does it require anything from boot-loader? I have seen boot messages from kernel like this. "Fetching vars from bootloader... OK" So what exactly is the variables being passed? Also how's the va...
Preferably well comment and with some associated docmentation and a Makefile. Just for clearity, that's the less than 512 bytes (512 bytes - partition table) of machine code that gets loaded by the Bios and is responsible for chaining to the secondary bootloader in your boot partition. Edit: Both David's and bdonlan's answers look prom...
I am writing a program, more specifically a bootloader, for an embedded system. I am going to use a C library to interact with some of the hardware components and I have the choice of writing it either in C or C++. Is there any reason I should choose one over the other? I do not need the object oriented features of C++ but it does have a...
I'm trying to boot Linux on a GPS device from a SD card. I have found some informations about the device on Internet and apparently it's possible to load a customized Windows CE. To achieve this, they use a boot loader file that has the extention ".bld" I extracted the ISO of Ubuntu MID on the SD card, but there is no files with a bld...
It's been a while since I did any ASM, and decided to once again try and write a small bootloader, testing with qemu. My issue is with interupt 13, for some reason the carry flag is being set, so the read is failing. Currently, my disk image looks like: 512 Byte BootLoader <- This (as far as I'm aware) Is block 0 in LBA Main Function <...
Can I run some some custom code at the time when GRUB loads up? In other words does GRUB provide a facility to run some custom code before loading any operating system? ...
Where can I find resources/tutorials on how to implement threads on a x86 architecture bootloader... lets say I want to load resources in the background while displaying a progress bar.. ...
I have an embedded hardware system which contains a bootloader based on ARMboot (which is very similar to Uboot and PPCboot). This bootloader normally serves to load uClinux image from the flash. However, now I am trying to use this bootloader to run a standalone helloworld application, which does not require any linked library. Actuall...
I am trying to print character from boot loader using code [BITS 16] ;Tells the assembler that its a 16 bit code [ORG 0x7C00] ;Origin, tell the assembler that where the code will ;be in memory after it is been loaded MOV AL, 65 CALL PrintCharacter JMP $ ;Infinite loop, hang it here. PrintCharacter: ;Procedure to print...
I have a simple bootloader, which initializes and prepares SDRAM. Then it loads an application from the Flash and starts it at some address in the RAM. After the application has finished its execution, the system does restart. There is no system stack. Now, I would like this bootloader receives control back after an application finished...
Why does bios read at partition's boot record at 0000:7c00 ? What is special about that address ? what ':' doing in referencing an address ? ...
I have written simple first stage bootloader which displays "Hello world" using interrupt to bios. Now as a next obvious step to write a second stage, but where code for that should exist and how to load it from first stage ? Here is a program for first stage [BITS 16] ;Tells the assembler that its a 16 bit code [ORG 0x7C00] ;Orig...
The linux kernel uses a kind of ram disk to access modules at an early boot stage. Out of curiosity I want to understand I have a question: The file containing the initramfs/initrd must be accessible for the kernel at this stage. This means the kernel must have support for the appropriate filesystem. So why couldn't the content of the in...
I've already done a part of my OS in Assembly, but now I want to build a own bootloader for it too instead of using GRUB. When I was developing my test OS in Assembly I remember that I boot it like this: org 0x7c00 bits 16 ; OS Kernel Here times 510 - ($-$$) db 0 dw 0xAA55 This I've already know. Now I want to use this and execute t...
I set-up the Kamikaze toolchain (from openwrt), and compiled Linux 2.6.30.x kernel for an AMCC PPC405ex kilauea reference board. However, for some reason I am doing something wrong in uBoot, as I am not able to run the kernel from an squashfs image. The image loads fine over tftp and uncompresses, but the console output does not start. ...
I'm learning MIPS Assembly by the book MIPS Assembly Language Programming, but my I've just started learning MIPS because I want to build a MIPS OS, but now as I can see, there isn't many documentation(I that isn't any) talking about boot and these things. Then I'm asking here for someone that have already done this to point me at the ri...
I am trying to enable wireless programming of an Arduino via the XBee Shield and an XBee Explorer. I've seen two tutorials online that show you how do it. However, both tutorials talk about using components to connect the receiver XBee to the Arduino. Well the XBee shield handles the communication between the receiver XBee and the Arduin...
I want to use mouse from a boot loader, but the int33h is not working, (DOS interrupt, and there is no DOS booting),so can you help me, how can I read the mouse position, status, etc without using int33h? Thanks ...
s3c44b0x does not support flash breakpoint(unlike other processors such as lpc1758 which has on-chip flash), then how to debug bootloader when it still runs in the flash? ...
Hi All Is there any way in Linux to read Boot Configuration Data(BCD) used by Microsoft Windows Boot Manager? Regards, ...