Thread: Anyone any experience uploading bootloaders using C

Below is my code without the "printf"-output code to check progress. I checked and it says that it writes the data.

When I read back the result with a similar program, although it seems to have written the bootloader successfully at first, it returns all zeroes with the read program.

I did make sure I have root permissions. I have the size of the program instead of PROGRAM_SIZE and the filename of the bootloader instead of "bootloader."

I can't really tell whether there's something wrong with my programming or some kind of interference by the Operating System.

Code:

#include <stdio.h>


unsigned char uca_CMOS[PROGRAM_SIZE] __attribute__((section(".ARM.__at_0x0000000000000000")));
unsigned long int uli_counter = 0;
FILE * Fp_load;


int main(int i_argc, char** cpa_argv) {
  if (Fp_load = fopen("bootloader", "r")) {
    while (!feof(Fp_load)) {
      uca_CMOS[uli_counter] = getc(Fp_load);
      uli_counter++;
    }
    fclose(Fp_load);
  }
}

I'm not sure how the compiler you're using is interpreting __attribute__.

At first glance, maybe it's writing to a 0x0000000000000000 memory address.

Originally Posted by entrocraft

I'm not sure how the compiler you're using is interpreting __attribute__.

At first glance, maybe it's writing to a 0x0000000000000000 memory address.

The __attribute__ option should allow me to specify specific attributes of variables. The intent, as you identified it correctly, is to write to the absolute zero address, so when I reboot my computer the program it finds to boot up is the one I put there. I mean to upload my own bootloader.

My main problem is that I have a lot of Bluetooth interference with pause, shutdown, kill, and block commands blocking my actions. This quite frequently leads to hardware tests not getting to or beyond 92% instead of testing a full 100% on other computers.

My MacBook has been taken hostage by the DarkWeb and I've taken down a lot of their servers. I can tell my Internet is opening up and becoming less moderated, but I'm not quite there yet. As soon as I am, I'm going to put a lot of work into designing my own operating system ground up that doesn't allow for any of this.

Originally Posted by Emile Michel

The __attribute__ option should allow me to specify specific attributes of variables. The intent, as you identified it correctly, is to write to the absolute zero address, so when I reboot my computer the program it finds to boot up is the one I put there. I mean to upload my own bootloader.

My main problem is that I have a lot of Bluetooth interference with pause, shutdown, kill, and block commands blocking my actions. This quite frequently leads to hardware tests not getting to or beyond 92% instead of testing a full 100% on other computers.

My MacBook has been taken hostage by the DarkWeb and I've taken down a lot of their servers. I can tell my Internet is opening up and becoming less moderated, but I'm not quite there yet. As soon as I am, I'm going to put a lot of work into designing my own operating system ground up that doesn't allow for any of this.

Hmmm, i was kind of confused by your post, but now i am starting to understand your intent with posting here now...

Originally Posted by C_me_run

Hmmm, i was kind of confused by your post, but now i am starting to understand your intent with posting here now...

Sorry. I should have been a bit more specific in the post itself. It's easy to overlook the title. I also do it when I read it back.