Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [linker]

In computing a linker is a program that takes object files generated by a compiler and performs relocation and other operations to form a final executable. Questions here should only relate to embedded platforms and not general PC programming.

41 questions
10
votes
4 answers

Bare-metal start-up code for Cortex M3 .bss region initialization

I have developed inspired from here a bare metal start-up code for arm cortex M3. However, I encounter the following problem: suppose I declare an uninitialized global variable, say of type unsigned char in main.c #include ... unsigned char var;…
C Marius
  • 229
  • 1
  • 6
8
votes
1 answer

Integrating another binary

I am building a binary for ARM using GCC and Crossworks. I have a secondary binary image that needs to be loaded to another IC during start up. I like to integrate this binary to my tool-chain, in other words, I make this binary part of my image…
Ktc
  • 2,226
  • 3
  • 26
  • 48
7
votes
4 answers

Creating programmable look up table on STM32

I am trying to define a look up table that is not a constant on an STM32F103. Basically I want to have a page of flash that acts like a constant lookup table in normal operation, but every once in a while (think days apart) I want to be able to…
Brett K Smith
  • 305
  • 2
  • 6
6
votes
2 answers

STM32F103 flash memory start address

I'm trying to write a linker script for my first firmware for STM32F103C8T6 microcontroller. I have an example script that works. What I'm trying to understand is why it works. The linker script I have defines two memory locations: MEMORY { …
Andrey Lebedev
  • 183
  • 1
  • 1
  • 5
4
votes
2 answers

Automating linker file change

I am working on a firmware project in which i have to do a crc16 check for flash integrity. Controller: MSP430 IDE: IAR EW 5.40 (Linker Xlink) The crc is calculated using IAR Xlink linker and kept at the end of the flash. Again crc is calculated at…
OnkarK
  • 41
  • 4
4
votes
3 answers

What are the details about link files and startup code one needs to know to write an Operating System for a uC?

I know some people will say I don't need to write an OS because there are lots of options out there. But I'm not interested in using an OS to solve an specific problem. I want to write one by myself to learn how to do it. I know a lot of things…
user49894
4
votes
1 answer

How does gnu linker obtain Cortex-M stack pointer value?

GNU's linker obtains the ARM Cortex's stack pointer value from the linker script, and places that value in the first location of the interrupt vector table. I note that most of my scripts use the symbol _estack to define the "end of stack" (memory…
CMiller
  • 51
  • 4
4
votes
2 answers

Force xc32-ld to place all application code in kseg0_boot_mem

I have written a PIC32MX bootloader application. I would like to tell the linker to put it completely in the boot memory, so that all program space is kept for the final application. Currently, the what I think are the relevant parts of my .ld file…
user17592
3
votes
3 answers

Short String overflows.text area on ATtiny85, Arduino IDE

I'm using the Arduino IDE with arduino-tiny (https://code.google.com/p/arduino-tiny/) on an ATTIny85. My code is maxing out the RAM, or so it seems: Adding a single String to my code, even just carrying one character, throws a compiler…
Christian
  • 621
  • 12
  • 22
3
votes
0 answers

How can I setup a shared library between a bootloader and an application?

I am in the process of implementing over-the-air updates on a CC2652 microcontroller using the OpenThread stack. As far as I know a bootloader has to be able to operate independently from the application and be as small as possible. But for the…
Vincent Kenbeek
  • 193
  • 9
3
votes
1 answer

gcc __attribute__ section not working?

I'm working on a Zynq Ultrascale+ MPSoC and trying to play around with the on and off chip memories. In the following program, I'm trying to place only variable 'x' into OCM (on-chip-memory) where everything else is loaded into external…
pr871
  • 1,167
  • 10
  • 23
3
votes
2 answers

How does avr-gcc linker know to put the `.data`section at `0x800100` rather than `0x800060`?

Looking at the linker script for my part (ATMEGA168PD), the data region has an origin defined as starting at 0x800060... MEMORY { text (rx) : ORIGIN = 0, LENGTH = __TEXT_REGION_LENGTH__ data (rw!x) : ORIGIN = 0x800060, LENGTH =…
bigjosh
  • 9,888
  • 29
  • 48
3
votes
2 answers

IAR ARM Place const symbols in flash

I have the following flash section defined in my linker file: keep { section .SomeConst }; place at address mem: 0x0003F800 { readonly section .SomeConst }; In my code I have the following symbols defined: #pragma location = ".SomeConst" __root…
BAO
  • 78
  • 1
  • 5
2
votes
2 answers

Arduino linking assembler funtions

I would like to use (link) a function written in assembler in an Arduino project. What I want to do is: write the function in assembler using avr-gcc calling conventions declare the function as extern in the .ino file provide the instructions and…
Stefan Nilsson
  • 41
  • 3
2
votes
1 answer

ELF section flags not picking up flags from linker script

In my linker script for binaries on an MSP430, I have a memory section marked "rx": MEMORY { ROM (rx) : ORIGIN = 0x4400, LENGTH = 0xb000 /* END=0xF3FF, size 45056 */ } Despite this, readelf gives me: [ 2] .rodata PROGBITS …
jhnphm
  • 31
  • 3
1
2 3