I am not sure if I got it right.
The linker is only involved until the .elf file has been created.
If the question is to pad out the content of the .hex file so it is one
continuous block then it can be done with :
avr-objcopy -j .text -j .data -j .my_signature --gap-fill 0xFF -O ihex
On 1/19/2022 10:05 AM, Michael Kwasnicki wrote:
I am not sure if I got it right.
The linker is only involved until the .elf file has been created.
If the question is to pad out the content of the .hex file so it is
one continuous block then it can be done with :
avr-objcopy -j .text -j .data
On 1/19/2022 7:13 AM, Michael Stocker wrote:
You are right.
-Wl,--undefined=signature
This will keep it in flash and not let the linker strip its value.
Also when preparing your .hex file for flashing you may need to
explicitly tell the sections you want.
avr-objcopy -j .text -j .data -j
Hi,
-Wl,--undefined=signature
This will keep it in flash and not let the linker strip its value.
Also when preparing your .hex file for flashing you may need to
explicitly tell the sections you want.
avr-objcopy -j .text -j .data -j .my_signature -O ihex prog.elf
prog.hex
works perfect!
I recommend creating the section in the linker file. It is often easier
for the next guy looking at your code to find the section in the linker
file.
That is, embedded development follows a path, from writing code to make it
work, to making it work reliably, to making it where the next guy can
Thanks for the linker command! I was not aware that we are able to
define a section and put the content to flash by simply adding something
on the linker command. Is there no need to tell the linker that this
section should be kept as it is typically not referenced and "optimized"
out?
Thanks!
You are right.
-Wl,--undefined=signature
This will keep it in flash and not let the linker strip its value.
Also when preparing your .hex file for flashing you may need to explicitly tell
the sections you want.
avr-objcopy -j .text -j .data -j .my_signature -O ihex prog.elf
Hallo Klaus,
you can always define your own sections at a fixed location in flash and write
anything you like in there.
But every time you start a new section the previous one is closed implicitly.
So it cannot be in the middle of another section.
It also cannot go at the beginning of flash
Hi,
is there already a defined wy to place a user defined signature in the
flash memory?
Use Case: Simply put some version info, maybe a a string with given
format or a git hash id or whatever in a specified flash area.
I see we have a section ".signature" but this is in use for a predefined
3
