region RAM overflowed with stack

You can either check whether there are unnecessary global data and remove them, or adapt the RAM section a little bit larger to provide room for your data.

The stack was set to 0xc00, but I've only got 4K of memory..

What is a reasonable stack to use with newlib-nano?

I don't have exact number for your question. Yet if your program doesn't have floating point io, I would expect 512bytes~1024bytes with newlib-nano. But the stack consumption depends on your application, you should do some experiments to get an accurate number for your application.

One question is:
By setting stack to 0xc00, do you mean that you reserve 1K bytes for stack?

Thanks.

0xc00 is what was in the startup_ARMCM0.S which was delivered with your tools...

Isn't that 3K?

Sorry that I barely touched startup_ARMCM0.S before, but the previous words still stand, you can do some experiments to get a reasonable size for stack.

Thanks.

Can you review this with the developer?

How much stack is needed if I enable float?

Definitely larger than 512 bytes, but 1024bytes might work. Again I haven't verified this, you have to verify it with your application.

Thanks.

Hi,

It appear to me that you reserved too big stack. The startup code by
default reserves 3k for most of user. But that need to be set correct for
you own board. Please try -D__STACK_SIZE=0X800 or even smaller. Printf of
nano need only about 2k RAM

THANKS
Joey
On Jul 18, 2013 10:38 AM, "ilovefpv" <email address hidden>
wrote:

> New question #232629 on GCC ARM Embedded:
> https://answers.launchpad.net/gcc-arm-embedded/+question/232629
>
> Added some new code to my routine and got:
>
> C:\project\ezarm>arm-none-eabi-gcc c:\project\ezarm\src\thermometer.c
> c:\project
> \ezarm\lib\startup\startup_ARMCM0.S -mthumb -mcpu=cortex-m0
> -D__STARTUP_CLEAR_BS
> S -D__START=main -Os -ffunction-sections -fdata-sections -g
> --specs=nano.specs -
> lc -lc -lnosys -Ic:\project\ezarm\lib -Lc:\project\ezarm\lib\ldscripts -T
> c:\pro
> ject\ezarm\lib\gcc.ld -Wl,--gc-sections
> -Wl,-Map=c:\project\ezarm\out\thermomete
> r.map -g -o c:\project\ezarm\out\thermometer-CM0.axf
> c:/program files (x86)/gnu tools arm embedded/4.7
> 2013q2/bin/../lib/gcc/arm-none
> -eabi/4.7.4/../../../../arm-none-eabi/bin/ld.exe: region RAM overflowed
> with stack
> collect2.exe: error: ld returned 1 exit status
>
> I didn't think I was that full yet... What can I do to fix this?
>
> --
> You received this question notification because you are an answer
> contact for GCC ARM Embedded.
>