Help with compiling for qemu ARM cortex m3



I tried to compile my sample application code for the target
BOARD ?= qemu_cortex_m3

It compiles for qemu_x86 however for qemu_cortex_m3 it gives me errors related to SRAM overflowed.

$zephyr-sdk/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-zephyr-eabi/gcc/arm-zephyr-eabi/6.2.0/real-ld: zephyr_prebuilt.elf section `noinit' will not fit in region `SRAM'
$zephyr-sdk/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-zephyr-eabi/gcc/arm-zephyr-eabi/6.2.0/real-ld: section .intList VMA [0000000020010000,0000000020010043] overlaps section noinit VMA [000000002000d5a0,000000002002413b]
$zephyr-sdk/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-zephyr-eabi/gcc/arm-zephyr-eabi/6.2.0/real-ld: region `SRAM' overflowed by 82236 bytes
collect2: error: ld returned 1 exit status
$zephyr/Makefile:878: recipe for target 'zephyr_prebuilt.elf' failed

I test with the recent zephyr version (master branch).
In dts/arm/ti/lm3s6965.dtsi the SRAM for qemu_cortex_m3 defined is 64 KB.

I can manage to compile for qemu_cortex_m3  by increasing the value of SRAM from 64 KB to 128 KB in

sram0: memory@20000000 {
        device_type = "memory";
        compatible = "mmio-sram";
        reg = <0x20000000 (64*1024)>;    

However, I want to test with the same
SRAM value as in real hardware (e.g., eventually I want to test with KW41Z board). So instead of increasing the current SRAM value, I would rather modify proj.conf.
Could someone please tell me what would be the right approach to address this issue of SRAM overflow for qemu ARM ?


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