On my previous post I discussed some stats using Buildroot toolchain to build Nuttx. Today I’ll add the necessary steps to build on Ubuntu. Ubuntu is de-facto GNU/Linux distribution (although I’m Gentoo user) and many users, from different areas, uses it [they are not necessary command line experts] so I decided to publish my raw [...]
I was following this thread on Nuttx maillist on recommended compiler to build Nuttx RTOS. As a matter of practicality I guess that many users use CodeSourcery arm-none-linux-gnueabi but today I decided test the code generated for Cortex-M3 (LPC1768) using the toolchain from Buildroot. As Greg Nutt said (text adapted):
They were configured using OABI [old arm ABI], but [...]
Just a small tip to test code generated for ARM Cortex-M3 using QEmu:
$ arm-none-eabi-gcc main.c -ggdb -mcpu=cortex-m3 -mthumb -T generic-m-hosted.ld
$ qemu-arm -cpu cortex-m3 ./a.out
You can download Code Sourcery toolchain here and QEmu here (also available from package management system of your favorite Linux distribution). Just unpack the toolchain associating the arm-201XqX/bin with your $PATH and run qemu.