This page collect the trouble shooting on toolchain.
GCC Toolchains
There are several gcc toolchain releases, including (suppose little endian, softfloat)
| Vendor | Machine Word | Bare Metal | Linux Userspace | Link |
|---|---|---|---|---|
| Linaro | 32 | arm-none-eabi- | arm-linux-gnueabi- | http://releases.linaro.org/latest/components/toolchain/binaries |
| Android | 32 | arm-eabi- | arm-linux-androideabi- | https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/ |
Note 1: Bare Metal toolchain is for some tools without libc, say bootloader, firmware.
Note 2: for Linaro's toolchain, if the code isn't written in good way, it would get problem.
Wrong Way:
void foo(void)
{
uint8_t data8[32] = {0}; /* won't enforce data8[] to start as machine word
* aligned, so it may start as 0x00001003 */
uint32_t *p32 = (void *)data8; /* error: can't do in this way, it may get data
* abort due to alignment issue */
*p32 = 10; /* warning: this may get data abort!!!
* happens on linaro bare-metal toolchain */
}
Right Way:
void foo(void)
{
uint32_t data32[8] = {0}; /* declear it as 32-bit types */
uint32_t *p32 = data32;
*p32 = 10;
}