Re: Cortex-A53 GCC erratum compiler options

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

On Thu, 26 Sep 2019 08:14:32 +0100
Sad Clouds <cryintothebluesky%gmail.com@localhost> wrote:

> Hello, GCC for AArch64 has the following compiler options to work
> around Cortex-A53 CPU bugs. I assume they are not enabled by default
> by GCC.
> 
> Anyone knows if these options should always be enabled when building
> software for this CPU? If yes, does NetBSD already enable them for
> kernel and userland programs? If it doesn't, then should it?
> 
> 
> -mfix-cortex-a53-835769
> -mno-fix-cortex-a53-835769
> Enable or disable the workaround for the ARM Cortex-A53 erratum number
> 835769. This involves inserting a NOP instruction between memory
> instructions and 64-bit integer multiply-accumulate instructions.
> 
> -mfix-cortex-a53-843419
> -mno-fix-cortex-a53-843419
> Enable or disable the workaround for the ARM Cortex-A53 erratum number
> 843419. This erratum workaround is made at link time and this will
> only pass the corresponding flag to the linker.


OK found them, looks like they are enabled by default in NetBSD GCC
compilers for AArch64, as can be seen with "gcc -v" output.