[Buildroot] [git commit branch/2021.02.x] Config.in: disable PIC/PIE for Nios2

From: Peter Korsgaard

Sent: 10 June 2021 16:06

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"David" == David Laight [off-list ref] writes:

Hi,

 >> Recently in Buildroot the option BR2_PIC_PIE has been enabled by default along
 >> with other hardening features [1]. Since then the nios2 defconfig
 >> qemu_nios2_10m50_defconfig is failing to boot due to a segfault in init program:

 > You probably just don't want to enable PIE for nios2 at all.

Notice that this commit was about disallowing PIE for nios2.

Indeed, but maybe you want a stronger note that you really
don't want any of the 'hardening' features on such a slow processor.

...

Yes, I also cannot recommend people using nios2 (or microblaze for that
matter) for Linux systems.

Never mind Linux, I don't think I'd even run VxWorks.
We have about 4 instructions to set up %sp and then jump
straight to the C code loop.
No os, no libc, no nothing, just a code loop.

The one that does 64 channels of 64k hdlc (for SS7) running
at 62.5MHz doesn't ever write to the stack.
I did 'cheat', there are some custom instructions for the
bitstuffing and abort/flag detection.

	David

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