On Mon, Aug 5, 2013 at 4:51 PM, Alex Villacís Lasso
<a_villacis(a)palosanto.com> wrote:
I have read that Fedora 18 will be the last Fedora distribution that
will
support the armv5tel userspace. I am a bit worried because I have built a
project using the distribution on an armv5tel CPU with custom-built kernels.
From reading
https://fedoraproject.org/wiki/Architectures/ARM/Secret_Decoder_Ring I
understand that the main difference between armv5tel and armv7hl is that
armv5tel forces passing floats on the stack and armv7hl uses the FPU. I was
thinking about the possibility that a CPU model that might have a FPU and
currently runs an armv5tel userspace might be updated to run armv7hl
instead. The end goal is to make the armv5tel system run the Fedora 19
armv7hl userspace with the custom-built kernel.
1) In /proc/cpuinfo, I have seen the "vfp" flag. Does this stand for
"vector
floating point", a FPU? Could there be other kinds of FPU that might be
reported as different flags?
2) If an ARM chipset that is officially armv5tel can be guaranteed to have a
FPU (vfp or otherwise), can it boot an armv7hl userspace with the same
custom-built armv5tel kernel it used before? Do I have to watch out for
specific kernel compile options before attempting this?
Unlikely as we optimise for VFPv3 and ARMv5tel only had either v1 or
v2 (don't remember which) and I believe architecturally there's quite
a difference between them.
Peter