[Vm-dev] Compiling squeak.cog.spur on Pi

[tim Rowledge]

> On 24-06-2016, at 11:09 AM, Eliot Miranda <eliot.miranda at gmail.com> wrote:
> 
> 
> Here are useful extracts of messages from Ryan Macnak on the topic.  They imply to me the need for separate v6/Pi and v7/Android builds.
> 
> On Feb 11, 2016, at 7:43 PM, Ryan Macnak <rmacnak at gmail.com> wrote:
> 

> 
> ARM doesn't have great backwards compatibility either. I've tried running an ARMv6 compiled Cog on an ARMv8 board, and it crashes because the VM includes a memory fence instruction that is deprecated and has a replacement in ARMv7 and optionally (and in practice) disabled in ARMv8. So it doesn't look like one can provide a single binary that supports ARMv6-8. Again the embedded systems mentality that one builds for a specific device.
> 

And yet the cog vms for Raspbian work on Pi3 (ARMv8) Pi2 ARMv7 and Pi B (ARMv6)

tim
--
tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
Bayard(n): a person armed with the self-confidence of ignorance