Re: initial porting of IPIPE x86_64 patches onto Linux stable 5.4.52

[Steven Seeger <steven.seeger@flightsystems.net>]

On Tuesday, August 25, 2020 9:25:00 AM EDT Lennart Sorensen wrote:
> A 5020 is an e5500, which is nothing like an e500.  The e500 is PowerpC
> SPE, while the e5500 (and the e300, e500mc and e6500) are "real" PowerPC
> instead with a somewhat different instruction set.

Sorry e500 was a typo in that case.

> GCC 9 even dropped support for the PPC SPE, while PPC is fully supported.
> 

Yeah there are e500 boards being made for military, aerospace, and LEO (low earth orbit) 
uses. There is concern that gcc 9 dropped SPE support, but it's up to vendors to support 
maintenance of it.

> 
> The e500's existence offends me since it fragments the powerpc
> architecture.  Yuck. :)

Well I won't say anything good or bad about it, but it's the one I know the most since it's 
what I work with all the time. ;)

The worst thing I ever had to deal with was making changes to a 603 instruction set 
simulator to make it be a 601. The subtle differences between POWER and PowerPC ISAs 
were quite a pain to find at the time. This was years ago.

But yeah all my work (and tested support with xenomai) have been on a e500v2. (8548)

Steven