On Tue, Jun 02, 2020 at 05:40:39PM +0200, Daniel Kolesa wrote: > > > On Tue, Jun 2, 2020, at 17:27, Michal Suchánek wrote: > > On Tue, Jun 02, 2020 at 05:13:25PM +0200, Daniel Kolesa wrote: > > > On Tue, Jun 2, 2020, at 16:23, Michal Suchánek wrote: > > > > On Tue, Jun 02, 2020 at 01:40:23PM +0000, Joseph Myers wrote: > > > > > On Tue, 2 Jun 2020, Daniel Kolesa wrote: > > > > > > > > > > > not be limited to being just userspace under ppc64le, but should be > > > > > > runnable on a native kernel as well, which should not be limited to > > > > > > any > > > > > > particular baseline other than just PowerPC. > > > > > > > > > > This is a fairly unusual approach to bringing up a new ABI. Since > > > > > new > > > > > ABIs are more likely to be used on new systems rather than switching > > > > > ABI > > > > > on an existing installation, and since it can take quite some time > > > > > for all > > > > > the software support for a new ABI to become widely available in > > > > > distributions, people developing new ABIs are likely to think about > > > > > what > > > > > new systems are going to be relevant in a few years' time when > > > > > working out > > > > > the minimum hardware requirements for the new ABI. (The POWER8 > > > > > minimum > > > > > for powerpc64le fits in with that, for example.) > > > > That means that you cannot run ppc64le on FSL embedded CPUs (which lack > > > > the vector instructions in LE mode). Which may be fine with you but > > > > other people may want to support these. Can't really say if that's good > > > > idea or not but I don't foresee them going away in a few years, either. > > > > > > well, ppc64le already cannot be run on those, as far as I know (I don't > > > think it's possible to build ppc64le userland without VSX in any > > > configuration) > > > > What hardware are you targetting then? I did not notice anything > > specific mentioned in the thread. > > > > Naturally on POWER the first cpu that has LE support is POWER8 so you > > can count on all other POWER8 features to be present. With other > > architecture variants the situation is different. > > This is not true; nearly every 32-bit PowerPC CPU has LE support (all the way > back to 6xx), these would be the native-hardware targets for the port (would > need kernel support implemented, but it's technically possible). I find dealing with memory management issues on 32bit architectures a pain. There is never enough address space. > > As far as 64-bit CPUs go, POWER7 is the first one that could in practice run > the current ppc64le configuration, but in glibc it's limited to POWER8 and in > gcc the default for powerpc64le is also POWER8 (however, it is perfectly > possible to configure gcc for POWER7 and use musl libc with it). That's interesting. I guess I was tricked but the glibc limitation.
Thanks Michal
