ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<Forty-Bot>
milkylainen: sorry, I've only tinkered with a PJ1 :P
<milkylainen>
Yeah. I know. Probably just public documents. I'm reading from MV-S108492. Armada XP MPCore. Says in a bunch of footnotes that it has a neon unit, but without the simd part. Ie, only vfp.
<arnd>
IIRC armada xp has PJ4B-MP with only vfpv3-d16, armada 1500 (Berlin) has both neon and iwmmxt, armada 600 (MMP2) has only iwmmxt. I think mmp3 has only neon, but I don't have any references for that
<milkylainen>
arnd: yeah. the armada-xp pj4b-mp description is what I understand from it too.
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<milkylainen>
I came to a cortex-a9+nosimd as closest. But don't really know.
<arnd>
not sure if that has d16 or d32. In gcc you want -march=armv7-a+vfpv3-d16 to limit the number of dp register to 16. This is the default on all major distros anyway
<milkylainen>
I think it's d32, but dunno if anyone uses it.
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<arnd>
I don't really care about the LED portion, just take them.
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<ukleinek>
milkylainen, arnd: I still have an armada 370 at home. I could provice /proc/cpuinfo later (or similar things) if you're interested.
<milkylainen>
ukleinek: I have one of marvells mishmash devices too. I think my biggest question is what to make of the PJ4B with regards to optimization, if a -mcpu=cortex-a9 target would make any difference etc.
<ukleinek>
milkylainen: mine runs debian armhf
<milkylainen>
ukleinek: so probably a basic march armv7-a with vfp then, no tunes. As arnd said.
<milkylainen>
?
<ukleinek>
milkylainen: sounds about right, armhf = armv7 with thumb2 + vfp3d16
<milkylainen>
ukleinek: I think the pj4b mpcore has +mp too. But never used that and don't know if anything makes use of it.
<milkylainen>
bbl
<arnd>
milkylainen: gcc has -mtune=marvell-pj4
<milkylainen>
pj4 is similar to? cortex-a8?
<ukleinek>
arnd: thanks for taking the bus platform conversion patch
<ukleinek>
and the soc one
<arnd>
milkylainen: it's an out-of-order core, so more like a9. Nothing is really like an a8, that was a weird one
<milkylainen>
arnd: good to know. I was under the impression that pj4 was similar to a8 and pj4b to a9.
<arnd>
milkylainen: the earlier armv5 cores ("pj1" and others) came in multiple variations ranging from single-issue in-order to multi-issue out-of-order, so the mv78xx0 SoC had two armv5 cores that were a lot like pj4 but did not support SMP or ARMv7
<arnd>
pj1 was clearly meant to compete with cortex-a8 on performance, but with a different set of tradeoffs
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