ARMv8-a profile

EliasJonsson · n00b Joined: 18 Oct 2017 Posts: 53

Raspberry Pi 3B+ and Raspberry Pi 4B both support ARMv8-a but the latest stage3 and system profile is only ARMv7-a. Does any one have a clue on when we get to see the ARMv8-a instruction set supported?

NeddySeagoon · Posted: Sun Aug 04, 2019 9:49 am Post subject:

EliasJonsson,

The armv8a profiles are still experimental, so the stage3 is under experimental too.
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NeddySeagoon

Computer users fall into two groups:-
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Goverp · Advocate Joined: 07 Mar 2007 Posts: 2244

I see announced that the Arm64 profile is now stable.
Does that mean there's now an "official" Gentoo for Raspberry pi 4, or is there more to come/more needed?
Or is this something else entirely?
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Greybeard

NeddySeagoon · Posted: Mon Aug 12, 2019 4:40 pm Post subject:

Goverp,

The arm64 stage3 has worked on 64 bit Raspberry Pi for a long time, so has lots of other user space.
Many things that are not keyworded for ~arm64 as just not tested, so nobody knows.

The kernel is quite different. The 64 bit Pis are a 32 bit VC4 system with a 64 bit ARM CPU added on.
That was all seamless while 1G RAM was the maximum fitted. To work with 4G RAM and a 64 bit CPU, the kernel needs some work.
Currently, 64 bit Pi4 can only use 1G RAM but other than that it appears to all work.

The Raspberry Pi 3 64 bit Install provides the detail with a small addendum for the Pi 4.

-- edit --

The kernel patches to use 4G RAM are out. See PR 3144
Works for me.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.