firm date: armv5 support removal scheduled for 2019-12-31

[Mori Hiroki]

Hi

I have very angry. Because of this.

One is Maverl soc is not right performance on FreeBSD now.

Maverl FreeBSD is 10-30 times slow from Linux.

I think armv5t support is not complete on FreeBSD.

You say armv5t pmap have bug. But my RT1310(armv5t) work well half of year.

I try ldd on armv5t one month ago. That is support for armv4 because of

that don't know armv4t instruction by default.

Hiroki Mori


----- Original Message -----
> From: Warner Losh <imp at bsdimp.com>
> To: "freebsd-arch at freebsd.org" <freebsd-arch at freebsd.org>; "freebsd-arm at freebsd.org" <freebsd-arm at freebsd.org>
> Cc: 
> Date: 2019/10/10, Thu 06:40
> Subject: firm date: armv5 support removal scheduled for 2019-12-31
> 
>G reetings,
> 
> There's been much talk of removing armv5 support from FreeBSD in FreeBSD
> 13. This talk has been ongoing since before 12 was branched among the key
> arm developers. The compromise for the FreeBSD 12 was to have one final
> FreeBSD armv5 release for a few straggling users that needed (or think they
> needed) this release and it would be removed before FreeBSD 13.
> 
> The reason to remove this is due to the increased burden armv5 has
> presented on the system. We have a separate pmap for v5 which has known or
> suspected bugs relating to unaligned I/O. No developers have the armv5
> boards in service anymore. They have ceased being relevant to FreeBSD's
> success with the plethera of armv7 boards that are on the market. No new
> armv5 boards have been made in a long time. The FreeBSD project hasn't
> produce armv5 binaries for 12.x at all (the binaries produced earlier could
> not have possibly booted, though the userland binaries worked if you could
> otherwise install the system). Finally, llvm's lld doesn't support 
> armv5.
> It would ease integration if we didn't have to worry about a fallback for
> armv5. It would be one fewer dependency on the old binutils toolchain in
> the tree.
> 
> So, taking all these things together, the time has come to schedule removal
> of armv5 support from FreeBSD. The end of the year seems like a good date
> to select for planning this removal, getting whatever notices should be put
> into place and warning people about the next release in the most formal way
> possible (more informal warnings have been going on for over a year,
> starting with armv4 support removal in 12).
> 
> I'm posting this now to gather feedback and, if necessary, create a
> checklist of things to do before removal.
> 
> Warner
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