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Re: Debian abandoning armhf, Raspberry Pi OS - was Re: [PATCH v2] arm64:compat: Implement misalignment fixups formultiword loads

On 7/15/22 11:09, Andrew M.A. Cater wrote:
On Fri, Jul 15, 2022 at 05:39:34AM -0400, gene heskett wrote:
On 7/15/22 04:04, LinAdmin wrote:
Pi 4 has much more throughput in 32-bit modes but the so
called experts of Debian decided to abandon it :-(

On 14.07.22 03:52, Wookey wrote:
On 2022-07-01 15:53 +0200, Ard Biesheuvel wrote:
The 32-bit ARM kernel implements fixups on behalf of user space when
using LDM/STM or LDRD/STRD instructions on addresses that are not 32-bit
This feature is one of the remaining impediments to being able to switch
to 64-bit kernels on 64-bit capable hardware running 32-bit user space,
so let's implement it for the arm64 compat layer as well.
I agree.  So far, raspios is still available in armhf flavor, and for
heavy machinery with just a few microseconds to respond to an IRQ,
armhf builds are a given. LinuxCNC is such an application.


Just a thought: you might want to check which "so called experts" you are
calling out here. Wookey has been an expert at ARM for the last 15 years or
more - he knows what he's talking about.

Debian has *not* abandoned armhf - Debian is one of the last Linux
distributions actively supporting 32 bit for ARM or Intel architectures.


Raspberry Pi OS is **not** Debian. Strictly, it's very much on its own as a forkof Raspbian from Peter Green.
For historical reasons, Raspbian and Raspberry Pi OS are the odd ones out with
their version of armhf - arm v6 plus hardware floating point originally,
where everyone else had settled on arm v7 plus hardware floating point.
Ahh contraire, linuxcnc is at this moment and has been since the
rpi was a 3b, running on the armhf version quite well in fact.  With this kernel: Linux rpi4.coyote.den 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Thu Feb 6 07:09:18 EST 2020 armv7l GNU/Linux
LinuxCNC is probably supported by neither Debian nor Raspberry Pi OS.

Finally, of course, it's useful for everyone to remember to be polite
and considerate - Code of Conduct applies here as everywhere else on
Debian's mailing lists.

With every good wish, as ever,

Andy Cater


Cheers, Gene Heskett.
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>

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