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Date:   Mon, 11 Jan 2021 21:05:59 -0500
From:   tedheadster <>
To:     Linux Kernel Mailing List <>
Cc:     Shuah Khan <>,
        Krzysztof Adamski <>,
        Oleksij Rempel <>,
        Baruch Siach <>,
        Russell King - ARM Linux <>,
        Daniel Tang <>,
        Uwe Kleine-K├Ânig 
        <>, Jamie Iles <>,
        Barry Song <>,
        Viresh Kumar <>,
        Linus Walleij <>,
        Jonas Jensen <>,
        Marc Gonzalez <>,
        Hartley Sweeten <>,
        Lubomir Rintel <>,
        Neil Armstrong <>,
        Shawn Guo <>, Alex Elder <>,
        Alexander Shiyan <>,
        Koen Vandeputte <>,
        Hans Ulli Kroll <>,
        Vladimir Zapolskiy <>,
        Wei Xu <>,
        Steven Rostedt <>,
        Yoshinori Sato <>,
        Mark Salter <>,
        Michael Ellerman <>,
        Geert Uytterhoeven <>,
        Thomas Bogendoerfer <>
Subject: Re: Old platforms: bring out your dead


> * 80486SX/DX: 80386 CPUs were dropped in 2012, and there are
>   indications that 486 have no users either on recent kernels.
>   There is still the Vortex86 family of SoCs, and the oldest of those were
>   486SX-class, but all the modern ones are 586-class.

I actively use the i486DX systems for regression testing and they have
proven useful for detecting bugs in both the kernel and GCC (see

I am also about to use them as testing systems for kernel programming
students. I would hate to lose this platform as a student learning

Here are just some of the patches that I have worked on myself:

Kernel patches i486 testing uncovered:

x86/boot: Fix another __read_cr4() case on 486

x86/CPU: Change query logic so CPUID is enabled before testing

GCC patches i486 contributed to:

ibgcc calls __get_cpuid with 0 level breaks on early 486;a=commit;h=a6c78ea30381cc28ea0b2cf8f0bd584a91dda948

ICE in gen_lowpart_general, at rtlhooks.c:63;a=commit;h=980c8afc0961da4b4567a5abe85b6048d501a1ad

So, these systems are _quietly_ being used, and helping to contribute,
it's just not glamorous, eye-catching work.

- Matthew Whitehead

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