linux-kernel - RE: [RFC 0/6] pcmcia: separate 16-bit support from cardbus

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Date:   Tue, 28 Feb 2023 22:45:00 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Russell King' <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...nel.org>
CC:     Dominik Brodowski <linux@...inikbrodowski.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        "Ian Abbott" <abbotti@....co.uk>, Jakub Kicinski <kuba@...nel.org>,
        Kevin Cernekee <cernekee@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        Manuel Lauss <manuel.lauss@...il.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "Olof Johansson" <olof@...om.net>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        "YOKOTA Hiroshi" <yokota@...lab.is.tsukuba.ac.jp>,
        "bcm-kernel-feedback-list@...adcom.com" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [RFC 0/6] pcmcia: separate 16-bit support from cardbus

From: Russell King
> Sent: 27 February 2023 20:16
> 
> On Mon, Feb 27, 2023 at 02:34:51PM +0100, Arnd Bergmann wrote:
> > I don't expect this to be a problem normal laptop support, as the last
> > PC models that predate Cardbus support (e.g. 1997 ThinkPad 380ED) are
> > all limited to i586MMX CPUs and 80MB of RAM. This is barely enough to
> > boot Tiny Core Linux but not a regular distro.
> 
> Am I understanding that the argument you're putting forward here is
> "cardbus started in year X, so from year X we can ignore 16-bit
> PCMCIA support" ?
> 
> Given that PCMCIA support has been present in x86 hardware at least
> up to 2010, I don't see how that is any basis for making a decision
> about 16-bit PCMCIA support.
> 
> Isn't the relevant factor here whether 16-bit PCMCIA cards are still
> in use on hardware that can run a modern distro? (And yes, x86
> machines that have 16-bit PCMCIA can still run Debian Stable today.)

Or, more specifically, are any people using 16-bit PCMCIA cards
in cardbus-capable sockets with a current kernel.
They might be using unusual cards that aren't available as
cardbus - perhaps 56k modems (does anyone still use those?).

I'm pretty sure I've used sparc systems that had slots that
would take both pcmcia and cardbus cards.
Would have been 20 years ago - but they were 64MHz PCI so wouldn't
have been that slow (I can't remember which cpu it was).
They ran Solaris, but weren't made by Sun.

	David

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