From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Arnd Bergmann <arnd@kernel.org>
Cc: linux-serial@vger.kernel.org,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jiri Slaby" <jirislaby@kernel.org>,
"Hugo Villeneuve" <hvilleneuve@dimonoff.com>,
"Uwe Kleine-König" <u.kleine-koenig@baylibre.com>,
linux-kernel@vger.kernel.org,
"Maciej W . Rozycki" <macro@orcam.me.uk>,
"Kiyokazu SUTO" <suto@ks-and-ks.ne.jp>,
"Arnd Bergmann" <arnd@arndb.de>
Subject: Re: [PATCH 1/2] [v4] serial: 8250: remove obsolete PORT_RSA support
Date: Wed, 21 Oct 2026 12:27:01 +0300 [thread overview]
Message-ID: <atiFZf9dFO3rtsYr@ashevche-desk.local> (raw)
In-Reply-To: <20261021081746.3278002-1-arnd@kernel.org>
On Wed, Oct 21, 2026 at 10:17:45AM +0200, Arnd Bergmann wrote:
> For all I can tell, the RSA support in the 8250 driver is not functional
> and has not been for a long time.
>
> The RSA-DV II/S ISA card[1] was sold by IODATA in the 1990s as a faster
> alternative to regular ISA serial ports, and it was discontinued in
> 2002. Linux support was added by Kiyokazu SUTO in 2000[2]. The company
> also made PCI versions of this device, but Linux never supported those.
>
> It seems that a patch to setserial would be required in order to set
> PORT_RSA when not using autoconfiguration, and this was never merged.
> Autotoconfiguration in turn requires passing probe_rsa=IOPORT arguments
> at boot or module load time, which is not how any other uart drivers
> work any more since linux-2.4.
>
> This patch removes all code related to the RSA support, with the exception
> of the user-visible PORT_RSA definition. I had originall sent this in
> 2011 [3], but did not follow up at the time.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
--
With Best Regards,
Andy Shevchenko
prev parent reply other threads:[~2026-10-21 9:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 8:17 Arnd Bergmann
2026-10-21 8:17 ` [PATCH 2/2] [v4] serial: 8250: remove hub6 multiport support Arnd Bergmann
2026-10-21 9:27 ` Andy Shevchenko [this message]
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