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Rozycki" , Kiyokazu SUTO , Arnd Bergmann Subject: Re: [PATCH 1/2] [v4] serial: 8250: remove obsolete PORT_RSA support Message-ID: References: <20261021081746.3278002-1-arnd@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261021081746.3278002-1-arnd@kernel.org> Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo 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 -- With Best Regards, Andy Shevchenko