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Thu, 22 Oct 2026 09:54:54 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface 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 X-ThreadId: AsT4sEkvhRpB Date: Thu, 22 Oct 2026 15:54:34 +0200 From: "Arnd Bergmann" To: "Maciej W. Rozycki" Cc: "Arnd Bergmann" , "Greg Kroah-Hartman" , "Jiri Slaby" , "Andy Shevchenko" , "Hugo Villeneuve" , =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Message-Id: <0cd9560c-6de5-4744-90a4-ecb613594133@app.fastmail.com> In-Reply-To: References: <20261019090017.430425-1-arnd@kernel.org> <215c694e-bb97-4c21-ae5b-308c03e21611@app.fastmail.com> Subject: Re: [PATCH] [v3] serial: 8250: remove obsolete and broken PORT_RSA support Content-Type: text/plain Content-Transfer-Encoding: 7bit On Thu, Oct 22, 2026, at 05:34, Maciej W. Rozycki wrote: > On Wed, 21 Oct 2026, Arnd Bergmann wrote: > >> > Or, to self-correct after a few more mind cycles spent on this piece, the >> > region below `port->iobase' is an expansion of one above, where standard >> > 8250 registers of the onboard serial port reside. Which makes even more >> > sense, to me anyway. >> >> Good catch, so it should still work the same way it was originally >> designed, though I think it still requires a modified setserial to >> set PORT_RSA, or a boot time argument for autoconfiguration with >> UART_CONFIG_TYPE. > > Well, this is ISA, what do you expect? We've dropped lots of stuff that > required perhaps even more complex manual configuration already (QIC-02 > tapes, anyone?). I pointed it out because this is the only UART driver that relies on that specific mechanism. Everything else uses either hardcoded port numbers that like the 3f8/2f8/3e8/2e8 ports for PC compatibility or they rely on PnP. I understand that we have other network/scsi/sound/iio drivers that also do this. Arnd