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Wed, 21 Oct 2026 04:00:55 -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: Wed, 21 Oct 2026 10:00:34 +0200 From: "Arnd Bergmann" To: "Maciej W. Rozycki" , "Arnd Bergmann" Cc: "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: <215c694e-bb97-4c21-ae5b-308c03e21611@app.fastmail.com> In-Reply-To: References: <20261019090017.430425-1-arnd@kernel.org> Subject: Re: [PATCH] [v3] serial: 8250: remove obsolete and broken PORT_RSA support Content-Type: text/plain Content-Transfer-Encoding: 7bit On Wed, Oct 21, 2026, at 06:07, Maciej W. Rozycki wrote: > On Wed, 21 Oct 2026, Maciej W. Rozycki wrote: > >> so the only peculiarity is that the 8-byte region requested is actually >> below `port->iobase', presumably relative to standard ISA serial port port >> I/O locations of 0x3f8, 0x2f8, 0x3e8, 0x2e8, possibly not to clash with >> conventional ISA serial port devices where also present in a system (for > > 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. I've updated the changelog text accordingly for v4. Arnd