Re: [PATCH] [v3] serial: 8250: remove obsolete and broken PORT_RSA support

[Arnd Bergmann]

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