Hello, Onboard PC-compatible serial ports of the 8250 family are expected to be assigned to lines 0 - 3. Unfortunately for MIPS this is not guaranteed as EXTRA_SERIAL_PORT_DEFNS and HUB6_SERIAL_PORT_DFNS precede STD_SERIAL_PORT_DEFNS on the port list and their definitions change depending on CONFIG_SERIAL_MANY_PORTS and CONFIG_HUB6 which are user settable. As a result, they may get different assignments depending on configuration -- e.g. my last build for the Malta board resulted in its onboard ports being assigned to lines 28 and 29. This can be fixed with a correct ordering of entries on the port list, like the following. OK to apply? Maciej patch-mips-2.4.26-20040531-mips-serial-0 diff -up --recursive --new-file linux-mips-2.4.26-20040531.macro/include/asm-mips/serial.h linux-mips-2.4.26-20040531/include/asm-mips/serial.h --- linux-mips-2.4.26-20040531.macro/include/asm-mips/serial.h 2004-06-13 23:16:56.000000000 +0000 +++ linux-mips-2.4.26-20040531/include/asm-mips/serial.h 2004-06-27 12:49:23.000000000 +0000 @@ -5,6 +5,7 @@ * * Copyright (C) 1999 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Copyright (C) 2004 Maciej W. Rozycki */ #ifndef _ASM_SERIAL_H #define _ASM_SERIAL_H @@ -410,14 +411,25 @@ #define DDB5477_SERIAL_PORT_DEFNS #endif +/* + * The order matters here and should be as follows: + * + * 1. STD_SERIAL_PORT_DEFNS + * 2. board-specific ports (please keep sorted) + * 3. EXTRA_SERIAL_PORT_DEFNS + * 4. HUB6_SERIAL_PORT_DFNS + * + * otherwise serial line numbers may change across + * kernel builds if configuration changes. --macro + */ #define SERIAL_PORT_DFNS \ + STD_SERIAL_PORT_DEFNS \ + \ ATLAS_SERIAL_PORT_DEFNS \ AU1000_SERIAL_PORT_DEFNS \ COBALT_SERIAL_PORT_DEFNS \ DDB5477_SERIAL_PORT_DEFNS \ EV96100_SERIAL_PORT_DEFNS \ - EXTRA_SERIAL_PORT_DEFNS \ - HUB6_SERIAL_PORT_DFNS \ ITE_SERIAL_PORT_DEFNS \ IVR_SERIAL_PORT_DEFNS \ JAZZ_SERIAL_PORT_DEFNS \ @@ -426,8 +438,10 @@ MOMENCO_OCELOT_C_SERIAL_PORT_DEFNS \ MOMENCO_JAGUAR_ATX_SERIAL_PORT_DEFNS \ SEAD_SERIAL_PORT_DEFNS \ - STD_SERIAL_PORT_DEFNS \ TITAN_SERIAL_PORT_DEFNS \ - TXX927_SERIAL_PORT_DEFNS + TXX927_SERIAL_PORT_DEFNS \ + \ + EXTRA_SERIAL_PORT_DEFNS \ + HUB6_SERIAL_PORT_DFNS #endif /* _ASM_SERIAL_H */ diff -up --recursive --new-file linux-mips-2.4.26-20040531.macro/include/asm-mips64/serial.h linux-mips-2.4.26-20040531/include/asm-mips64/serial.h --- linux-mips-2.4.26-20040531.macro/include/asm-mips64/serial.h 2003-12-18 03:57:25.000000000 +0000 +++ linux-mips-2.4.26-20040531/include/asm-mips64/serial.h 2004-06-27 12:52:51.000000000 +0000 @@ -5,6 +5,7 @@ * * Copyright (C) 1999 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Copyright (C) 2004 Maciej W. Rozycki */ #ifndef _ASM_SERIAL_H #define _ASM_SERIAL_H @@ -146,12 +147,22 @@ #define IP27_SERIAL_PORT_DEFNS #endif /* CONFIG_SGI_IP27 */ +/* + * The order matters here and should be as follows: + * + * 1. STD_SERIAL_PORT_DEFNS + * 2. board-specific ports (please keep sorted) + * + * otherwise serial line numbers may change across + * kernel builds if configuration changes. --macro + */ #define SERIAL_PORT_DFNS \ + STD_SERIAL_PORT_DEFNS \ + \ IP27_SERIAL_PORT_DEFNS \ MOMENCO_OCELOT_C_SERIAL_PORT_DEFNS \ MOMENCO_JAGUAR_ATX_SERIAL_PORT_DEFNS \ SEAD_SERIAL_PORT_DEFNS \ - STD_SERIAL_PORT_DEFNS \ TITAN_SERIAL_PORT_DEFNS #define RS_TABLE_SIZE 64
