<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/3.14.3"> </HEAD> <BODY> Hi all, I compiled Xorg server from source code. My linux distribution is Debians and CPU is mipsel. I have tried source packages from freedesktop and debians. But xorg crashed when I tried to make it work. I just found it happened while graphic chip driver call outb(), which is defined as below: static __inline__ void outb(unsigned PORT_SIZE port, unsigned char val) { *(volatile unsigned char*)(((unsigned PORT_SIZE)(port))+IOPortBase) = val; }. IOPortBase is defined in the same head file "hw/xfree86/common/compiler.h" I had grepped IOPortBase in the whole source code and I got below: hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = base; hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = base; hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned int)-1; hw/xfree86/os-support/bsd/arm_video.c: * space (e.g. 0x3B0), but IOPortBase is expected to map to hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned int)xf86MapInfoMap(memInfoP, hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned int)base; hw/xfree86/os-support/bsd/arm_video.c: if (IOPortBase == (unsigned int)-1) hw/xfree86/os-support/bsd/arm_video.c: munmap((caddr_t)IOPortBase, 0x400); hw/xfree86/os-support/bsd/arm_video.c: IOPortBase = (unsigned int)-1; hw/xfree86/common/compiler.h:unsigned int IOPortBase; /* Memory mapped I/O port area */ hw/xfree86/common/compiler.h: *(volatile unsigned char*)(((unsigned PORT_SIZE)(port))+IOPortBase) = val; hw/xfree86/common/compiler.h: *(volatile unsigned short*)(((unsigned PORT_SIZE)(port))+IOPortBase) = val; hw/xfree86/common/compiler.h: *(volatile unsigned int*)(((unsigned PORT_SIZE)(port))+IOPortBase) = val; hw/xfree86/common/compiler.h: return *(volatile unsigned char*)(((unsigned PORT_SIZE)(port))+IOPortBase); hw/xfree86/common/compiler.h: return *(volatile unsigned short*)(((unsigned PORT_SIZE)(port))+IOPortBase); hw/xfree86/common/compiler.h: return *(volatile unsigned int*)(((unsigned PORT_SIZE)(port))+IOPortBase); To the file arm_video.c, only the first line worked others are remarked. The first line is in the function: #if defined(USE_ARC_MMAP) || defined(__arm32__) Bool xf86EnableIO() { int fd; pointer base; if (ExtendedEnabled) return TRUE; if ((fd = open("/dev/ttyC0", O_RDWR)) >= 0) { /* Try to map a page at the pccons I/O space */ base = (pointer)mmap((caddr_t)0, 65536, PROT_READ | PROT_WRITE, MAP_FLAGS, fd, (off_t)0x0000); if (base != (pointer)-1) { IOPortBase = base; } else { xf86Msg(X_WARNING,"EnableIO: failed to mmap %s (%s)\n", "/dev/ttyC0", strerror(errno)); return FALSE; } } else { xf86Msg("EnableIO: failed to open %s (%s)\n", "/dev/ttyC0", strerror(errno)); return FALSE; } ExtendedEnabled = TRUE; return TRUE; } Since there is "#if defined(USE_ARC_MMAP) || defined(__arm32__)", I am not sure that this function had been compiled into Xorg. I just test this #include <stdio.h> int main(void) { #if defined(__mips__) printf("mips\n"); #elif defined(__arm32__) printf("arm32\n"); #else printf("hehe\n"); #endif return 0; } and it just show "mips". So I am afraid that the function xf86EnableIO() which assigned value to IOPortBase wouldn't been compiled into Xorg. IOPortBase is 0 if I use my own Xorg. I also tried the default Xorg which works fine. IOPortBase is not 0. I compiled Xorg with "--enable-debug --prefix=/root/belcon". Any one has any ideas? Maybe it is just something related to "./configure". Regards, Belcon Below is gdb output: gdb hw/xfree86/Xorg GNU gdb 6.4.90-debian Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "mipsel-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1". (gdb) run Starting program: /root/belcon/xorg-server-1.1.1/hw/xfree86/Xorg _XSERVTransSocketOpenCOTSServer: Unable to open socket for inet6 _XSERVTransOpen: transport open failed for inet6/debian:0 _XSERVTransMakeAllCOTSServerListeners: failed to open listener for inet6 X Window System Version 7.1.1 Release Date: 12 May 2006 X Protocol Version 11, Revision 0, Release 7.1.1 Build Operating System: Linux 2.6.18.1 mips64 Current Operating System: Linux debian 2.6.18.1 #3 Mon Sep 3 12:52:27 CST 2007 mips64 Build Date: 21 March 2008 Before reporting problems, check <A HREF="http://wiki.x.org">http://wiki.x.org</A> to make sure that you have the latest version. Module Loader present Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/root/belcon//var/log/Xorg.0.log", Time: Mon Mar 24 14:18:39 2008 (==) Using config file: "/etc/X11/xorg.conf" [tcsetpgrp failed in terminal_inferior: 不允许的操作] (EE) Silicon MotionlcdWidth = 1280 LCD Base = 0 FBOffset is 0x0 Program received signal SIGSEGV, Segmentation fault. SMI_SaveScreen (pScreen=<value optimized out>, mode=<value optimized out>) at /usr/include/xorg/compiler.h:916 916 *(volatile unsigned char*)(((unsigned PORT_SIZE)(port))+IOPortBase) = val; (gdb) print IOPortBase $1 = 0 (gdb) bt f #0 SMI_SaveScreen (pScreen=<value optimized out>, mode=<value optimized out>) at /usr/include/xorg/compiler.h:916 seq1 = <value optimized out> pScrn = <value optimized out> on = 1 pSmi = (SMIPtr) 0x64a280 #1 0x0042ef10 in SaveScreens (on=2, mode=0) at window.c:3386 i = 0 what = 1 type = 1 #2 0x00423d00 in main (argc=1, argv=0x7f80bab4, envp=<value optimized out>) at main.c:434 pScreen = <value optimized out> i = 1 error = 6412720 xauthfile = <value optimized out> alwaysCheckForInput = {0, 1} </BODY> </HTML>