From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265514AbUBPNO6 (ORCPT ); Mon, 16 Feb 2004 08:14:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265526AbUBPNO6 (ORCPT ); Mon, 16 Feb 2004 08:14:58 -0500 Received: from pr-117-210.ains.net.au ([202.147.117.210]:18887 "EHLO mail.ocs.com.au") by vger.kernel.org with ESMTP id S265514AbUBPNOm (ORCPT ); Mon, 16 Feb 2004 08:14:42 -0500 X-Mailer: exmh version 2.5 01/15/2001 with nmh-1.0.4 From: Keith Owens To: linux-kernel@vger.kernel.org Cc: Bjorn Helgaas Subject: 2.6.3-rc3 serial console woes Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 17 Feb 2004 00:14:22 +1100 Message-ID: <3326.1076937262@ocs3.ocs.com.au> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Between 2.6.3-rc2 and 2.6.3-rc3, the serial console initialisation changed, due to this patch :- http://linux.bkbits.net:8080/linux-2.5/cset@1.1653?nav=index.html|ChangeSet@-7d Now the serial console is not initialised until a long way into the boot, just after the disks are probed. This makes it impossible to use a kernel debugger such as kdb or kgdb over a serial console during device initialisation. You get no serial console output until after devices have been probed. So if something goes wrong during boot, you have no indication of the problem. Even without device problems, the delay on serial console output can make it look like the machine has hung, with no output on the serial console until a couple of minutes after boot. .config extract X86=y MMU=y UID16=y GENERIC_ISA_DMA=y EXPERIMENTAL=y CLEAN_COMPILE=y STANDALONE=y SWAP=y SYSVIPC=y SYSCTL=y LOG_BUF_SHIFT=16 KALLSYMS=y FUTEX=y EPOLL=y IOSCHED_NOOP=y IOSCHED_AS=y IOSCHED_DEADLINE=y MODULES=y OBSOLETE_MODPARM=y KMOD=y X86_PC=y M686=y X86_CMPXCHG=y X86_XADD=y X86_L1_CACHE_SHIFT=5 RWSEM_XCHGADD_ALGORITHM=y X86_PPRO_FENCE=y X86_WP_WORKS_OK=y X86_INVLPG=y X86_BSWAP=y X86_POPAD_OK=y X86_GOOD_APIC=y X86_USE_PPRO_CHECKSUM=y SMP=y NR_CPUS=2 X86_LOCAL_APIC=y X86_IO_APIC=y X86_TSC=y X86_MCE=y X86_MSR=m X86_CPUID=m NOHIGHMEM=y MTRR=y HAVE_DEC_LOCK=y ACPI_BOOT=y PCI=y PCI_GOANY=y PCI_BIOS=y PCI_DIRECT=y PCI_NAMES=y ISA=y BINFMT_ELF=y BINFMT_AOUT=m BINFMT_MISC=m PARPORT=m PARPORT_PC=m PARPORT_PC_CML1=m BLK_DEV_FD=y BLK_DEV_LOOP=m BLK_DEV_RAM=y BLK_DEV_RAM_SIZE=4096 IDE=y BLK_DEV_IDE=y BLK_DEV_IDEDISK=y BLK_DEV_IDECD=y BLK_DEV_IDESCSI=y IDE_GENERIC=y BLK_DEV_IDEPCI=y IDEPCI_SHARE_IRQ=y BLK_DEV_IDEDMA_PCI=y IDEDMA_PCI_AUTO=y BLK_DEV_ADMA=y BLK_DEV_HPT366=y BLK_DEV_PIIX=y BLK_DEV_IDEDMA=y IDEDMA_AUTO=y SCSI=y SCSI_PROC_FS=y BLK_DEV_SD=y BLK_DEV_SR=m BLK_DEV_SR_VENDOR=y CHR_DEV_SG=m SCSI_REPORT_LUNS=y SCSI_CONSTANTS=y SCSI_LOGGING=y SCSI_AHA1542=m SCSI_SYM53C8XX_2=y SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=1 SCSI_SYM53C8XX_DEFAULT_TAGS=16 SCSI_SYM53C8XX_MAX_TAGS=64 SCSI_QLA2XXX=y NET=y PACKET=m NETLINK_DEV=m UNIX=y INET=y INET_ECN=y SYN_COOKIES=y NETFILTER=y IP_NF_CONNTRACK=m IP_NF_FTP=m IP_NF_IRC=m IP_NF_QUEUE=m IP_NF_IPTABLES=m IP_NF_MATCH_LIMIT=m IP_NF_MATCH_MAC=m IP_NF_MATCH_PKTTYPE=m IP_NF_MATCH_MARK=m IP_NF_MATCH_MULTIPORT=m IP_NF_MATCH_TOS=m IP_NF_MATCH_ECN=m IP_NF_MATCH_DSCP=m IP_NF_MATCH_AH_ESP=m IP_NF_MATCH_LENGTH=m IP_NF_MATCH_TTL=m IP_NF_MATCH_TCPMSS=m IP_NF_MATCH_HELPER=m IP_NF_MATCH_STATE=m IP_NF_MATCH_CONNTRACK=m IP_NF_MATCH_OWNER=m IP_NF_FILTER=m IP_NF_TARGET_REJECT=m IP_NF_NAT=m IP_NF_NAT_NEEDED=y IP_NF_TARGET_MASQUERADE=m IP_NF_TARGET_REDIRECT=m IP_NF_NAT_LOCAL=y IP_NF_NAT_IRC=m IP_NF_NAT_FTP=m IP_NF_MANGLE=m IP_NF_TARGET_TOS=m IP_NF_TARGET_ECN=m IP_NF_TARGET_DSCP=m IP_NF_TARGET_MARK=m IP_NF_TARGET_LOG=m IP_NF_TARGET_ULOG=m IP_NF_TARGET_TCPMSS=m IP_NF_ARPTABLES=m IP_NF_ARPFILTER=m IP_NF_COMPAT_IPCHAINS=m IP_NF_COMPAT_IPFWADM=m IPV6_SCTP__=y NETDEVICES=y DUMMY=m ETHERTAP=m NET_ETHERNET=y NET_TULIP=y TULIP=m NET_ISA=y NE2000=m NET_PCI=y PLIP=m PPP=m PPP_ASYNC=m PPP_DEFLATE=m PPP_BSDCOMP=m SLIP=m SLIP_COMPRESSED=y INPUT=y INPUT_MOUSEDEV=y INPUT_MOUSEDEV_PSAUX=y INPUT_MOUSEDEV_SCREEN_X=1024 INPUT_MOUSEDEV_SCREEN_Y=768 SOUND_GAMEPORT=y SERIO=y SERIO_I8042=y SERIO_SERPORT=y INPUT_KEYBOARD=y KEYBOARD_ATKBD=y INPUT_MOUSE=y MOUSE_PS2=y VT=y VT_CONSOLE=y HW_CONSOLE=y SERIAL_8250=y SERIAL_8250_CONSOLE=y SERIAL_8250_NR_UARTS=4 SERIAL_CORE=y SERIAL_CORE_CONSOLE=y UNIX98_PTYS=y UNIX98_PTY_COUNT=256 PRINTER=m LP_CONSOLE=y NVRAM=m RTC=y VGA_CONSOLE=y DUMMY_CONSOLE=y SOUND=m EXT2_FS=y XFS_FS=y XFS_QUOTA=y MINIX_FS=m ROMFS_FS=m QUOTACTL=y AUTOFS_FS=m AUTOFS4_FS=m ISO9660_FS=m JOLIET=y ZISOFS=y ZISOFS_FS=m FAT_FS=m MSDOS_FS=m VFAT_FS=m NTFS_FS=m PROC_FS=y PROC_KCORE=y DEVPTS_FS=y TMPFS=y RAMFS=y HPFS_FS=m NFS_FS=m NFS_V3=y NFSD=m NFSD_V3=y LOCKD=m LOCKD_V4=y EXPORTFS=m SUNRPC=m SMB_FS=m MSDOS_PARTITION=y NLS=y NLS_DEFAULT="iso8859-1" DEBUG_KERNEL=y DEBUG_SLAB=y MAGIC_SYSRQ=y KDB=y KDB_MODULES=m KDB_CONTINUE_CATASTROPHIC=0 X86_FIND_SMP_CONFIG=y X86_MPPARSE=y CRC32=m ZLIB_INFLATE=m ZLIB_DEFLATE=m X86_SMP=y X86_HT=y X86_BIOS_REBOOT=y X86_TRAMPOLINE=y PC=y