[uml-devel] 2.6 UML Kernel Woes (re UDB Device)

[uml-devel] 2.6 UML Kernel Woes (re UDB Device)

[William R. Lorenz]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 1645 bytes --]

Greetings,

I've grabed the 2.6.3 kernel source an applied uml-patch-2.6.3-rc2-1.bz2
as made available on the UML site @ SourceForge.  I've then configured the
kernel with a `make ARCH=um menuconfig`, compiled it with a `make ARCH=um
linux`, and tried to run it on a 2.4.23 skas3+fairsched patched host.  I
also added in an MPPE patch for PPTP-related stuff, which should be fine.

When I run the 2.6.3 binary, I get the following error to the console:

  VFS: Cannot open root device "ubd0" or unknown-block(0,0)
  Please append a correct "root=" boot option
  Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)

I'm calling the UML binary with the following command-line options:

  user$ ./linux-2.6.3.mppe.bin devfs=nomount mem=128M \
    ubd0=fedora-core1.disk \
    con0=fd:0,fd:1 con=/dev/null \
    eth0=tuntap,tap3 root=/dev/ubd0

It's not a permissions problem with the 'fedora-core1.disk' file, as this
file works just fine with a 2.4.x UML kernel, and it's an ext3 filesystem:

  [root@phobos linux-2.6.3]# grep EXT3 .config
  CONFIG_EXT3_FS=y
  CONFIG_EXT3_FS_XATTR=y
  CONFIG_EXT3_FS_POSIX_ACL=y
  # CONFIG_EXT3_FS_SECURITY is not set
  [root@phobos linux-2.6.3]# grep EXT2 .config
  CONFIG_EXT2_FS=y
  # CONFIG_EXT2_FS_XATTR is not set
  [root@phobos linux-2.6.3]# 

I've attached the complete kernel .config I used for this 2.6 compilation.

Any help would be very much appreciated.  Thanks, in advance.

--          _ 
__ __ ___ _| | William R. Lorenz <wrl@express.org> 
\ V  V / '_| | http://www.clevelandlug.net/ ; "Every revolution was 
 \./\./|_| |_| first a thought in one man's mind." - Ralph Waldo Emerson 

[-- Attachment #2: Type: TEXT/PLAIN, Size: 12477 bytes --]

#
# Automatically generated make config: don't edit
#
CONFIG_USERMODE=y
CONFIG_MMU=y
CONFIG_UID16=y
CONFIG_RWSEM_GENERIC_SPINLOCK=y

#
# UML-specific options
#
CONFIG_MODE_TT=y
CONFIG_MODE_SKAS=y
CONFIG_NET=y
CONFIG_BINFMT_ELF=y
CONFIG_BINFMT_MISC=m
# CONFIG_HOSTFS is not set
# CONFIG_HPPFS is not set
# CONFIG_MCONSOLE is not set
# CONFIG_HOST_2G_2G is not set
# CONFIG_UML_SMP is not set
# CONFIG_SMP is not set
CONFIG_NEST_LEVEL=0
CONFIG_KERNEL_HALF_GIGS=1
# CONFIG_HIGHMEM is not set
# CONFIG_PROC_MM is not set
CONFIG_KERNEL_STACK_ORDER=2
CONFIG_UML_REAL_TIME_CLOCK=y

#
# Code maturity level options
#
CONFIG_EXPERIMENTAL=y
CONFIG_CLEAN_COMPILE=y
CONFIG_STANDALONE=y
CONFIG_BROKEN_ON_SMP=y

#
# General setup
#
CONFIG_SWAP=y
CONFIG_SYSVIPC=y
CONFIG_BSD_PROCESS_ACCT=y
CONFIG_SYSCTL=y
CONFIG_LOG_BUF_SHIFT=14
CONFIG_IKCONFIG=y
# CONFIG_IKCONFIG_PROC is not set
# CONFIG_EMBEDDED is not set
CONFIG_KALLSYMS=y
CONFIG_FUTEX=y
CONFIG_EPOLL=y
CONFIG_IOSCHED_NOOP=y
CONFIG_IOSCHED_AS=y
CONFIG_IOSCHED_DEADLINE=y
# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set

#
# Loadable module support
#
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODULE_FORCE_UNLOAD=y
CONFIG_OBSOLETE_MODPARM=y
CONFIG_MODVERSIONS=y
CONFIG_KMOD=y

#
# Generic Driver Options
#

#
# Character Devices
#
CONFIG_STDIO_CONSOLE=y
CONFIG_SSL=y
CONFIG_FD_CHAN=y
CONFIG_NULL_CHAN=y
CONFIG_PORT_CHAN=y
CONFIG_PTY_CHAN=y
CONFIG_TTY_CHAN=y
CONFIG_XTERM_CHAN=y
CONFIG_CON_ZERO_CHAN="fd:0,fd:1"
CONFIG_CON_CHAN="xterm"
CONFIG_SSL_CHAN="pty"
CONFIG_UNIX98_PTYS=y
CONFIG_UNIX98_PTY_COUNT=512
CONFIG_WATCHDOG=y
# CONFIG_WATCHDOG_NOWAYOUT is not set
CONFIG_SOFT_WATCHDOG=m
# CONFIG_UML_WATCHDOG is not set
# CONFIG_UML_SOUND is not set
# CONFIG_SOUND is not set
# CONFIG_HOSTAUDIO is not set

#
# Block Devices
#
CONFIG_BLK_DEV_UBD=y
CONFIG_BLK_DEV_UBD_SYNC=y
CONFIG_BLK_DEV_COW_COMMON=y
CONFIG_BLK_DEV_LOOP=m
CONFIG_BLK_DEV_NBD=m
CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_SIZE=4096
CONFIG_BLK_DEV_INITRD=y
# CONFIG_MMAPPER is not set
CONFIG_NETDEVICES=y

#
# UML Network Devices
#
CONFIG_UML_NET=y
CONFIG_UML_NET_ETHERTAP=y
CONFIG_UML_NET_TUNTAP=y
CONFIG_UML_NET_SLIP=y
CONFIG_UML_NET_DAEMON=y
CONFIG_UML_NET_MCAST=y
CONFIG_UML_NET_PCAP=y
CONFIG_UML_NET_SLIRP=y

#
# Networking support
#

#
# Networking options
#
CONFIG_PACKET=y
CONFIG_PACKET_MMAP=y
CONFIG_NETLINK_DEV=y
CONFIG_UNIX=y
CONFIG_NET_KEY=m
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_IP_ROUTE_FWMARK=y
CONFIG_IP_ROUTE_NAT=y
CONFIG_IP_ROUTE_MULTIPATH=y
CONFIG_IP_ROUTE_TOS=y
CONFIG_IP_ROUTE_VERBOSE=y
# CONFIG_IP_PNP is not set
CONFIG_NET_IPIP=m
CONFIG_NET_IPGRE=m
CONFIG_NET_IPGRE_BROADCAST=y
CONFIG_IP_MROUTE=y
CONFIG_IP_PIMSM_V1=y
CONFIG_IP_PIMSM_V2=y
# CONFIG_ARPD is not set
# CONFIG_INET_ECN is not set
CONFIG_SYN_COOKIES=y
CONFIG_INET_AH=m
CONFIG_INET_ESP=m
CONFIG_INET_IPCOMP=m

#
# IP: Virtual Server Configuration
#
CONFIG_IP_VS=m
CONFIG_IP_VS_DEBUG=y
CONFIG_IP_VS_TAB_BITS=16

#
# IPVS transport protocol load balancing support
#
CONFIG_IP_VS_PROTO_TCP=y
CONFIG_IP_VS_PROTO_UDP=y
CONFIG_IP_VS_PROTO_ESP=y
CONFIG_IP_VS_PROTO_AH=y

#
# IPVS scheduler
#
CONFIG_IP_VS_RR=m
CONFIG_IP_VS_WRR=m
CONFIG_IP_VS_LC=m
CONFIG_IP_VS_WLC=m
CONFIG_IP_VS_LBLC=m
CONFIG_IP_VS_LBLCR=m
CONFIG_IP_VS_DH=m
CONFIG_IP_VS_SH=m
CONFIG_IP_VS_SED=m
CONFIG_IP_VS_NQ=m

#
# IPVS application helper
#
CONFIG_IP_VS_FTP=m
CONFIG_IPV6=m
CONFIG_IPV6_PRIVACY=y
CONFIG_INET6_AH=m
CONFIG_INET6_ESP=m
CONFIG_INET6_IPCOMP=m
CONFIG_IPV6_TUNNEL=m
# CONFIG_DECNET is not set
CONFIG_BRIDGE=m
CONFIG_NETFILTER=y
CONFIG_NETFILTER_DEBUG=y
CONFIG_BRIDGE_NETFILTER=y

#
# IP: Netfilter Configuration
#
CONFIG_IP_NF_CONNTRACK=m
CONFIG_IP_NF_FTP=m
CONFIG_IP_NF_IRC=m
CONFIG_IP_NF_TFTP=m
CONFIG_IP_NF_AMANDA=m
CONFIG_IP_NF_QUEUE=m
CONFIG_IP_NF_IPTABLES=m
CONFIG_IP_NF_MATCH_LIMIT=m
CONFIG_IP_NF_MATCH_IPRANGE=m
CONFIG_IP_NF_MATCH_MAC=m
CONFIG_IP_NF_MATCH_PKTTYPE=m
CONFIG_IP_NF_MATCH_MARK=m
CONFIG_IP_NF_MATCH_MULTIPORT=m
CONFIG_IP_NF_MATCH_TOS=m
CONFIG_IP_NF_MATCH_RECENT=m
CONFIG_IP_NF_MATCH_ECN=m
CONFIG_IP_NF_MATCH_DSCP=m
CONFIG_IP_NF_MATCH_AH_ESP=m
CONFIG_IP_NF_MATCH_LENGTH=m
CONFIG_IP_NF_MATCH_TTL=m
CONFIG_IP_NF_MATCH_TCPMSS=m
CONFIG_IP_NF_MATCH_HELPER=m
CONFIG_IP_NF_MATCH_STATE=m
CONFIG_IP_NF_MATCH_CONNTRACK=m
CONFIG_IP_NF_MATCH_OWNER=m
CONFIG_IP_NF_MATCH_PHYSDEV=m
CONFIG_IP_NF_FILTER=m
CONFIG_IP_NF_TARGET_REJECT=m
CONFIG_IP_NF_NAT=m
CONFIG_IP_NF_NAT_NEEDED=y
CONFIG_IP_NF_TARGET_MASQUERADE=m
CONFIG_IP_NF_TARGET_REDIRECT=m
CONFIG_IP_NF_TARGET_NETMAP=m
CONFIG_IP_NF_TARGET_SAME=m
CONFIG_IP_NF_NAT_LOCAL=y
CONFIG_IP_NF_NAT_SNMP_BASIC=m
CONFIG_IP_NF_NAT_IRC=m
CONFIG_IP_NF_NAT_FTP=m
CONFIG_IP_NF_NAT_TFTP=m
CONFIG_IP_NF_NAT_AMANDA=m
CONFIG_IP_NF_MANGLE=m
CONFIG_IP_NF_TARGET_TOS=m
CONFIG_IP_NF_TARGET_ECN=m
CONFIG_IP_NF_TARGET_DSCP=m
CONFIG_IP_NF_TARGET_MARK=m
CONFIG_IP_NF_TARGET_CLASSIFY=m
CONFIG_IP_NF_TARGET_LOG=m
CONFIG_IP_NF_TARGET_ULOG=m
CONFIG_IP_NF_TARGET_TCPMSS=m
CONFIG_IP_NF_ARPTABLES=m
CONFIG_IP_NF_ARPFILTER=m
CONFIG_IP_NF_ARP_MANGLE=m
# CONFIG_IP_NF_COMPAT_IPCHAINS is not set
# CONFIG_IP_NF_COMPAT_IPFWADM is not set

#
# IPv6: Netfilter Configuration
#
CONFIG_IP6_NF_QUEUE=m
CONFIG_IP6_NF_IPTABLES=m
CONFIG_IP6_NF_MATCH_LIMIT=m
CONFIG_IP6_NF_MATCH_MAC=m
CONFIG_IP6_NF_MATCH_RT=m
CONFIG_IP6_NF_MATCH_OPTS=m
CONFIG_IP6_NF_MATCH_FRAG=m
CONFIG_IP6_NF_MATCH_HL=m
CONFIG_IP6_NF_MATCH_MULTIPORT=m
CONFIG_IP6_NF_MATCH_OWNER=m
CONFIG_IP6_NF_MATCH_MARK=m
CONFIG_IP6_NF_MATCH_IPV6HEADER=m
CONFIG_IP6_NF_MATCH_AHESP=m
CONFIG_IP6_NF_MATCH_LENGTH=m
CONFIG_IP6_NF_MATCH_EUI64=m
CONFIG_IP6_NF_FILTER=m
CONFIG_IP6_NF_TARGET_LOG=m
CONFIG_IP6_NF_MANGLE=m
CONFIG_IP6_NF_TARGET_MARK=m

#
# Bridge: Netfilter Configuration
#
CONFIG_BRIDGE_NF_EBTABLES=m
CONFIG_BRIDGE_EBT_BROUTE=m
CONFIG_BRIDGE_EBT_T_FILTER=m
CONFIG_BRIDGE_EBT_T_NAT=m
CONFIG_BRIDGE_EBT_802_3=m
CONFIG_BRIDGE_EBT_AMONG=m
CONFIG_BRIDGE_EBT_ARP=m
CONFIG_BRIDGE_EBT_IP=m
CONFIG_BRIDGE_EBT_LIMIT=m
CONFIG_BRIDGE_EBT_MARK=m
CONFIG_BRIDGE_EBT_PKTTYPE=m
CONFIG_BRIDGE_EBT_STP=m
CONFIG_BRIDGE_EBT_VLAN=m
CONFIG_BRIDGE_EBT_ARPREPLY=m
CONFIG_BRIDGE_EBT_DNAT=m
CONFIG_BRIDGE_EBT_MARK_T=m
CONFIG_BRIDGE_EBT_REDIRECT=m
CONFIG_BRIDGE_EBT_SNAT=m
CONFIG_BRIDGE_EBT_LOG=m
CONFIG_XFRM=y
CONFIG_XFRM_USER=m

#
# SCTP Configuration (EXPERIMENTAL)
#
CONFIG_IPV6_SCTP__=m
# CONFIG_IP_SCTP is not set
# CONFIG_ATM is not set
CONFIG_VLAN_8021Q=m
# CONFIG_LLC2 is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_NET_DIVERT is not set
# CONFIG_ECONET is not set
# CONFIG_WAN_ROUTER is not set
# CONFIG_NET_FASTROUTE is not set
# CONFIG_NET_HW_FLOWCONTROL is not set

#
# QoS and/or fair queueing
#
CONFIG_NET_SCHED=y
CONFIG_NET_SCH_CBQ=m
CONFIG_NET_SCH_HTB=m
CONFIG_NET_SCH_HFSC=m
CONFIG_NET_SCH_CSZ=m
CONFIG_NET_SCH_PRIO=m
CONFIG_NET_SCH_RED=m
CONFIG_NET_SCH_SFQ=m
CONFIG_NET_SCH_TEQL=m
CONFIG_NET_SCH_TBF=m
CONFIG_NET_SCH_GRED=m
CONFIG_NET_SCH_DSMARK=m
CONFIG_NET_SCH_INGRESS=m
CONFIG_NET_QOS=y
CONFIG_NET_ESTIMATOR=y
CONFIG_NET_CLS=y
CONFIG_NET_CLS_TCINDEX=m
CONFIG_NET_CLS_ROUTE4=m
CONFIG_NET_CLS_ROUTE=y
CONFIG_NET_CLS_FW=m
CONFIG_NET_CLS_U32=m
CONFIG_NET_CLS_RSVP=m
CONFIG_NET_CLS_RSVP6=m
CONFIG_NET_CLS_POLICE=y

#
# Network testing
#
# CONFIG_NET_PKTGEN is not set
CONFIG_DUMMY=m
CONFIG_BONDING=m
CONFIG_EQUALIZER=m
CONFIG_TUN=m
CONFIG_ETHERTAP=m

#
# Ethernet (10 or 100Mbit)
#
CONFIG_NET_ETHERNET=y
# CONFIG_MII is not set

#
# Ethernet (1000 Mbit)
#

#
# Ethernet (10000 Mbit)
#
CONFIG_PPP=m
CONFIG_PPP_MULTILINK=y
CONFIG_PPP_FILTER=y
CONFIG_PPP_ASYNC=m
CONFIG_PPP_SYNC_TTY=m
CONFIG_PPP_DEFLATE=m
CONFIG_PPP_BSDCOMP=m
CONFIG_PPP_MPPE=m
CONFIG_PPPOE=m
CONFIG_SLIP=m
CONFIG_SLIP_COMPRESSED=y
CONFIG_SLIP_SMART=y
CONFIG_SLIP_MODE_SLIP6=y

#
# Wireless LAN (non-hamradio)
#
# CONFIG_NET_RADIO is not set

#
# Token Ring devices
#
CONFIG_SHAPER=m

#
# Wan interfaces
#
# CONFIG_WAN is not set

#
# Amateur Radio support
#
# CONFIG_HAMRADIO is not set

#
# IrDA (infrared) support
#
# CONFIG_IRDA is not set

#
# Bluetooth support
#
# CONFIG_BT is not set

#
# File systems
#
CONFIG_EXT2_FS=y
# CONFIG_EXT2_FS_XATTR is not set
CONFIG_EXT3_FS=y
CONFIG_EXT3_FS_XATTR=y
CONFIG_EXT3_FS_POSIX_ACL=y
# CONFIG_EXT3_FS_SECURITY is not set
CONFIG_JBD=y
# CONFIG_JBD_DEBUG is not set
CONFIG_FS_MBCACHE=y
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
CONFIG_FS_POSIX_ACL=y
# CONFIG_XFS_FS is not set
# CONFIG_MINIX_FS is not set
CONFIG_ROMFS_FS=m
CONFIG_QUOTA=y
# CONFIG_QFMT_V1 is not set
CONFIG_QFMT_V2=y
CONFIG_QUOTACTL=y
CONFIG_AUTOFS_FS=m
CONFIG_AUTOFS4_FS=m

#
# CD-ROM/DVD Filesystems
#
CONFIG_ISO9660_FS=m
CONFIG_JOLIET=y
CONFIG_ZISOFS=y
CONFIG_ZISOFS_FS=m
CONFIG_UDF_FS=m

#
# DOS/FAT/NT Filesystems
#
CONFIG_FAT_FS=m
CONFIG_MSDOS_FS=m
CONFIG_VFAT_FS=m
# CONFIG_NTFS_FS is not set

#
# Pseudo filesystems
#
CONFIG_PROC_FS=y
CONFIG_PROC_KCORE=y
# CONFIG_DEVFS_FS is not set
CONFIG_DEVPTS_FS=y
# CONFIG_DEVPTS_FS_XATTR is not set
CONFIG_TMPFS=y
# CONFIG_HUGETLB_PAGE is not set
CONFIG_RAMFS=y

#
# Miscellaneous filesystems
#
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_CRAMFS is not set
# CONFIG_VXFS_FS is not set
# CONFIG_HPFS_FS is not set
# CONFIG_QNX4FS_FS is not set
# CONFIG_SYSV_FS is not set
# CONFIG_UFS_FS is not set

#
# Network File Systems
#
CONFIG_NFS_FS=m
CONFIG_NFS_V3=y
CONFIG_NFS_V4=y
CONFIG_NFS_DIRECTIO=y
CONFIG_NFSD=m
CONFIG_NFSD_V3=y
CONFIG_NFSD_V4=y
CONFIG_NFSD_TCP=y
CONFIG_LOCKD=m
CONFIG_LOCKD_V4=y
CONFIG_EXPORTFS=m
CONFIG_SUNRPC=m
CONFIG_SUNRPC_GSS=m
CONFIG_RPCSEC_GSS_KRB5=m
CONFIG_SMB_FS=m
CONFIG_SMB_NLS_DEFAULT=y
CONFIG_SMB_NLS_REMOTE="cp437"
CONFIG_CIFS=m
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_INTERMEZZO_FS is not set
# CONFIG_AFS_FS is not set

#
# Partition Types
#
# CONFIG_PARTITION_ADVANCED is not set
CONFIG_MSDOS_PARTITION=y

#
# Native Language Support
#
CONFIG_NLS=y
CONFIG_NLS_DEFAULT="iso8859-1"
CONFIG_NLS_CODEPAGE_437=m
CONFIG_NLS_CODEPAGE_737=m
CONFIG_NLS_CODEPAGE_775=m
CONFIG_NLS_CODEPAGE_850=m
CONFIG_NLS_CODEPAGE_852=m
CONFIG_NLS_CODEPAGE_855=m
CONFIG_NLS_CODEPAGE_857=m
CONFIG_NLS_CODEPAGE_860=m
CONFIG_NLS_CODEPAGE_861=m
CONFIG_NLS_CODEPAGE_862=m
CONFIG_NLS_CODEPAGE_863=m
CONFIG_NLS_CODEPAGE_864=m
CONFIG_NLS_CODEPAGE_865=m
CONFIG_NLS_CODEPAGE_866=m
CONFIG_NLS_CODEPAGE_869=m
CONFIG_NLS_CODEPAGE_936=m
CONFIG_NLS_CODEPAGE_950=m
CONFIG_NLS_CODEPAGE_932=m
CONFIG_NLS_CODEPAGE_949=m
CONFIG_NLS_CODEPAGE_874=m
CONFIG_NLS_ISO8859_8=m
CONFIG_NLS_CODEPAGE_1250=m
CONFIG_NLS_CODEPAGE_1251=m
CONFIG_NLS_ISO8859_1=m
CONFIG_NLS_ISO8859_2=m
CONFIG_NLS_ISO8859_3=m
CONFIG_NLS_ISO8859_4=m
CONFIG_NLS_ISO8859_5=m
CONFIG_NLS_ISO8859_6=m
CONFIG_NLS_ISO8859_7=m
CONFIG_NLS_ISO8859_9=m
CONFIG_NLS_ISO8859_13=m
CONFIG_NLS_ISO8859_14=m
CONFIG_NLS_ISO8859_15=m
CONFIG_NLS_KOI8_R=m
CONFIG_NLS_KOI8_U=m
CONFIG_NLS_UTF8=m

#
# Security options
#
# CONFIG_SECURITY is not set

#
# Cryptographic options
#
CONFIG_CRYPTO=y
CONFIG_CRYPTO_HMAC=y
CONFIG_CRYPTO_NULL=m
CONFIG_CRYPTO_MD4=m
CONFIG_CRYPTO_MD5=m
CONFIG_CRYPTO_SHA1=m
CONFIG_CRYPTO_SHA256=m
CONFIG_CRYPTO_SHA512=m
CONFIG_CRYPTO_DES=m
CONFIG_CRYPTO_BLOWFISH=m
CONFIG_CRYPTO_TWOFISH=m
CONFIG_CRYPTO_SERPENT=m
CONFIG_CRYPTO_AES=m
CONFIG_CRYPTO_CAST5=m
CONFIG_CRYPTO_CAST6=m
CONFIG_CRYPTO_DEFLATE=m
CONFIG_CRYPTO_TEST=m

#
# Library routines
#
CONFIG_CRC32=m
CONFIG_ZLIB_INFLATE=m
CONFIG_ZLIB_DEFLATE=m

#
# SCSI support
#
# CONFIG_SCSI is not set

#
# Multi-device support (RAID and LVM)
#
CONFIG_MD=y
CONFIG_BLK_DEV_MD=y
CONFIG_MD_LINEAR=y
CONFIG_MD_RAID0=y
CONFIG_MD_RAID1=y
CONFIG_MD_RAID5=y
CONFIG_MD_RAID6=y
CONFIG_MD_MULTIPATH=y
CONFIG_BLK_DEV_DM=m
CONFIG_DM_IOCTL_V4=y

#
# Memory Technology Devices (MTD)
#
# CONFIG_MTD is not set

#
# Kernel hacking
#
# CONFIG_DEBUG_SLAB is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_INFO is not set

Re: [uml-devel] 2.6 UML Kernel Woes (re UDB Device)

[roland]

mhhhh....
do you use devfs=nomount with your 2.4.x kernel, too?
what about _trying_ devfs?

also see: http://usermodelinux.org/modules.php?name=News&file=article&sid=134

hth
roland


----- Original Message ----- 
From: "William R. Lorenz" <wrl@express.org>
To: <user-mode-linux-devel@lists.sourceforge.net>
Sent: Wednesday, March 10, 2004 8:47 AM
Subject: [uml-devel] 2.6 UML Kernel Woes (re UDB Device)


> Greetings,
> 
> I've grabed the 2.6.3 kernel source an applied uml-patch-2.6.3-rc2-1.bz2
> as made available on the UML site @ SourceForge.  I've then configured the
> kernel with a `make ARCH=um menuconfig`, compiled it with a `make ARCH=um
> linux`, and tried to run it on a 2.4.23 skas3+fairsched patched host.  I
> also added in an MPPE patch for PPTP-related stuff, which should be fine.
> 
> When I run the 2.6.3 binary, I get the following error to the console:
> 
>   VFS: Cannot open root device "ubd0" or unknown-block(0,0)
>   Please append a correct "root=" boot option
>   Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)
> 
> I'm calling the UML binary with the following command-line options:
> 
>   user$ ./linux-2.6.3.mppe.bin devfs=nomount mem=128M \
>     ubd0=fedora-core1.disk \
>     con0=fd:0,fd:1 con=/dev/null \
>     eth0=tuntap,tap3 root=/dev/ubd0
> 
> It's not a permissions problem with the 'fedora-core1.disk' file, as this
> file works just fine with a 2.4.x UML kernel, and it's an ext3 filesystem:
> 
>   [root@phobos linux-2.6.3]# grep EXT3 .config
>   CONFIG_EXT3_FS=y
>   CONFIG_EXT3_FS_XATTR=y
>   CONFIG_EXT3_FS_POSIX_ACL=y
>   # CONFIG_EXT3_FS_SECURITY is not set
>   [root@phobos linux-2.6.3]# grep EXT2 .config
>   CONFIG_EXT2_FS=y
>   # CONFIG_EXT2_FS_XATTR is not set
>   [root@phobos linux-2.6.3]# 
> 
> I've attached the complete kernel .config I used for this 2.6 compilation.
> 
> Any help would be very much appreciated.  Thanks, in advance.
> 
> --          _ 
> __ __ ___ _| | William R. Lorenz <wrl@express.org> 
> \ V  V / '_| | http://www.clevelandlug.net/ ; "Every revolution was 
>  \./\./|_| |_| first a thought in one man's mind." - Ralph Waldo Emerson 
> 


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Re: [uml-devel] 2.6 UML Kernel Woes (re UDB Device)

[Sakari Ailus]

William R. Lorenz wrote:
> When I run the 2.6.3 binary, I get the following error to the console:
> 
>   VFS: Cannot open root device "ubd0" or unknown-block(0,0)
>   Please append a correct "root=" boot option
>   Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)

I also started seeing this with 2.6.4-um1. 2.6.0-um1 was ok.

>     eth0=tuntap,tap3 root=/dev/ubd0

Apparently you can also give root device directly as major/minor pair, 
i.e. root=98:0 in this case. There have been suggestions to change 
/dev/ubd0 to /dev/ubd/0, but in my case that didn't work, I have no idea 
why. Anyway; as the default device is ubd0, root is not even needed... :)

-- 
Sakari Ailus
sakari.ailus@kolumbus.fi


-------------------------------------------------------
This SF.Net email is sponsored by: IBM Linux Tutorials
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