[Xen-devel] Re: Cannot open root device for dom0

[stevegt@xxxxxxxxxxxxx]

Mark Williamson and I seem to have gotten this sorted out -- while my
xenolinux build was based on a 1.2 pull as of about 24 hours ago, he
built another from a more recent pull (within the last hour or two?),
tossed it to me, and that boots.  I made no other changes, just dropped
his xeno12linux.gz into /boot and told grub to go get it.  I haven't
tried another pull/build myself, but I would expect it would work as
well.  I did notice that Mark's xenolinux was about 80k larger than
mine.

Moral of the story: there may have been something in 1.2 yesterday which
was breaking some block device operations.  If you hit this, do another
pull, mkbuildtree, make clean, etc.

Possible alternative explanation:  I'm using gcc 3.0.  Mark's using
3.2.2.  I'll make sure to post here when I next rebuild, to let folks
know if the compiler was an issue.

Steve

On Fri, Jan 16, 2004 at 05:06:59PM -0800,  wrote:
> 
> Hi All,
> 
> Getting "Cannot open root device" on a pretty vanilla setup.  Xen seems
> to see the device but xenolinux does not.  I'm stumped.
> 
> - Followed Bin's HOWTO, with 1.2 variations as in docs/Xeno-HOWTO
> 
> - /dev/hda1 is the ext3 root partition for a bootable native Linux
>   (debian woody)
> 
> - ext3 and ext2 drivers are both built into xenolinux (i.e. I'm using
>   the default xenolinux .config generated by 'make menuconfig', and have
>   verified CONFIG_EXT3_FS=y)
> 
> Does anyone know why the (failed) modprobe attempt is happening at all,
> since the ext3 driver is built in?
> 
> Steve
> 
> 
> root (hd0,0)
>  Filesystem type is ext2fs, partition type 0x83
> kernel /boot/xen.gz dom0_mem=80000 ser_baud=115200 noreboot ignorebiostables
>    [Multiboot-elf, <0x100000:0x135354:0x1c2ec>, shtab=0x252258, 
> entry=0x100000]
> module /boot/xenolinux.gz root=/dev/hda1 ro 
>    [Multiboot-module @ 0x271000, 0x16992c bytes]
> 
>  __  __            _   ____              
>  \ \/ /___ _ __   / | |___ \    _ __ ___ 
>   \  // _ \ '_ \  | |   __) |__| '__/ __|
>   /  \  __/ | | | | |_ / __/|__| | | (__ 
>  /_/\_\___|_| |_| |_(_)_____|  |_|  \___|
>                                          
>  http://www.cl.cam.ac.uk/netos/xen
>  University of Cambridge Computer Laboratory
> 
>  Xen version 1.2-rc (stevegt@) (gcc version 3.0.4) Thu Jan 15 20:18:59 PST 
> 2004
> 
> Initialised all memory on a 320MB machine
> Reading BIOS drive-info tables at 0xfe761 and 0xfe771
> CPU0: Before vendor init, caps: 0183f9ff 00000000 00000000, vendor = 0
> CPU caps: 0183f9ff 00000000 00000000 00000000
> Initialising domains
> Initialising schedulers
> Initializing CPU#0
> Detected 448.635 MHz processor.
> Local APIC disabled by BIOS -- reenabling.
> Found and enabled local APIC!
> enabled ExtINT on CPU#0
> ESR value before enabling vector: 00000000
> ESR value after enabling vector: 00000000
> Using local APIC timer interrupts.
> Calibrating APIC timer for CPU0...
> ..... CPU speed is 448.6109 MHz.
> ..... Bus speed is 99.6910 MHz.
> ..... bus_scale = 0x00006617
> ACT: Initialising Accurate timers
> Time init:
> .... System Time: 11910629ns
> .... cpu_freq:    00000000:1ABDA3D4
> .... scale:       00000002:3A9E617C
> .... Wall Clock:  1074300816s 0us
> Start schedulers
> PCI: PCI BIOS revision 2.10 entry at 0xfcaee, last bus=2
> PCI: Using configuration type 1
> PCI: Probing PCI hardware
> PCI: Using IRQ router PIIX [8086/7110] at 00:07.0
> Limiting direct PCI/PCI transfers.
> Intel(R) PRO/1000 Network Driver - version 5.2.16
> Copyright (c) 1999-2003 Intel Corporation.
> PCI: Found IRQ 11 for device 00:11.0
> PCI: Sharing IRQ 11 with 00:07.2
> PCI: Sharing IRQ 11 with 01:00.0
> 3c59x: Donald Becker and others. www.scyld.com/network/vortex.html
> 00:11.0: 3Com PCI 3c905B Cyclone 100baseTx at 0xcc00. Vers LK1.1.16
> Uniform Multi-Platform E-IDE driver Revision: 6.31
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> PIIX4: IDE controller on PCI bus 00 dev 39
> PIIX4: chipset revision 1
> PIIX4: not 100% native mode: will probe irqs later
>     ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:DMA
>     ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio
> hda: Maxtor 90640D4, ATA DISK drive
> hdb: Maxtor 52049U4, ATA DISK drive
> hdc: NEC CD-ROM DRIVE:28C, ATAPI CD/DVD-ROM drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15
> hdc: ATAPI 32X CD-ROM drive, 128kB Cache
> Uniform CD-ROM driver Revision: 3.12
> hda: 12594960 sectors (6449 MB) w/256KiB Cache, CHS=784/255/63, UDMA(33)
> hdb: 40020624 sectors (20491 MB) w/2048KiB Cache, CHS=2491/255/63, UDMA(33)
> SCSI subsystem driver Revision: 1.00
> Red Hat/Adaptec aacraid driver (1.1.2 Jan 15 2004 20:21:59)
> Device eth0 opened and ready for use.
> DOM0: Guest OS virtual load address is c0000000
> DOM0: xen_console_init
> DOM0: Linux version 2.4.24-xeno (stevegt@pathfinder) (gcc version 2.95.4 
> 20011002 (Debian prerelease)) #1 Thu Jan 15 22:17:22 PST 2004
> DOM0: On node 0 totalpages: 20000
> DOM0: zone(0): 4096 pages.
> DOM0: zone(1): 15904 pages.
> DOM0: zone(2): 0 pages.
> DOM0: Kernel command line: /boot/xenolinux.gz root=/dev/hda1 ro 
> DOM0: Initializing CPU#0
> DOM0: Xen reported: 448.635 MHz processor.
> DOM0: Console: colour VGA+ 80x25
> DOM0: Calibrating delay loop... 3670.01 BogoMIPS
> DOM0: Memory: 77304k/80000k available (1074k kernel code, 2696k reserved, 
> 309k data, 52k init, 0k highmem)
> DOM0: Dentry cache hash table entries: 16384 (order: 5, 131072 bytes)
> DOM0: Inode cache hash table entries: 8192 (order: 4, 65536 bytes)
> DOM0: Mount cache hash table entries: 512 (order: 0, 4096 bytes)
> DOM0: Buffer cache hash table entries: 4096 (order: 2, 16384 bytes)
> DOM0: Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
> DOM0: CPU: L1 I cache: 16K, L1 D cache: 16K
> DOM0: CPU: L2 cache: 512K
> DOM0: CPU: Intel Pentium II (Deschutes) stepping 02
> DOM0: POSIX conformance testing by UNIFIX
> DOM0: Linux NET4.0 for Linux 2.4
> DOM0: Based upon Swansea University Computer Society NET3.039
> DOM0: Initializing RT netlink socket
> DOM0: Starting kswapd
> DOM0: Journalled Block Device driver loaded
> DOM0: Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx).
> DOM0: Xeno console successfully installed
> DOM0: Successfully installed virtual firewall/router interface
> DOM0: Starting Xeno Balloon driver
> DOM0: Detected PS/2 Mouse Port.
> DOM0: pty: 256 Unix98 ptys configured
> DOM0: RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
> DOM0: loop: loaded (max 8 devices)
> DOM0: NET4: Linux TCP/IP 1.0 for NET4.0
> DOM0: IP Protocols: ICMP, UDP, TCP
> DOM0: IP: routing cache hash table of 512 buckets, 4Kbytes
> DOM0: TCP: Hash tables configured (established 8192 bind 8192)
> DOM0: ip_conntrack version 2.1 (625 buckets, 5000 max) - 292 bytes per 
> conntrack
> DOM0: ip_tables: (C) 2000-2002 Netfilter core team
> DOM0: NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
> DOM0: root_device_name = hda1
> DOM0: kmod: failed to exec /sbin/modprobe -s -k block-major-3, errno = 2
> DOM0: VFS: Cannot open root device "hda1" or 03:01
> DOM0: Please append a correct "root=" boot option
> DOM0: Kernel panic: VFS: Unable to mount root fs on 03:01
> Domain 0 killed: rebooting machine!
> Reboot disabled on cmdline: require manual reset
> 
> 
> 
> 
> -- 
> Stephen G. Traugott  (KG6HDQ)
> UNIX/Linux Infrastructure Architect, TerraLuna LLC
> stevegt@xxxxxxxxxxxxx 
> http://www.stevegt.com -- http://Infrastructures.Org 

-- 
Stephen G. Traugott  (KG6HDQ)
UNIX/Linux Infrastructure Architect, TerraLuna LLC
stevegt@xxxxxxxxxxxxx 
http://www.stevegt.com -- http://Infrastructures.Org 


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