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    SubjectRe: 2.5 kernels fail to start second CPU
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    > I've got a computer here with a pair of Pentium Pro CPUs in it. 2.4 kernels
    > have no problem starting both CPUs, only later 2.5 kernels (with or without
    > noapic passed on the kernel cmdline).

    Here's the 2.4 boot messages for comparison:

    Linux version 2.4.18-5smp (bhcompile@daffy.perf.redhat.com) (gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)) #1 SMP Mon Jun 10 15:19:40 EDT 2002
    BIOS-provided physical RAM map:
    BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
    BIOS-e820: 0000000000100000 - 0000000008000000 (usable)
    BIOS-e820: 00000000fec00000 - 00000000fec09000 (reserved)
    BIOS-e820: 00000000ffe80000 - 0000000100000000 (reserved)
    0MB HIGHMEM available.
    128MB LOWMEM available.
    found SMP MP-table at 000f8120
    hm, page 000f8000 reserved twice.
    hm, page 000f9000 reserved twice.
    hm, page 000f8000 reserved twice.
    hm, page 000f9000 reserved twice.
    On node 0 totalpages: 32768
    zone(0): 4096 pages.
    zone(1): 28672 pages.
    zone(2): 0 pages.
    Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
    OEM ID: INTEL Product ID: PR440FX APIC at: 0xFEC08000
    Processor #0 Pentium(tm) Pro APIC version 17
    Processor #12 Pentium(tm) Pro APIC version 17
    I/O APIC #13 Version 17 at 0xFEC00000.
    Processors: 2
    Kernel command line: ro root=/dev/hda2 console=ttyS0,115200 console=tty0 noapic
    Initializing CPU#0
    Detected 198.668 MHz processor.
    Console: colour VGA+ 80x25
    Calibrating delay loop... 396.49 BogoMIPS
    Memory: 125600k/131072k available (1232k kernel code, 5084k reserved, 853k data, 316k init, 0k highmem)
    Dentry cache hash table entries: 16384 (order: 5, 131072 bytes)
    Inode cache hash table entries: 8192 (order: 4, 65536 bytes)
    Mount cache hash table entries: 2048 (order: 2, 16384 bytes)
    Buffer cache hash table entries: 8192 (order: 3, 32768 bytes)
    Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
    CPU: L1 I cache: 8K, L1 D cache: 8K
    CPU: L2 cache: 256K
    Intel machine check architecture supported.
    Intel machine check reporting enabled on CPU#0.
    Checking 'hlt' instruction... OK.
    POSIX conformance testing by UNIFIX
    mtrr: v1.40 (20010327) Richard Gooch (rgooch@atnf.csiro.au)
    mtrr: detected mtrr type: Intel
    CPU: L1 I cache: 8K, L1 D cache: 8K
    CPU: L2 cache: 256K
    Intel machine check reporting enabled on CPU#0.
    CPU0: Intel Pentium Pro stepping 09
    per-CPU timeslice cutoff: 733.84 usecs.
    task migration cache decay timeout: 10 msecs.
    enabled ExtINT on CPU#0
    ESR value before enabling vector: 00000040
    ESR value after enabling vector: 00000000
    Booting processor 1/12 eip 2000
    Initializing CPU#1
    masked ExtINT on CPU#1
    ESR value before enabling vector: 00000000
    ESR value after enabling vector: 00000000
    Calibrating delay loop... 396.49 BogoMIPS
    CPU: L1 I cache: 8K, L1 D cache: 8K
    CPU: L2 cache: 256K
    Intel machine check reporting enabled on CPU#1.
    CPU1: Intel Pentium Pro stepping 09
    Total of 2 processors activated (792.98 BogoMIPS).
    Using local APIC timer interrupts.
    calibrating APIC timer ...
    ..... CPU clock speed is 198.6715 MHz.
    ..... host bus clock speed is 66.2235 MHz.
    cpu: 0, clocks: 662235, slice: 220745
    CPU0<T0:662224,T1:441472,D:7,S:220745,C:662235>
    cpu: 1, clocks: 662235, slice: 220745
    CPU1<T0:662224,T1:220720,D:14,S:220745,C:662235>
    checking TSC synchronization across CPUs: passed.
    migration_task 0 on cpu=0
    migration_task 1 on cpu=1
    PCI: PCI BIOS revision 2.10 entry at 0xfda11, last bus=0
    PCI: Using configuration type 1
    PCI: Probing PCI hardware
    Limiting direct PCI/PCI transfers.
    Activating ISA DMA hang workarounds.
    isapnp: Scanning for PnP cards...
    isapnp: Card 'CS4236 Audio'
    isapnp: 1 Plug & Play card detected total
    Linux NET4.0 for Linux 2.4
    Based upon Swansea University Computer Society NET3.039
    Initializing RT netlink socket
    apm: BIOS not found.
    Starting kswapd
    VFS: Diskquotas version dquot_6.5.0 initialized
    pty: 2048 Unix98 ptys configured
    Serial driver version 5.05c (2001-07-08) with MANY_PORTS MULTIPORT SHARE_IRQ SERIAL_PCI ISAPNP enabled
    ttyS00 at 0x03f8 (irq = 4) is a 16550A
    ttyS01 at 0x02f8 (irq = 3) is a 16550A
    ttyS02 at 0x03e8 (irq = 4) is a 16550A
    ttyS03 at 0x02e8 (irq = 3) is a 16550A
    Real Time Clock Driver v1.10e
    block: 240 slots per queue, batch=60
    Uniform Multi-Platform E-IDE driver Revision: 6.31
    ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    PIIX3: IDE controller on PCI bus 00 dev 39
    PIIX3: chipset revision 0
    PIIX3: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:pio, hdb:pio
    hda: IBM-DTLA-307045, ATA DISK drive
    ide2: ports already in use, skipping probe
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    blk: queue c03d0e84, I/O limit 4095Mb (mask 0xffffffff)
    hda: 90069840 sectors (46116 MB) w/1916KiB Cache, CHS=5606/255/63, (U)DMA
    ide-floppy driver 0.99.newide
    Partition check:
    hda: hda1 hda2 hda3 hda4 < hda5 hda6 >
    Floppy drive(s): fd0 is 1.44M
    FDC 0 is a National Semiconductor PC87306
    RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
    ide-floppy driver 0.99.newide
    md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
    md: Autodetecting RAID arrays.
    md: autorun ...
    md: ... autorun DONE.
    pci_hotplug: PCI Hot Plug PCI Core version: 0.4
    NET4: Linux TCP/IP 1.0 for NET4.0
    IP Protocols: ICMP, UDP, TCP, IGMP
    IP: routing cache hash table of 1024 buckets, 8Kbytes
    TCP: Hash tables configured (established 8192 bind 8192)
    Linux IP multicast router 0.06 plus PIM-SM
    NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
    RAMDISK: Compressed image found at block 0
    Freeing initrd memory: 244k freed
    VFS: Mounted root (ext2 filesystem).
    SCSI subsystem driver Revision: 1.00
    kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2
    scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.6
    <Adaptec aic7880 Ultra SCSI adapter>
    aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs

    Journalled Block Device driver loaded
    kjournald starting. Commit interval 5 seconds
    EXT3-fs: mounted filesystem with ordered data mode.
    Freeing unused kernel memory: 316k freed


    David
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