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    SubjectRequest For Help - Embedded x86, Kernel 2.6.33 boots, Mounts JFFS2 rootfs, Stops at init
    Hi All,

    I've been working for a while now getting the x86 U-Boot port up to speed
    to boot a linux kernel

    I now have a root fs (build from Linux-From-Scratch and trimmed to <15M
    using qemu) but all attempts to get any serial console output past
    launching of init have failed.

    I have taken the root fs which successfully boots using qemu and created a
    jffs2 image and flashed it onto one of the on-board flash chips. U-Boot can
    successfully 'ls' the root fs

    My bootags are:

    root=/dev/mtdblock1 rw rootfstype=jffs2 console=ttyS0,115200

    as Linux can mount the root partition:
    [ 1.447819] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
    [ 1.450027] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
    [ 1.452421] serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
    [ 1.505824] brd: module loaded
    [ 1.507350] Uniform Multi-Platform E-IDE driver
    [ 1.509245] ide-gd driver 1.18
    [ 1.512852] Serck eNET flash device: 0x1000000 at 0x10000000
    [ 1.523853] eNET_Flash_0: Found 1 x16 devices at 0x0 in 16-bit bank
    [ 1.524828] Intel/Sharp Extended Query Table at 0x0031
    [ 1.526492] Intel/Sharp Extended Query Table at 0x0031
    [ 1.527492] Using buffer write method
    [ 1.528242] cfi_cmdset_0001: Erase suspend on write enabled
    [ 1.529242] Serck eNET flash device: 0x1000000 at 0x11000000
    [ 1.539872] eNET_Flash_1: Found 1 x16 devices at 0x0 in 16-bit bank
    [ 1.540951] Intel/Sharp Extended Query Table at 0x0031
    [ 1.543632] Intel/Sharp Extended Query Table at 0x0031
    [ 1.544426] Using buffer write method
    [ 1.545495] cfi_cmdset_0001: Erase suspend on write enabled
    [ 1.547452] Serck eNET flash device: 0x80000 at 0x38000000
    [ 1.549664] Found: AMD AM29LV040B
    [ 1.550136] eNET_Boot_Flash: Found 1 x8 devices at 0x0 in 8-bit bank
    [ 1.551136] number of JEDEC chips: 1
    [ 1.551975] Adding Device 0
    [ 1.556819] Partitioning Device 1
    [ 1.558150] Creating 1 MTD partitions on "eNET_Flash_1":
    [ 1.559150] 0x000000000000-0x000001000000 : "rootfs"
    [ 1.563816] Adding Device 2
    [ 1.568821] 8139too Fast Ethernet driver 0.9.28
    [ 1.573803] eth0: RealTek RTL8139 at 0xc8896000, 00:40:f4:6e:67:ac, IRQ 10
    [ 1.578796] eth1: RealTek RTL8139 at 0xc889a100, 00:40:f4:6e:67:ac, IRQ 9
    [ 1.582822] TCP cubic registered
    [ 1.584516] Using IPI Shortcut mode
    [ 1.901864] VFS: Mounted root (jffs2 filesystem) on device 31:1.
    [ 1.902926] Freeing unused kernel memory: 204k freed
    [ 1.909817] Write protecting the kernel text: 1924k
    [ 1.911896] Write protecting the kernel read-only data: 596k
    [ 1.915842] kernel_execve(/sbin/init)

    (I've added a printk in kernel_execve() which gives me the last line)

    I initially had hot-plug support compiled into the kernel and was getting
    a lot of kernel_execve(/sbin/hotplug) messages as well (plus a udev:
    starting version 151 message which appear 100+ seconds and the above
    messages), but I have since removed that and used mknod to create
    /dev/ttyS0 directly

    I have also tried the following test script:

    #!/bin/bash
    stty -F /dev/ttyS0 115200
    cat hello > /dev/ttyS0

    but still no luck

    Does anyone have any advise on how I can debug this problem?

    Regards,

    Graeme


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