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    SubjectRe: Linux 2.6.11.5 on R3912 problems
    OK. Fixed this one myself :-), I had misunderstood the
    MIPS timer stuff and thus the kernel wasn't
    scheduling.

    Mark

    --- Mark Underwood <basicmark@yahoo.com> wrote:

    > Hi,
    >
    > I have now been trying to get Linux 2.6.11.5 (built
    > with gcc 3.3.3 and binutils 2.15.91.0.2) up and
    > running on my Helio PDA, a MIPS R3912 based ASSP
    > (the
    > emulator to be exact) and have been stuck at the
    > last
    > step for a while now :-(.
    >
    > The kernel runs up fine, the problem starts when
    > init
    > is started. Bellow is my kernel log up to freeing
    > init.
    >
    > Uncompressing
    > Linux............................................
    > done, booting the kernel.
    > done decompressing kernel.
    > e_entry: 8016b000, e_ehsize: 52, e_phentsize 32,
    > e_phnum 2,
    > e_shentsize 40, e_shnum 25
    > copying 0x10c320 bytes from file offset 0x80 to
    > address 0x80040000
    > zeroing from 8014c320 to to 8014c320, 0x0 bytes
    > copying 0x36084 bytes from file offset 0x10e000 to
    > address 0x8014e000
    > zeroing from 80184084 to to 80198b58, 0x14ad4 bytes
    > done loading kernel, about to jump in!
    > mips_machgroup 0x00000017, mips_machtype 0x00000000
    > arcs_cmdline: root=1f01 console=ttyS0,115200n8
    > Linux version 2.6.11.5 (mark@stargate) (gcc version
    > 3.3.3) #297 Mon Jul 18 20:19
    > :39 UTC 2005
    > V nasty hack. The Emulator doesn't report which
    > subset
    > of the TX39 family it bel
    > ongs to :,-(. I hope the hardware does!
    > Forcing cpu type to CPU_TX3912
    > CPU revision is: 00002200
    > Determined physical RAM map:
    > memory: 00267000 @ 00199000 (usable)
    > memory: 00400000 @ 02000000 (usable)
    > memory: 00200000 @ 9fc00000 (ROM data)
    > Built 1 zonelists
    > Kernel command line: root=1f01
    > console=ttyS0,115200n8
    > Primary instruction cache 1kB, linesize 16 bytes
    > Primary data cache 1kB, linesize 4 bytes
    > Synthesized TLB handler (17 instructions).
    > Synthesized TLB load handler fastpath (37
    > instructions).
    > Synthesized TLB store handler fastpath (37
    > instructions).
    > Synthesized TLB modify handler fastpath (29
    > instructions).
    > PID hash table entries: 256 (order: 8, 4096 bytes)
    > r39xx_set_termios
    > Dentry cache hash table entries: 8192 (order: 3,
    > 32768
    > bytes)
    > Inode-cache hash table entries: 4096 (order: 2,
    > 16384
    > bytes)
    > Memory: 6168k/6556k available (981k kernel code,
    > 348k
    > reserved, 212k data, 104k
    > init, 0k highmem)
    > Mount-cache hash table entries: 512 (order: 0, 4096
    > bytes)
    > Checking for 'wait' instruction... unavailable.
    > cpu_wait = 0x0
    > Linux NoNET1.0 for Linux 2.6
    > schedule = 0x801327f8. ret = 0
    > Can't analyze prologue code at 80133ea0
    > schedule_timeout = 0x80133ea0. ret = -1
    > sleep_on = 0x8013395c. ret = 0
    > sleep_on_timeout = 0x80133a54. ret = 0
    > wait_for_completion = 0x80133148. ret = 0
    > Serial: r39xx internal UART driver $
    > r39xx_config_port
    > r39xx_request_port
    > ttyS0 at MMIO 0x0r39xx_type
    > (irq = 74) is a R39XX
    > io scheduler noop registered
    > io scheduler anticipatory registered
    > io scheduler deadline registered
    > io scheduler cfq registered
    > RAMDISK driver initialized: 16 RAM disks of 4096K
    > size
    > 1024 blocksize
    > loop: loaded (max 8 devices)
    > Helio Boot ROM: 0x00200000 at 0x9fc00000
    > helio_mtd_map.virt 0x9fc00000
    > Helio Boot ROM: probing for ROM
    > Creating 2 MTD partitions on "Helio Boot ROM":
    > 0x00000000-0x00097eec : "Bootloader + Kernel"
    > mtd: Giving out device 0 to Bootloader + Kernel
    > 0x00097eec-0x0013deec : "cramfs Filesystem"
    > mtd: Giving out device 1 to cramfs Filesystem
    > block2mtd: version $Revision: 1.23 $
    > VFS: Mounted root (cramfs filesystem) readonly.
    > Freeing unused kernel memory: 104k freed
    >
    > I have had to write a UART driver so I thought the
    > problem might be with that so I put lots of debug in
    > tty layer, serial_core and my driver to see what was
    > going on. After doing this and changing the
    > interrupt
    > handler (int-handler.S) I saw the echo that I had
    > put
    > in my inittab.
    > So I started to remove debug and found it stopped
    > working. The strange thing is that it stops before
    > it
    > gets as far as sending the echo from inittab.
    > If I don’t have enough debug the kernel stops just
    > before printing out:
    >
    > Algorithmics/MIPS FPU Emulator v1.5
    >
    > When I connect to the emulator with GDB and look at
    > the registers I find the CPU is still running and is
    > in cpu_idle.
    > I wondered if it might be a timer/task scheduler
    > related problem but as it gets passed the bogomips
    > calculation the timer must be working.
    >
    > Any help would be great as I have been stuck here
    > for
    > a while.
    >
    > Many Thanks,
    >
    > Mark
    >
    >
    >
    >
    >
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    >
    >




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