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    SubjectRe: hwrng on 82801EB/ER (ICH5/ICH5R) fails rngtest checks
    Date
    On Wednesday 26 July 2006 16:52, gmu 2k6 wrote:
    > On 7/26/06, Michael Buesch <mb@bu3sch.de> wrote:
    > > On Wednesday 26 July 2006 16:21, gmu 2k6 wrote:
    > > > it just outputs this and stops with 2.6.18-rc2-HEAD (see dmesg for hashcode or
    > > > whatever that is which is appended as localversion)
    > > >
    > > > svn:~# hexdump /dev/hwrng
    > > > 0000000 ffff ffff ffff ffff ffff ffff ffff ffff
    > > > *
    > > >
    > > > with 2.6.17.6:
    > > > svn:~# hexdump /dev/hwrng
    > > > 0000000 ffff ffff ffff ffff ffff ffff ffff ffff
    > > > *
    > > >
    > > > this was without any rng-tools installed and no rngd running of course.
    > >
    > > Hm, so I would say the hardware either broken, or intel
    > > changed the way to read the random data from it. But I doubt they
    > > would change something like this on the ICH5.
    > >
    > > Who wrote the ICH driver? Jeff? Philipp?
    > > What do you think?
    >
    > IIRC it was Jeff.

    "What do you think?" was more a question to Jeff or Philipp ;)



    But could you try the following patch on top of latest git?
    It's just a random test, but I think it's worth trying.
    Let's see if it works around the issue.

    Index: linux-2.6/drivers/char/hw_random/intel-rng.c
    ===================================================================
    --- linux-2.6.orig/drivers/char/hw_random/intel-rng.c 2006-06-27 17:48:13.000000000 +0200
    +++ linux-2.6/drivers/char/hw_random/intel-rng.c 2006-07-26 17:27:03.000000000 +0200
    @@ -104,9 +104,14 @@
    int err = -EIO;

    hw_status = hwstatus_get(mem);
    + hw_status = hwstatus_set(mem, hw_status & ~INTEL_RNG_ENABLED);
    + hw_status = hwstatus_set(mem, hw_status | INTEL_RNG_ENABLED);
    +#if 0
    + hw_status = hwstatus_get(mem);
    /* turn RNG h/w on, if it's off */
    if ((hw_status & INTEL_RNG_ENABLED) == 0)
    hw_status = hwstatus_set(mem, hw_status | INTEL_RNG_ENABLED);
    +#endif
    if ((hw_status & INTEL_RNG_ENABLED) == 0) {
    printk(KERN_ERR PFX "cannot enable RNG, aborting\n");
    goto out;

    --
    Greetings Michael.
    -
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