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Re: [PATCH][respin] pnx8550: fix system timer support

To: linux-mips@linux-mips.org
Subject: Re: [PATCH][respin] pnx8550: fix system timer support
From: Daniel Laird <danieljlaird@hotmail.com>
Date: Wed, 3 Jan 2007 05:37:45 -0800 (PST)
In-reply-to: <8127168.post@talk.nabble.com>
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Daniel Laird wrote:
> 
> 
Thanks, thats the build problem removed, I now have a kernel that builds
properly! (issues 1 and 2 appear to be closed)
Only issue remaining is that I still have a long hang (10 seconds ish) 
after this
Memory: 53540k/57344k available (2156k kernel code, 3744k reserved, 383k
data, 128k init, 0k highmem)
 I am investigating but any help is appreciated...
Dan


I have been debugging this and the delay is all due to the calibrate_delay
function.
If I use a preset lpj all works fine (fast start up)
If I let it calculate it using the logic
while ((loops_per_jiffy <<= 1) != 0) {
    /* wait for "start of" clock tick */
        ticks = jiffies;
    while (ticks == jiffies)
        /* nothing */;
    /* Go .. */
    ticks = jiffies;
    __delay(loops_per_jiffy);
    ticks = jiffies - ticks;
    if (ticks)
        break;
}
Then I get the hang so it seems this is the culprit function, however as for
why this is happening I am still debugging
Cheers
Dan
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