[U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000

[Tom Rini <trini@ti.com>]

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On 03/21/2013 11:25 AM, Jon Hunter wrote:
> 
> On 03/21/2013 09:41 AM, Tom Rini wrote:
>> On Thu, Mar 21, 2013 at 03:35:40PM +0100, Wolfgang Denk wrote:
>>> Dear Tom,
>>> 
>>> In message <514B1036.3090400@ti.com> you wrote:
>>>> 
>>>>> A system with CONFIG_SYS_HZ != 1000 is _broken_.
>>>> 
>>>> So, RPi is going higher, and Jon hit this on I suspect
>>>> omap2420h4 which is also higher (after mathing that all out).
>>>> If we no longer support CONFIG_SYS_HZ != 1000 we need to make
>>>> that clear (and explain why).
>>> 
>>> It has never been supported, so this is not a case of "no
>>> longer". There are several longish threads (about the timer
>>> code, especially on ARM) in the archives.
>> 
>> OK, then we need to do something about these platforms today.
>> I'm guessing RPi can just be tuned down to 1000 but for
>> omap2420h4 it's an interesting value and I don't know about the
>> platform well enough to say what we'd need to do to adapt it.
>> Jon?
> 
> For OMAP2420, we have a choice of using either a 12MHz or 32kHz
> clock to drive the timer. With the 32kHz clock we can get close to
> 1000Hz tick but we cannot get it dead on. That's why OMAP has been
> using 128Hz tick in the kernel as opposed to 100Hz tick in the
> kernel for years (although that was changed recently).

The rest of the OMAP/related platforsm in U-Boot accept that as "good"
enough I guess since they've been setting to 1000 for a while / since
they went in (depending on the platform in particular).  So if you
have time to whack 2420 over and give it some quick testing I'd
appreciate it.  Thanks!

- -- 
Tom
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