* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
@ 2013-03-21 5:14 Stephen Warren
2013-03-21 6:55 ` Wolfgang Denk
0 siblings, 1 reply; 11+ messages in thread
From: Stephen Warren @ 2013-03-21 5:14 UTC (permalink / raw)
To: u-boot
Commit b2f3e0e "console: USB: KBD: Fix incorrect autoboot timeout"
re-wrote the bootdelay timeout loop. However, it hard-coded the value
that get_delay() was expected to increment in one second, rather than
calculating it based on CONFIG_SYS_HZ. On systems where SYS_HZ != 1000,
this caused bootdelay timeout to be incorrect. Fix this.
Cc: Jim Lin <jilin@nvidia.com>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
---
common/main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/common/main.c b/common/main.c
index a15f020..4f81ca9 100644
--- a/common/main.c
+++ b/common/main.c
@@ -264,7 +264,7 @@ int abortboot(int bootdelay)
break;
}
udelay(10000);
- } while (!abort && get_timer(ts) < 1000);
+ } while (!abort && get_timer(ts) < CONFIG_SYS_HZ);
printf("\b\b\b%2d ", bootdelay);
}
--
1.7.10.4
^ permalink raw reply related [flat|nested] 11+ messages in thread* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 5:14 [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000 Stephen Warren
@ 2013-03-21 6:55 ` Wolfgang Denk
2013-03-21 13:50 ` Tom Rini
2013-03-21 16:04 ` Stephen Warren
0 siblings, 2 replies; 11+ messages in thread
From: Wolfgang Denk @ 2013-03-21 6:55 UTC (permalink / raw)
To: u-boot
Dear Stephen Warren,
In message <1363842874-8286-1-git-send-email-swarren@wwwdotorg.org> you wrote:
> Commit b2f3e0e "console: USB: KBD: Fix incorrect autoboot timeout"
> re-wrote the bootdelay timeout loop. However, it hard-coded the value
> that get_delay() was expected to increment in one second, rather than
> calculating it based on CONFIG_SYS_HZ. On systems where SYS_HZ != 1000,
> this caused bootdelay timeout to be incorrect. Fix this.
Are there any such systems left? I agree with your patch, but if you
know of systems that use incorrect values of CONFIG_SYS_HZ then please
point these out so they can be fixed!
A system with CONFIG_SYS_HZ != 1000 is _broken_.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
It is dangerous to be right on a subject on which the established
authorities are wrong. -- Voltaire
^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 6:55 ` Wolfgang Denk
@ 2013-03-21 13:50 ` Tom Rini
2013-03-21 14:35 ` Wolfgang Denk
2013-03-21 16:04 ` Stephen Warren
1 sibling, 1 reply; 11+ messages in thread
From: Tom Rini @ 2013-03-21 13:50 UTC (permalink / raw)
To: u-boot
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 03/21/2013 02:55 AM, Wolfgang Denk wrote:
> Dear Stephen Warren,
>
> In message <1363842874-8286-1-git-send-email-swarren@wwwdotorg.org>
> you wrote:
>> Commit b2f3e0e "console: USB: KBD: Fix incorrect autoboot
>> timeout" re-wrote the bootdelay timeout loop. However, it
>> hard-coded the value that get_delay() was expected to increment
>> in one second, rather than calculating it based on CONFIG_SYS_HZ.
>> On systems where SYS_HZ != 1000, this caused bootdelay timeout to
>> be incorrect. Fix this.
>
> Are there any such systems left? I agree with your patch, but if
> you know of systems that use incorrect values of CONFIG_SYS_HZ then
> please point these out so they can be fixed!
>
> 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).
- --
Tom
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^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 13:50 ` Tom Rini
@ 2013-03-21 14:35 ` Wolfgang Denk
2013-03-21 14:41 ` Tom Rini
0 siblings, 1 reply; 11+ messages in thread
From: Wolfgang Denk @ 2013-03-21 14:35 UTC (permalink / raw)
To: u-boot
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.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"The whole world is about three drinks behind." - Humphrey Bogart
^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 14:35 ` Wolfgang Denk
@ 2013-03-21 14:41 ` Tom Rini
2013-03-21 15:25 ` Jon Hunter
0 siblings, 1 reply; 11+ messages in thread
From: Tom Rini @ 2013-03-21 14:41 UTC (permalink / raw)
To: u-boot
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?
--
Tom
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^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 14:41 ` Tom Rini
@ 2013-03-21 15:25 ` Jon Hunter
2013-03-21 15:28 ` Tom Rini
0 siblings, 1 reply; 11+ messages in thread
From: Jon Hunter @ 2013-03-21 15:25 UTC (permalink / raw)
To: u-boot
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).
Cheers
Jon
^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 15:25 ` Jon Hunter
@ 2013-03-21 15:28 ` Tom Rini
2013-03-21 18:07 ` Jon Hunter
0 siblings, 1 reply; 11+ messages in thread
From: Tom Rini @ 2013-03-21 15:28 UTC (permalink / raw)
To: u-boot
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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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^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 15:28 ` Tom Rini
@ 2013-03-21 18:07 ` Jon Hunter
2013-03-21 18:26 ` Tom Rini
0 siblings, 1 reply; 11+ messages in thread
From: Jon Hunter @ 2013-03-21 18:07 UTC (permalink / raw)
To: u-boot
On 03/21/2013 10:28 AM, Tom Rini wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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!
Looks like the OMAP timers are running faster than 1000Hz but the timer
tick rate is being normalised to 1000Hz by dividing the actual timer
rate by SYS_HZ. I see ...
readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
We could do the same for OMAP2420. In fact we could move
arch/arm/cpu/armv7/omap-common/timer.c to arch/arm/omap-common/timer.c
and use this for OMAP2420. The legacy OMAP2420 code is very similar to this.
Jon
^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 18:07 ` Jon Hunter
@ 2013-03-21 18:26 ` Tom Rini
0 siblings, 0 replies; 11+ messages in thread
From: Tom Rini @ 2013-03-21 18:26 UTC (permalink / raw)
To: u-boot
On Thu, Mar 21, 2013 at 01:07:18PM -0500, Jon Hunter wrote:
>
> On 03/21/2013 10:28 AM, Tom Rini wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > 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!
>
> Looks like the OMAP timers are running faster than 1000Hz but the timer
> tick rate is being normalised to 1000Hz by dividing the actual timer
> rate by SYS_HZ. I see ...
>
> readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
>
> We could do the same for OMAP2420. In fact we could move
> arch/arm/cpu/armv7/omap-common/timer.c to arch/arm/omap-common/timer.c
> and use this for OMAP2420. The legacy OMAP2420 code is very similar to this.
Sounds good to me, thanks!
--
Tom
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^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 6:55 ` Wolfgang Denk
2013-03-21 13:50 ` Tom Rini
@ 2013-03-21 16:04 ` Stephen Warren
2013-03-21 19:17 ` Wolfgang Denk
1 sibling, 1 reply; 11+ messages in thread
From: Stephen Warren @ 2013-03-21 16:04 UTC (permalink / raw)
To: u-boot
On 03/21/2013 12:55 AM, Wolfgang Denk wrote:
> Dear Stephen Warren,
>
> In message <1363842874-8286-1-git-send-email-swarren@wwwdotorg.org> you wrote:
>> Commit b2f3e0e "console: USB: KBD: Fix incorrect autoboot timeout"
>> re-wrote the bootdelay timeout loop. However, it hard-coded the value
>> that get_delay() was expected to increment in one second, rather than
>> calculating it based on CONFIG_SYS_HZ. On systems where SYS_HZ != 1000,
>> this caused bootdelay timeout to be incorrect. Fix this.
>
> Are there any such systems left? I agree with your patch, but if you
> know of systems that use incorrect values of CONFIG_SYS_HZ then please
> point these out so they can be fixed!
>
> A system with CONFIG_SYS_HZ != 1000 is _broken_.
Then why does the config option still exist; surely it should be
removed, or defined somewhere other than the per-board config file?
^ permalink raw reply [flat|nested] 11+ messages in thread
* [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000
2013-03-21 16:04 ` Stephen Warren
@ 2013-03-21 19:17 ` Wolfgang Denk
0 siblings, 0 replies; 11+ messages in thread
From: Wolfgang Denk @ 2013-03-21 19:17 UTC (permalink / raw)
To: u-boot
Dear Stephen Warren,
In message <514B2F8E.2090409@wwwdotorg.org> you wrote:
>
> Then why does the config option still exist; surely it should be
> removed, or defined somewhere other than the per-board config file?
Removing it requires work, including testing efforts...
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
A year spent in artificial intelligence is enough to make one believe
in God.
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2013-03-21 19:17 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-03-21 5:14 [U-Boot] [PATCH] Fix bootdelay timeout calculation when SYS_HZ!=1000 Stephen Warren
2013-03-21 6:55 ` Wolfgang Denk
2013-03-21 13:50 ` Tom Rini
2013-03-21 14:35 ` Wolfgang Denk
2013-03-21 14:41 ` Tom Rini
2013-03-21 15:25 ` Jon Hunter
2013-03-21 15:28 ` Tom Rini
2013-03-21 18:07 ` Jon Hunter
2013-03-21 18:26 ` Tom Rini
2013-03-21 16:04 ` Stephen Warren
2013-03-21 19:17 ` Wolfgang Denk
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