Conversion to BSPs

[Sebastian Huber]

On 09/04/15 14:00, Joel Sherrill wrote:
> On April 9, 2015 4:11:14 AM CDT, Alexander Krutwig<alexander.krutwig at embedded-brains.de>  wrote:
>> >Hello,
>> >
>> >the newest Timecounter patch was sent yesterday. As of now, the
>> >replacement of the nanoseconds extension with FreeBSD timecounters will
>> >
>> >also be started for the remaining BSPs. Exemplarily, the changes for
>> >the
>> >ERC32-BSP are given in the patch.
> Nice to see this coming along so fast. Any thoughts on the impact of variable length clock ticks? This is often referred to as tickless but I am not as concerned with the use case of dynamically reprogramming the clock tick quantum as advancing time to account for being in a virtualized environment and your "container" not running for a while.
>

In terms of support for tickless systems the situation is slightly 
better. With the nanoseconds extensions this would simply not work. With 
the timecounters it depends on the hardware capabilities. In a tickless 
system large time steps can occur (e.g. you sleep one minute in 
powerdown mode, then wake up, now you have a 1 minute time step). In 
case this time step is larger than your hardware timer interval, then 
you have a problem.

-- 
Sebastian Huber, embedded brains GmbH

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