On 02/04/15 03:22, Chris Johns wrote:
On 1/04/2015 7:07 pm, Alexander Krutwig wrote:
during my work with FreeBSD timecounters, I found out that the FreeBSD
timecounters start with an uptime value of 1 second. Developers of
FreeBSD told me that this is due to problems in the ARP code.
RTEMS uptime is initialized to an uptime value to 0 seconds.
Are there any problems if the configuration of the RTEMS uptime is also
initialized to 1 second for synchonization? Else, we would have
different values for different API functions which is the second option.
Are saying there are requirements around for systems to have networking
up and running with the first second after RTEMS starting ? I am
impressed you can boot, start the BSP timer running, files system up and
working (flash?), initialised the network stack and have a valid link
all within one 1 second.
How long does a recent GigE PHY take to negotiate a link with a switch ?
See also:
https://lists.freebsd.org/pipermail/freebsd-hackers/2015-April/047504.html
https://lists.freebsd.org/pipermail/freebsd-hackers/2015-April/047510.html
The FreeBSD network stack is quite complex and I am not able to judge if
a change in this area is correct or not.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
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Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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