[U-Boot-Users] get_timer versus get_ticks

[U-Boot-Users] get_timer versus get_ticks

[Robert Deliën]

Hello,

 

I am currently straightening out lib-mips/time.c to make its granularity
defined by CFG_HZ (=1000) instead of the processor?s frequency at which MIPS
counters normally run.

 

Can somebody explain me what the difference between get_timer and get_ticks
is? Get_timer returns the current value of the timer in 1/CFG_HZ units, as I
would expect. I would expect get_ticks to return the raw counter value, but
that value would useless because there?s no way to tell what speed it?s
running at: get_tbclk is returning CFG_HZ and not the actual counter
incremental frequency. In common/main.c get_ticks is used in conjuction with
get_tbclk as if it were get_timer. This indicates either get_tbclk should be
returning the actual counter incremental frequency, or get_ticks to return
the same value as get_timer(0).

 

I have looked at the PPC implementation, but that wasn?t of much help
because there a hardware time base is used so that solution always correct.

 

Thanks in advance!

 

With kind regards,

 

            Robert.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.denx.de/pipermail/u-boot/attachments/20061208/daa777b0/attachment.htm