[Bug 1807] sparc - rtems_bsp_delay depends on the clock driver

bugzilla-daemon at rtems.org bugzilla-daemon at rtems.org
Mon May 23 21:17:17 UTC 2011


--- Comment #5 from Jiri Gaisler <jiri at gaisler.com> 2011-05-23 16:17:16 CDT ---
Nano-seconds delays are not possible as long as the scaler is programmed to
generate a 1 us tick. ERC32 has a unique scaler for each of the two timers,
while LEON2/3/4 has one single scaler for all timers. Considering that the
maximum frequency for ERC32 is ~ 20 MHz, it does not make much sense of
trying to achieve sub-microsecond delays. LEON processors can run faster, but
have shared scalers so we are kind of stuck at 1 us delays unless we change all
boo-loaders and grmon. I suggest to stick with 1 us minimum delay for now ...

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