[Libre-soc-bugs] [Bug 528] parameter needed in coriolis2 to specify individually which clocks are to have a Clock Tree

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=528

--- Comment #1 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
Jean-Paul:

index f1fc2f61..9877199d 100644
--- a/cumulus/src/plugins/alpha/chip/corona.py
+++ b/cumulus/src/plugins/alpha/chip/corona.py

+    @property
+    def coronaCks ( self ):
+        if self.corona.conf.useClockTree: return self.corona.conf.coronaCks
+        return []
+

this would be parameteriseable in coriolis2/settings.py (or chipConf
dictionary) to allow explicit naming of clocks that were to be an H-Tree.

in the ls180 case these would be:

* JTAG_TCK
* PLL_OUT_CLK

they would *NOT* be:

* JTAG_TCK
* PLL_OUT_CLK
* SYS_CLK

but, note: the IORing clocks would be:

* JTAG_TCK
* SYS_CLK

the H-Tree clocks *are not the same as* the IOring clocks.

this i believe is what we need.  is this easily achievable by simply
modifying corona.Side class coronaCks function to return a user-defined
list?

if so then i could try that.

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