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I noticed that the Booter contains support for external clocking onthe serial ports. How do I use this feature?

April 26, 2017booter clocking external feature noticed onthe ports serial support

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I noticed that the Booter contains support for external clocking onthe serial ports. How do I use this feature?

1 Answer

0

10 Posted

At the moment, you don’t. When the NetBSD/mac68k serial driver was converted to use the machine-independent version of the driver, this feature managed to break. According to Bill Studenmund (wrstuden@loki.stanford.edu): The problem is there’s a race condition with the present open code. If we have an external clock, we will enable interrupts before we have a chance to realize we shouldn’t enable the status interrupt on that pin. A clock on the CTS pin will be ok, with a minor change to the kernel (the #if 0 on line 825 of /src/sys/dev/ic/z8530tty.c needs to be an #if 1) (the CTS status interrupt isn’t enabled by default. 😉 Work is in progress to re-enable this feature.