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The driver is compiled into the RevPi kernel, so as before only the piControl module needs to be loaded to communicate with the RevPi devices. When building your own kernel from our kernel source repository, the driver can optionally be built as an independent kernel module "pibridge.ko". For this the configuration parameter CONFIG_SERIAL_DEV_MUX_PIBRIDGE must be changed from 'y' to 'm' in the kernel configuration. When using the pibridge driver as a standalone kernel module, it must be loaded before loading the piControl module.
One result of the reworked architecture is that latency for of the communication with connected RevPi modules has decreased, so that now shorter cycle times are achieved when querying and setting device state.
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The timestamping feature has been deactivated for the PCF2127. This works around a hardware erratum where a bit in one of the RTC interrupt registers was set by mistake during a warm restart. The erroneous erroneously set bit led to a malfunction of the watchdog on the Connect 4.
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