With this sequence of patches
fa59679 rtapi_vsnprintf: arm IS_IEEE754
7e58eae rtapi_vsnprintf: Fix float formatting for !IS_IEEE754
37bc194 rtapi_bitops: fall back to implementation based on gcc intrinsics
b34c2ee uspace: use rtapi_get_time to implement rtapi_get_clocks if
necessary
the master branch now builds on a Samsung ARM Chromebook and passes all
142 tests. However, as I related earlier[1], there are some technical
problems with how ARM CPUs load and store double-precision
floating-point values that are concerning for the HAL model of data
exchange.
Anyway, at this point it would become feasible to merge ARM-based
drivers if anyone still interested in contributing to LinuxCNC wants to
work on them. This includes the possibility of adapting "hal_gpio.c"
("Driver for the Raspberry Pi GPIO pins") or "hal_pru_generic" ("HAL
module to communicate with PRU" [beaglebone black]) from the
unified-build-3 branch.
Personally, I don't plan to do any ARM driver work at the moment. I
occasionally like to develop LinuxCNC when I only have the Chromebook,
so the work above is enough to scratch my own personal itch.
Jeff
[1]: http://mid.gmane.org/20140702141237.GB65254%40unpythonic.net
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