On 3 November 2016 at 20:57, Gene Heskett <[email protected]> wrote:
> I am drowning in a lack of human readable docs here folks, doesn't anyone
> have a life preserver?

Can the human read vhdl?

The actual pin allocations for (for example) 7i90_spi_sssvst8_8_8.bit
would be defined by the file PIN_SSSVST8_8_8_72.vhd

However, if you have what you want on the current pins, does it matter
which bitfile it is?

But, with 8 stepgens and 4 each of pwm/encoder it is going to be
probably 7i90_spi_svst4_8.bit (ie, 4 x servo + 8 x stepper)

That one does give the stepgens a lot of pins, though.

What is your readhmid output? I don't think that what you have is
differential pairs, differential is handled by the daughter-boards.

The vhdl has

IOPortTag & x"00" & StepGenTag & x"81", -- I/O 24
IOPortTag & x"00" & StepGenTag & x"82",   -- I/O 25
IOPortTag & x"00" & StepGenTag & x"83",   -- I/O 26
IOPortTag & x"00" & StepGenTag & x"84",   -- I/O 27
IOPortTag & x"00" & StepGenTag & x"85",   -- I/O 28
IOPortTag & x"00" & StepGenTag & x"86",   -- I/O 29

Which ( 
https://github.com/LinuxCNC/linuxcnc/blob/master/src/hal/drivers/mesa-hostmot2/pins.c#L126
) is

81: "Step";
82: "Direction";
83: "Table2Pin";
84: "Table3Pin";
85: "Table4Pin";
86: "Table5Pin";
87: "Table6Pin";
88: "Table7Pin";

But you won't typically get all those pins. What does dmesg say when
you load the driver?

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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