SPI / X15

Hello all,

     I have problem with activation of MCSPI.

I find out SPI1, SPI2 are used by the User LED's.
with those pins :
A25
F16
B25

A26
B22
...

and about the expansion connector 16, 17

on p16
spi3_cs0 -> P16.3 GPIO4_17 A12
spi3_sclk -> P16.34 GPIO5_10 B12
spi3_d0 -> P16.33 GPIO5_12 B13
spi3_d1 -> P16.4 GPIO5_11 A11

also on p17, we have
SPI3 :
* MMC3_CMD->MMC3_DAT2
* AC4 AC7 AC6 AC9

SPI4 :
* MMC3_DAT4->MMC3_DAT7
* AC8 AD6 AB8 AB5

But where are the enabled SPI port in expansion connector by the kernel ?

Also my question about the CAN port, is it activated by the kernel, in connector p17 ?

Any clear explanation is welcomed