Posts: 7
Joined: Sun Jan 12, 2020 12:18 pm

spidev buf size on Buster OS

Sun Jan 12, 2020 12:26 pm

on previous versions of raspbian (stretch is the latest i tried), i changed the kernel to support spidev module with larger chunk sizes (64kB).
this was don by editing the spidev.c file in linux/drivers/spi/spidev.c as follow:

static unsigned bufsiz = 65536;

this used to work well untill rpi4 with Buster.
currently im getting an error stating that the bufsiz is 4096 which doesnt match my changes.

does Buster/RPI changed the SPI module usage / drivers?

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