When I try to execute echo 'SPI0_slave' > /sys/devices/platform/bone_capemgr/slots, I get the error bash: echo: write error: Invalid argument. A short look into dmesg shows this error: __of_adjust_tree_phandle_references: Illegal property (size) 'fixup' @/__local_fixups__

Do you know what this means? Was not able to find something useful

Hi just a comment --

Referring to the installation instructions, they are great but please put curly braces, i.e. instead of $(CC) you need ${CC} or I get syntax errors everywhere.

Also, you should mention a full kernel build of the kernel source is required BEFORE attempting to build the spi slave module, otherwise the modules will refuse to load on the beaglebone with errors in dmesg like "no symbol version for module_layout"

Also, please include instruction to also upload spi-slave-core.ko and insmod that first, or you'll get unknown symbol errors when inserting the driver.

Finally I believe there is a minimum kernel version required, no? For me the 3.8 series did not work.

Thanks !

Hello,

I have tried to follow the procedure, and I have a problem that I can't solve.

Once I get to this level (after retrieving the .config file) :
make -j3 modules ARCH=arm CROSS_COMPILE=$(CC) LOCALVERSION=-$SOURCE_VERSION 2>&1

I get the following error message:

  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  YACC    scripts/kconfig/zconf.tab.c
/bin/sh: 1: bison: not found
make[2]: *** [scripts/Makefile.lib:196: scripts/kconfig/zconf.tab.c] Error 127
make[2]: *** Attente des tâches non terminées....
  LEX     scripts/kconfig/zconf.lex.c
/bin/sh: 1: flex: not found
make[2]: *** [scripts/Makefile.lib:188: scripts/kconfig/zconf.lex.c] Error 127
make[1]: *** [Makefile:534: syncconfig] Error 2
make: *** [Makefile:633: include/config/auto.conf.cmd] Error 2

Note: the previous compilation did not pose any problem:
make -j3 mrproper ARCH=arm CROSS_COMPILE=$(CC) LOCALVERSION=-$SOURCE_VERSION
It's OK.

Do you have any idea where the problem might come from?
I am working on the version : 4.19.94-ti-r42

Thanks!

If anyone happens to be watching this. Running 4.14.71-ti-r80 and I've managed to sort of get things going. The overlay and kernel modules load with no errors and device appears and can be opened but it doesn't seem like it's able to send or receive. I have it connected to another Beaglebone running as a master that loops back data just fine. Just running into a wall as how to further debug this.

Hi

after loading the cape and drivers, there is no spi device created in /dev.
This is with kernel 4.4.30-ti-r64. I've 'successfully' used insmod - all I see in dmesg is, after loading spislave core, the message :

spislavecore: function: init

Then I loaded spi-mcspi-slave.ko.
Any ideas on what might have gone wrong? I have confirmed the SPI0_slave cape is the only one loaded and that spi_omap2_mcspi is blacklisted.

edit: I also tried the SPI1_slave cape to no effect. It doesn't look like the driver is properly initializing.

Can you let me know what kernel version I should be using for this to work?

First I wanted to thank you.
i have a problem while compiling your driver
i edit the make file with my kernel version

ARCH := arm
COMPILER := /home/circle/Desktop/spi_proj/gcc-linaro-5.3-2016.02-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
COMPILER_V := gcc
PWD := $(shell pwd)
KERN_V=3.8.13
BUILD_V=-bone79
SOURCE=linux-stable-rcn-ee
SUBDIRS=firmware/

KDIR := $(PWD)/$(SOURCE)-$(KERN_V)$(BUILD_V)

obj-m+= driver/spi-slave-core.o driver/spi-slave-debug.o driver/spi-slave-dev.o driver/spi-mcspi-slave.o 

all:
	$(MAKE) -C $(KDIR) M=$(PWD) ARCH=$(ARCH) CROSS_COMPILE=$(COMPILER) modules
	$(COMPILER)$(COMPILER_V) -o slave_app/slave_app slave_app/slave_app.c

clean:
	$(MAKE) -C $(KDIR) M=$(PWD) ARCH=$(ARCH) clean

when i try to compile i get a lot of
error: implicit declaration of function
from each c file
i try to add the prototype of function for each error from here
http://elixir.free-electrons.com/linux/latest/ident/
didnt help
and also try to include all the header file where the function is first Defined
still didnt mange to compile it
any ideas?

Hello,

Since updating to your latest code, I am unable to compile.
I receive the following errors.
/root/github/SPI_slave_driver_implementation/driver/spi-slave-dev.c:279:3: error: implicit declaration of function 'idr_pre_get' [-Werror=implicit-function-declaration]
if (!idr_pre_get(&spislave_idr, GFP_KERNEL) == 0) {
^
/root/github/SPI_slave_driver_implementation/driver/spi-slave-dev.c:285:3: error: implicit declaration of function 'idr_get_new' [-Werror=implicit-function-declaration]
ret = idr_get_new(&spislave_idr, data, &data_id);
^

I've tried kernel 4.4.9-bone10 and 4.4.9-ti-r25

Any thoughts?

Thanks.

Hi,

Great work with your SPI slave driver. It seems to be working great as a stand alone SPI slave.
Unfortunately I can't complete a successful test when I am using only a single BBB in a master & slave configuration.
I am running 4.4.9-bone10.
I have pins:
P9_19 to P9_30
P9_20 TO P9_32
P9_23 TO P9_31
P9_24 TO P9_33
which matches your drawing.

Which dts files should I echo to slots? Do I need to blacklist spi_omap2_mcspi when running in this configuration?

Thanks.