PROCESSOR-SDK-AM62X: help cross compiling on linux

Hi everyone,

i am pretty new working with linux enviroment and i need hand to compile a simple test application on linux machine running Ubuntu 18.04.

I am successfully compiling a simple test program on sk-am62, i've created a file called ee_test.c :

// include file con le strutture per la periferica
#include <linux/i2c-dev.h>
// #include <linux/i2c-smbus.h>
#include <stdio.h>

//indirizzo della EEPROM a cui leggere
#define EE_ADDRESS 		0x51
#define I2C_NUMBER 		0

char dev_prefix[20] = "/dev/i2c-";
char dev_name[20];
int perif_num = 0;
int num;

int main(void) {

	// completa il nome della periferica
	num = snprintf(dev_name, sizeof(dev_name), "%s%d",dev_prefix,perif_num);


	// test per vedere se ha scrittop giusto
	printf("%s\n", dev_name);

  return 0;
}
// eof

if i do that from sk-am62, everything works fine, the programs compile and run without problem.

Now i want to cross compile it on Ubuntu, because working with source files inside sk-am62 is hard, since i don t have a text editor inside arago linux and i don t know how to edit sorce files.

i created a makefile in my Ubuntu:

# -------------------------------------------------------------------------
# Makefile di compilazione per programma di test i2c su linux Arago
# -------------------------------------------------------------------------

PLATFORM=am62x
ARCH=arm64
PSDK_PATH=/home/ema/psdk/
TOOLS_PATH=$(PSDK_PATH)linux-devkit/sysroots/
BIN_PATH=$(TOOLS_PATH)x86_64-arago-linux/usr/bin/
CC_PREFIX=aarch64-none-linux-gnu-

CC = $(BIN_PATH)$(CC_PREFIX)gcc
CC_64 = $(BIN_PATH)$(CC_PREFIX)g++
AR_64 = $(BIN_PATH)$(CC_PREFIX)ar


DBG_FLAGS=-g3 -gdwarf-2 -std=c++11 

SRC=./ee_read.c
OUT=ee_read

INC_PATH=$(TOOLS_PATH)aarch64-linux/usr/include/
INC_LNX_PATH=$(PSDK_PATH)board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/
INC_ASM=$(INC_LNX_PATH)asm-generic/
INC= -I . -I $(INC_PATH) -I $(INC_LNX_PATH) 

#normal
debug:
	$(CC) $(DBG_FLAGS) $(SRC) $(INC) -o $(OUT)

#pulisce compilazione
clean:
	rm -f *.o $(OUT) lib*.a

but when i try to run it, it gives a lot of error in header files, please help to find out what i m doing wrong, here is output result:

/home/ema/psdk/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/aarch64-none-linux-gnu-gcc -g3 -gdwarf-2  ./ee_read.c -I . -I /home/ema/psdk/linux-devkit/sysroots/aarch64-linux/usr/include/ -I /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/  -o ee_read
In file included from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/kcsan-checks.h:7,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/asm/rwonce.h:27,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/compiler.h:248,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/uapi/linux/i2c-dev.h:28,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/i2c-dev.h:12,
                 from ./ee_read.c:13:
/home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/compiler_attributes.h:64: warning: "__always_inline" redefined
   64 | #define __always_inline                 inline __attribute__((__always_inline__))
      | 
In file included from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/stddef.h:5,
                 from /home/ema/psdk/linux-devkit/sysroots/aarch64-linux/usr/include/linux/posix_types.h:5,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/uapi/linux/types.h:14,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/types.h:6,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/uapi/linux/i2c-dev.h:27,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/i2c-dev.h:12,
                 from ./ee_read.c:13:
/home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/uapi/linux/stddef.h:5: note: this is the location of the previous definition
    5 | #define __always_inline inline
      | 
In file included from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/compiler.h:248,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/uapi/linux/i2c-dev.h:28,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/i2c-dev.h:12,
                 from ./ee_read.c:13:
/home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/asm/rwonce.h:64:31: error: expected ‘;’ before ‘unsigned’
   64 | static __no_sanitize_or_inline
      |                               ^
      |                               ;
   65 | unsigned long __read_once_word_nocheck(const void *addr)
      | ~~~~~~~~                       
/home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/asm/rwonce.h:82:28: error: expected ‘;’ before ‘unsigned’
   82 | static __no_kasan_or_inline
      |                            ^
      |                            ;
   83 | unsigned long read_word_at_a_time(const void *addr)
      | ~~~~~~~~                    
In file included from ./ee_read.c:15:
/home/ema/psdk/linux-devkit/sysroots/aarch64-linux/usr/include/stdio.h:77:19: error: conflicting types for ‘ssize_t’
   77 | typedef __ssize_t ssize_t;
      |                   ^~~~~~~
In file included from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/uapi/linux/i2c-dev.h:27,
                 from /home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/i2c-dev.h:12,
                 from ./ee_read.c:13:
/home/ema/psdk/board-support/linux-rt-5.10.109+gitAUTOINC+d9ee8a25c2-gd9ee8a25c2/include/linux/types.h:60:26: note: previous declaration of ‘ssize_t’ was here
   60 | typedef __kernel_ssize_t ssize_t;
      |                          ^~~~~~~
Makefile:29: recipe for target 'debug' failed
make: *** [debug] Error 1

what are the correct paths for include files, to successfully cross-compile?? are there any reference project for cross-compile for this board?

thank you

Emanuele Peruzzi