Public bug reported: On released (and apt updated) 20.04 armhf preinstalled server on Pi3B+, we cannot use pigpio C program to access memory map for gpio. Customer says the same code works fine on 18.04.
ubuntu@ubuntu:~$ sudo ./pigpio/kyle.o 2020-07-31 18:36:11 initPeripherals: mmap gpio failed (Operation not permitted) Details on code below, but the executable is attached, and the customer says this fairly represents their code usage. ubuntu@ubuntu:~/pigpio$ uname -a Linux ubuntu 5.4.0-1015-raspi #15-Ubuntu SMP Fri Jul 10 05:37:25 UTC 2020 armv7l armv7l armv7l GNU/Linux We thought perhaps these kernel configs were involved: CONFIG_DEVMEM=y CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y CONFIG_STRICT_DEVMEM=y ... and we modified the kernel cmdline with the following, but the result was the same. iomem=relaxed strict-devmem=0 The program is simply this https://github.com/joan2937/pigpio/ with make & make install then this c file: #include <pigpio.h> #include <stdio.h> #include <stdlib.h> int main(void){ gpioInitialise(); } built with gcc -Wall -I/home/ubuntu/pigpio -pthread -o kyle.o kyle.c -lpigpio -lrt ** Affects: linux-raspi (Ubuntu) Importance: Undecided Status: New ** Attachment added: "kyle.o" https://bugs.launchpad.net/bugs/1889926/+attachment/5397526/+files/kyle.o ** Description changed: On released (and apt updated) 20.04 armhf preinstalled server on Pi3B+, - we cannot use pigpio C program to access memory map for gpio. + we cannot use pigpio C program to access memory map for gpio. Customer + says the same code works fine on 18.04. - ubuntu@ubuntu:~$ sudo ./pigpio/kyle.o + ubuntu@ubuntu:~$ sudo ./pigpio/kyle.o 2020-07-31 18:36:11 initPeripherals: mmap gpio failed (Operation not permitted) Details on code below, but the executable is attached, and the customer says this fairly represents their code usage. ubuntu@ubuntu:~/pigpio$ uname -a Linux ubuntu 5.4.0-1015-raspi #15-Ubuntu SMP Fri Jul 10 05:37:25 UTC 2020 armv7l armv7l armv7l GNU/Linux We thought perhaps these kernel configs were involved: CONFIG_DEVMEM=y CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y CONFIG_STRICT_DEVMEM=y ... and we modified the kernel cmdline with the following, but the result was the same. iomem=relaxed strict-devmem=0 The program is simply this https://github.com/joan2937/pigpio/ with make & make install then this c file: #include <pigpio.h> #include <stdio.h> #include <stdlib.h> int main(void){ gpioInitialise(); } built with gcc -Wall -I/home/ubuntu/pigpio -pthread -o kyle.o kyle.c -lpigpio -lrt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1889926 Title: Can't access gpio mapped memory on focal armhf server on pi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1889926/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
