Hello all,
Maybe some will be able to help a bit.
I'm running 2 Raspberries 3B+, with the same old CentOS image, freshly prepared.
Both run raspberrypi2-kernel 4.19.xx
Both Raspberry have a hat, with a valid EEPROM.
On both, the application I'm in charge of, has R/W access to
/sys/class/i2c-adapter/i2c-3/3-0050/eeprom
On one Raspberry, I update the kernel and only the kernel (yum update raspberrypi2-kernel) and I come to 5.4.42.
After reboot, the whole content of /sys/class has changed, regarding I2C.
4.19.94:
[root@Raspberry-DD7BD7 OLD ~]$ ls -al /sys/bus/i2c/devices/ total 0 drwxr-xr-x. 2 root root 0 Jan 1 1970 . drwxr-xr-x. 4 root root 0 Jan 1 1970 .. lrwxrwxrwx. 1 root root 0 Jan 1 1970 3-0050 -> ../../../devices/platform/ffffffff.i2c/i2c-3/3-0050 lrwxrwxrwx. 1 root root 0 Jan 1 1970 i2c-3 -> ../../../devices/platform/ffffffff.i2c/i2c-3 [root@Raspberry-DD7BD7 OLD ~]$ ls -al /sys/bus/i2c/devices/3-0050/eeprom
5.4.42:
[root@CertifBox-8AC500 OLD ~]$ ls -al /sys/class/i2c-adapter/ total 0 drwxr-xr-x. 2 root root 0 Jan 1 1970 . drwxr-xr-x. 54 root root 0 Jan 1 1970 .. lrwxrwxrwx. 1 root root 0 Jun 15 22:53 i2c-11 -> ../../devices/platform/ffffffff.i2c/i2c-11 [root@CertifBox-8AC500 OLD ~]$
Any idea where I can find this EEPROM file ?
A module option, maybe ?
Regards,
Stephan.
Some progress.
I reinstalled a SD and updated manually all the kernel RPMS that I can find.
Only last kernel has this change (5.4.28 is still ok).
On 15-Jun-20 22:59, Stephan GUILLOUX wrote:
Hello all,
Maybe some will be able to help a bit.
I'm running 2 Raspberries 3B+, with the same old CentOS image, freshly prepared.
Both run raspberrypi2-kernel 4.19.xx
Both Raspberry have a hat, with a valid EEPROM.
On both, the application I'm in charge of, has R/W access to
/sys/class/i2c-adapter/i2c-3/3-0050/eeprom
On one Raspberry, I update the kernel and only the kernel (yum update raspberrypi2-kernel) and I come to 5.4.42.
After reboot, the whole content of /sys/class has changed, regarding I2C.
4.19.94:
[root@Raspberry-DD7BD7 OLD ~]$ ls -al /sys/bus/i2c/devices/ total 0 drwxr-xr-x. 2 root root 0 Jan 1 1970 . drwxr-xr-x. 4 root root 0 Jan 1 1970 .. lrwxrwxrwx. 1 root root 0 Jan 1 1970 3-0050 -> ../../../devices/platform/ffffffff.i2c/i2c-3/3-0050 lrwxrwxrwx. 1 root root 0 Jan 1 1970 i2c-3 -> ../../../devices/platform/ffffffff.i2c/i2c-3 [root@Raspberry-DD7BD7 OLD ~]$ ls -al /sys/bus/i2c/devices/3-0050/eeprom
5.4.42:
[root@CertifBox-8AC500 OLD ~]$ ls -al /sys/class/i2c-adapter/ total 0 drwxr-xr-x. 2 root root 0 Jan 1 1970 . drwxr-xr-x. 54 root root 0 Jan 1 1970 .. lrwxrwxrwx. 1 root root 0 Jun 15 22:53 i2c-11 -> ../../devices/platform/ffffffff.i2c/i2c-11 [root@CertifBox-8AC500 OLD ~]$
Any idea where I can find this EEPROM file ?
A module option, maybe ?
Regards,
Stephan.
Arm-dev mailing list Arm-dev@centos.org https://lists.centos.org/mailman/listinfo/arm-dev
Ok. Found it.
Our application is started via SYSTEMCTL at boot time.
In its starting script, I found (simplified view):
| dtoverlay i2c-gpio i2c_gpio_sda=0 i2c_gpio_scl=1|
| echo "24c32 0x50" > /sys/class/i2c-adapter/xxx/new_device|
| hexdump -C /sys/class/i2c-adapter/i2c-3/3-0050/eeprom |
|On 5.4.42, after the call to DTOVERLAY, the path "xxx" changes from "i2c-3" to "i2c-11" ...|
|Then, the ECHO fails, the HEXDUMP too and so on. |
| |
|2 years back, we took this part of code from EEPFLASH.SH (||https://github.com/raspberrypi/hats/tree/master/eepromutils)%7C
|This tool was updated 10 months back, to avoid conflicts on RPI4 (||https://github.com/raspberrypi/hats/commit/42c532fcb2febf4fe57bde6511c31fc0d...), and now, it's written like|
| dtoverlay i2c-gpio i2c_gpio_sda=0 i2c_gpio_scl=1 bus=10|
| |
|This gave my an idea. If I force "bus=3", all works as expected, and I'm able to read the EEPROM. |
|So, ... On 5.4.42, I would say that some i2c-related kernel module has changed its behavior, when "bus" parameter is not set, to avoid some conflict on RPI4 ...|
| |
||
| |
|Stephan. |
| |
||
||On 16-Jun-20 01:07, Stephan GUILLOUX wrote:
Some progress.
I reinstalled a SD and updated manually all the kernel RPMS that I can find.
Only last kernel has this change (5.4.28 is still ok).
On 15-Jun-20 22:59, Stephan GUILLOUX wrote:
Hello all,
Maybe some will be able to help a bit.
I'm running 2 Raspberries 3B+, with the same old CentOS image, freshly prepared.
Both run raspberrypi2-kernel 4.19.xx
Both Raspberry have a hat, with a valid EEPROM.
On both, the application I'm in charge of, has R/W access to
/sys/class/i2c-adapter/i2c-3/3-0050/eeprom
On one Raspberry, I update the kernel and only the kernel (yum update raspberrypi2-kernel) and I come to 5.4.42.
After reboot, the whole content of /sys/class has changed, regarding I2C.
4.19.94:
[root@Raspberry-DD7BD7 OLD ~]$ ls -al /sys/bus/i2c/devices/ total 0 drwxr-xr-x. 2 root root 0 Jan 1 1970 . drwxr-xr-x. 4 root root 0 Jan 1 1970 .. lrwxrwxrwx. 1 root root 0 Jan 1 1970 3-0050 -> ../../../devices/platform/ffffffff.i2c/i2c-3/3-0050 lrwxrwxrwx. 1 root root 0 Jan 1 1970 i2c-3 -> ../../../devices/platform/ffffffff.i2c/i2c-3 [root@Raspberry-DD7BD7 OLD ~]$ ls -al /sys/bus/i2c/devices/3-0050/eeprom
5.4.42:
[root@CertifBox-8AC500 OLD ~]$ ls -al /sys/class/i2c-adapter/ total 0 drwxr-xr-x. 2 root root 0 Jan 1 1970 . drwxr-xr-x. 54 root root 0 Jan 1 1970 .. lrwxrwxrwx. 1 root root 0 Jun 15 22:53 i2c-11 -> ../../devices/platform/ffffffff.i2c/i2c-11 [root@CertifBox-8AC500 OLD ~]$
Any idea where I can find this EEPROM file ?
A module option, maybe ?
Regards,
Stephan.
Arm-dev mailing list Arm-dev@centos.org https://lists.centos.org/mailman/listinfo/arm-dev
Arm-dev mailing list Arm-dev@centos.org https://lists.centos.org/mailman/listinfo/arm-dev
-
Stephan GUILLOUX