Hi all,
Complete error message is...
echo: write error: Invalid argument hwclock: can't open '/dev/misc/rtc': No such file or directory
Would appreciate any help/info and suggestions!
Thanks,
Pete.
asked
echo: write error: Invalid argument hwclock:
Hi Pete,
I hope you have the RTC working by now. I got it working in the end but it took me quite some effort. Nevertheless i made a small step by step guide again it might be helpfull for other people.
In the picture above i see you are trying to run rc.local from /data. It should be located in /etc and should have the right permissions ofcourse. Furthermore before you use the command "i2cdetect -y 1" you always have to execute "modprobe i2c-dev" else i2cdetect won't work.
RTC.zipSteps to install RTC.txtconfig.txt
allright, so what is exactly defined in the rc.local file? For the hardware clock (expander pi I believe you have) the line in rc.local should look like this;
echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
hwclock -s
In the /u-boot/overlays folder should be the following file;
ds1307-rtc-overlay.dtb
It should also be called in the config.txt eg like this (in the [all] section):
dtoverlay=mcp3208:spi0-0-present,i2c-rtc,ds1307-rtc
Last but not least, did you install the the module? If not:
opkg install kernel-module-rtc-ds1307
Hi,
rc.local =
/u-boot/overlays/ =
config.txt =
opkg kernel =
mesg =
[ 1.468997] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck. [ 7.800661] F2FS-fs (sda): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 7.800672] F2FS-fs (sda): Can't find valid F2FS filesystem in 1th superblock [ 7.808865] F2FS-fs (sda): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 7.808874] F2FS-fs (sda): Can't find valid F2FS filesystem in 2th superblock [ 7.816481] F2FS-fs (sda): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 7.816489] F2FS-fs (sda): Can't find valid F2FS filesystem in 1th superblock [ 7.824109] F2FS-fs (sda): Magic Mismatch, valid(0xf2f52010) - read(0x0) [ 7.824117] F2FS-fs (sda): Can't find valid F2FS filesystem in 2th superblock [ 11.551147] i2c i2c-1: new_device: Instantiated device ds1307 at 0x68 [ 11.564314] rtc-ds1307: probe of 1-0068 failed with error -5
Found some other errors while checking with mesg?
If i want to install via opkg install kernel-module-rtc-ds1307
I became the message:
No packages installed or removed.
The relevant section is here I think:
[ 11.551147] i2c i2c-1: new_device: Instantiated device ds1307 at 0x68
[ 11.564314] rtc-ds1307: probe of 1-0068 failed with error -5
what does it do if you manually 'read' the clock? e.g. by simply typing the command
hwclock
(you did double check the content of the .dtb file right? ;-))
Hi,
I get the same no file or directory message...
I've either got something connected wrong or it's not working as intended?
.dtb file checked and double checked... All good! ;-)
