[SOLVED] SD card not visible on Omega2+
-
Hi,
I have just started working with Omega2+ and the first thing I want to do is to boot from SD card, because I want to use the gcc and g++ compilers and Omega does not have enough memory. However the SD card is not visible at all.
root@Omega-B536:/tmp# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 7936 7936 0 100% /rom tmpfs 62404 240 62164 0% /tmp /dev/mtdblock6 22592 8428 14164 37% /overlay overlayfs:/overlay 22592 8428 14164 37% / tmpfs 512 0 512 0% /dev /dev/mtdblock7 512 196 316 38% /mnt/mtdblock7I read this:
https://community.onion.io/topic/2154/sd-card-needs-to-be-re-plugged-on-reboot
but in my case the SD card cannot be seen either after reboot or after I remove and plug the card back in./mntlooks like this:root@Omega-B536:/mnt# ls mtdblock7/devlooks like this:root@Omega-B536:/dev# ls autofs mtd0ro mtdblock1 snd tty20 tty35 tty5 tty7 bus mtd1 mtdblock2 spidev0.1 tty21 tty36 tty50 tty8 console mtd1ro mtdblock3 tty tty22 tty37 tty51 tty9 cpu_dma_latency mtd2 mtdblock4 tty0 tty23 tty38 tty52 ttyS0 full mtd2ro mtdblock5 tty1 tty24 tty39 tty53 ttyS1 gpiochip0 mtd3 mtdblock6 tty10 tty25 tty4 tty54 ttyS2 gpiochip1 mtd3ro mtdblock7 tty11 tty26 tty40 tty55 uinput gpiochip2 mtd4 network_latency tty12 tty27 tty41 tty56 urandom i2c-0 mtd4ro network_throughput tty13 tty28 tty42 tty57 vcs kmem mtd5 null tty14 tty29 tty43 tty58 vcs1 kmsg mtd5ro port tty15 tty3 tty44 tty59 vcsa ledchain2 mtd6 ppp tty16 tty30 tty45 tty6 vcsa1 log mtd6ro ptmx tty17 tty31 tty46 tty60 watchdog mem mtd7 pts tty18 tty32 tty47 tty61 watchdog0 memory_bandwidth mtd7ro random tty19 tty33 tty48 tty62 zero mtd0 mtdblock0 shm tty2 tty34 tty49 tty63But there is no trace of a 'mmc*' /SD.
I have tried two different SD cards hoping that the problem is the card itself, but nothing changed.
My firmware version is b233.Could someone please help me with this?
-
@Cristian-Bourceanu may I ask why you want to compile on the Omega? It will drive you nuts, why not just cross compile?
-
@crispyoz I didn't know about cross compile. I had just started using Omega, so I am still learning about it.
Thx for your suggestion!
However, I would still like to make the micro SD card useable for future needs.
-
@Cristian-Bourceanu Booting from SD Card is different from using the SD Card. The reason I suggest cross compiling is because you need to consider that the Omega is designed for IoT types of applications so resources are limited. Instead you can develop your apps on your PC under windows/Linux etc with all the features and power that provides, then deploy your app to your Omega. You can even do remote debugging if you need to.
Take a look at cross compiling in the docs (https://docs.onion.io/omega2-docs/cross-compiling.html), the setup is pretty straight forward and many people seem to use the prebuilt docker image available on Onion github (https://github.com/OnionIoT) I'm not personally a fan of using the Docker image or Docker in general but that's a flame war for a later date. I prefer to develop on I linux machine using the Onion source repository as a starting point. (https://github.com/OnionIoT/source)
Regarding the SD Card, assuming you boot as normal you can insert the SDCard and it should automount so you run df to see the mount point.
-
@crispyoz I will follow your advise about cross compiling. Remote debugging sounds very satisfying and can't wait to learn about it.
The SD card did not automount and that was my problem in the first place. I have even factory reset it, but nothing changed. I kind of use all the peripherals(GPIOs) available on the omega, but that shouldn't interfere with the SD unless there are some common connections, but I couldn't confirm that since I didn't find any schematic for Omega2+.
-
@Cristian-Bourceanu which Omega model are you using? Omega2/2+/S/S+/Pro
-
@crispyoz Omega2+
I have designed my own PCB that I connect Omega2+ to. You can check that out here: https://github.com/cristi-bourceanu/Omega2P_FruitingChamber.git
-
Update!
I have disconnected the Omega from the board that I have designed and powered it up separately and now the SD card is discoverable. Thus, something from my PCB is definitely interfering with the SD card. Does anyone have a clue what could be the cause of it?
-
@Cristian-Bourceanu I found my issues with sdcard were due to bad or non-existent gnd on pin 7 of the sdcard slot. Might be worth checking.
-
Solved!
My Omega was controlling some outputs with the help of some transistors. The resistors between Omega and the base of transistors were all 1kohm, which might have been too low for Omega capabilities of 4 mA per GPIO. I replaced all of them with 4k7 and it is now working.I don't even know why I have used such low resitances. I guess I was thinking that if I am not low on power, then why not.
-
@Cristian-Bourceanu said in [SOLVED] SD card not visible on Omega2+:
I have designed my own PCB that I connect Omega2+ to. You can check that out here: https://github.com/cristi-bourceanu/Omega2P_FruitingChamber.git
Please share with us your Eagle schematic(s) in pdf (or png) format too.
-
@György-Farkas
Sure! I have uploaded a PDF schematic on github under the PCB White Rabbit folder.
-
@Cristian-Bourceanu Thanks. Where are those problematic transistors and 1 kOhm resistors?
I'd like to reproduce your "SD card not visible on Omega2+" issue.
-
@György-Farkas I have updated the schematic with the resistors values I was using when the SD card was not visible.
-
@Cristian-Bourceanu Thanks, I will try it.