-> this has been solved by adding a 3300uF capacitor on top of the already existing USB-CAP capacitors.
-> using a two meter long cable also does the trick.
Is there any side effect to use a 3300uF on top of the original 2 * 1000uF of USB-CAP ?
Thanks for the info. In the meantime I was editing my post.
I managed to establish network connection. But I was facing strong stability problems with the material I bought from Olimex.
Now, some are solved, but there are still instability problems I cannot figure out if this is pure hardware related.
It is difficult to reproduce so it will take time for me to have clear information.
wvdial#without success: the modem is not able to establish anymore a connection.
Does anyone has a clue what would be a good "reset" sequence for the modem ?
or 2) try to switchoff the usb line (the same sequence which is done when the main power line is unplugged).
Does anyone have an idea how to reproduce the switchoff sequence ?
reset the entire USB subsystem the hard way I think.
Thanks lambda, very useful information.
The goal is indeed an unattended headless system.
- https://www.olimex.com/wiki/IMX233 tells it is an Un-official image. So I thought it would be better to go for arch.
I will give it a try. Would https://wiki.openwrt.org/toh/olimex/imx233-olinuxino be a good start ?
I guess "official" mostly means that it uses the kernel from the Freescale BSP, which supports all the HW but is hopelessly outdated. Those drivers not merged mainline yet, probably aren't of good quality anyway, but people needing TVout, etc. have no other choice.
I think a number of people on this forum are doing a good job at fixing any kernel bugs that are reported here. So using mainline if possible is what I recommend.
Would https://wiki.openwrt.org/toh/olimex/imx233-olinuxino be a good start ?
I am trying to install openwrt but few things are not clear.
is missing. What should I use?
where should I find it?
google will find you both the dtb and how to create it. I searched on just its name and got both.
Perhaps you could contact the appropriate person/people for OpenWRT to let them know this file isn't there / needs help with how to create?
but are very old and outdated. Indeed I wasn't able to update/upgrade the system or to install simple programs such nano or rsync.
Basically it is download uboot, kernel and rootfs from http://downloads.openwrt.org/snapshots/trunk/mxs/generic/ and prepare a SD-card like described in the wiki page.
I understand my question may be very naive, but for whom is not IT engeneering as me, it is turning to be very difficult to make these boards to work since with archlinux I have the issue with wifi I was asking in my topic.
I am wondering why it seems that I am the only one who has this issue!?
imx233 is quite old so maybe few still use them and even fewer want updated Linux?
sorry if my instructions have been to short to be useful.
If you have issues installing openwrt, feel free to ask here in the forum.
least that's what I'm using.
remember the default configuration of u-boot, but hopefully this just works.
In this case Olimex should consider to not sell it anymore? Do you suggest something more new that runs Linux with wifi, uext mod, USB and has very "small and minimal" compatible board (like imx233 nano)?
Indeed I think it is very usefull the possibility to prepare the SDcard working with the imx233 maxi and then move it to imx233 mini or nano board.
Thank you lambda, I'll try asap!
Anyone who already uses them and wants more would be denied them if Olimex did as you say - which would be very bad.
That does not mean people should adopt them in new designs. That needs proper informed thought. It's up to the potential buyer to inform themselves, as with any purchase.