Hi Lionel, since others may run into similar issues, I have forwarded to the mailing list.
> Am 09.07.2017 um 19:27 schrieb L.B. <[email protected]>: > > Hi Nikolaus, > > Thanks for the fast answer. > I tried pushing the AUX switch while inserting the battery but the phone > remains inactive even though that was with the sdcard that I have used so far. Hm. Does no LED light up? Or does some LED blink or stay red? If not it looks more like a drained battery. I have tried the following: 1) use fresh SD card (available as /dev/sdb on my system) umount /dev/sdb* wget -O - http://download.goldelico.com/gta04-main/production/20150318-gta04.dd.bz2 | bunzip2 >/dev/sdb 2) boot with this card (pressing AUX) The power LED should blink red/green while flashing is being done. This installs back the "old style" U-Boot. 3) I had to repeat 2 or 3 times to be able to boot the kernel completely from the SD card 4) Boot another SD card with latest boot system created by DEV=/dev/sdb ./makesd gta04 This installs the "new style" U-Boot system in NAND flash. 5) this also needed 2 or 3 repeats Maybe it has to shake up things in U-Boot environment in NAND until everything fits. 6) then I could boot an SD card without MLO/U-Boot partition. Note that it is not possible to boot from NAND only at this stage. One has to run /root/flash-nand (e.g. through ssd [email protected] over USB cable) to install the latest DT based kernel in NAND. The reason is that the "old style" U-Boot does not take care of the DT in NAND like the new one does. Both old and new style U-Boot can load a kernel from SD card. > Unfortunately I do not have a serial cable. It would be the best to find out what is going wrong. > Is it something I can build myself or should I buy one? It can be built yourself - provided you get the correct pre-crimped Molex pico-blade cable end (8 pins). A description for soldering is in the manual http://projects.goldelico.com/p/gta04-main/downloads/47/ in section "6.3.2. Building a cable". The cable should be similar to this one: http://www.molex.com/molex/products/datasheet.jsp?part=active/0151340803_CABLE_ASSEMBLIES.xml except that we need only one end (but you can cut off the second connector). Mouser and DigiKey (and others) seem to have them in stock: 538-15134-0803 / WM15275-ND I think you can get also pre-crimped single wires and the plastic part of the socket: https://www.digikey.com/products/en?mpart=0797580006&v=900 https://www.digikey.com/product-detail/en/molex-llc/0510210800/WM1726-ND/242848 You also need a DB9f socket (preferrably plus case) and likely an FTDI or Prolific RS232 to USB adapter. Please note that the GTA04 has real RS232 interface levels and is not using a 3.3V or 5V UART port like many other SBC. BR, Nikolaus
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