(09-07-2018, 05:27 AM)t4_4t Wrote: OK,
Then, please obtain OS-Image from url below and write it on SD-Card and try it.
https://github.com/ayufan-rock64/linux-build/releases
OS-Image can be small in size, for example the following one
"bionic-minimal-rock64-0.7.9-1067-arm64.img.xz"
If you have eMMC, insert a clamp jumper and disable it.
You should be able to boot from SD-Card with Pin 21 clamped to GND.
Pin 21 does not need to release clamps on the way.
If you can boot it, you can erase the SPI by another means.
If it can not be started with this method,
Please check the connection of pin 21 & pin 20 again.
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If there is no problem with connection but startup is impossible,
It may be in a serious condition.
If unfortunately the situation is above, I do not have any more useful information for you
I don't have eMMC installed but somehow connecting 21 to ground makes difference (well used to).
The image you suggested did not manage to boot the board. I am not a 100% sure anymore if there is something else that I am missing.
The sd card is fine as it boots another rock64 board.
I have tried another card and it does not work either.
TTL serial to UART on 6,8,10 does not show anything. All LEDs are on when power on but no sign of life.
Probably should give up and not waste any more time on this.
Thanks for the help anyway.
Cheers
(09-07-2018, 06:39 AM)z4v4l Wrote: I haven't tried this by myself with spi nor, but it could unbrick your board. There is rockchip devtool. Get it. Install it on a linux host, which you will attach rock64 to. another SBC for example. You need to connect rock64 through usb-usb to the host, without SD and eMMC, holding some button when powering it on. I haven't done this with rock64, but I did so with a rk3368 settopbox. it's probably a reset button. you hold it and while holding, power the board on. for the host it's seen as a otg client. then use rkdevtool utility on the host. it kinda can (should be able to) erase the flash. read the commands on the page in the link.
I will have a look. Not sure what the USB to USB cable is but will google it.
Thanks for the suggestion.