08-19-2018, 01:50 PM
I was able to consistently flash the other eMMC using either board and failed consistently with the other. Tried several times, so, yeah. I don't think the flashing method I used had any verification whatsoever, though, and I'd love to get a bit more information on how/why it failed other than that the board didn't come online.
I was digging my coffers for USB serial adapters but the ones I found had CH340G and didn't seem to work with 1.5M bps. I did find one ESP32 board that had CP2102 on it. I tried the old Arduino trick of using it as the USB serial adapter by connecting RST (actually, EN) to GND but it didn't seem to work. I suspect ESP32 keeps pulling TX low even if the reset pin is pulled low.
I ordered the eMMC USB adapter and the serial adapter from PINE64 store. Once they arrive, I'll be able to decisively tell that the eMMC is defective. Meh. Hate waiting. :-)
I was digging my coffers for USB serial adapters but the ones I found had CH340G and didn't seem to work with 1.5M bps. I did find one ESP32 board that had CP2102 on it. I tried the old Arduino trick of using it as the USB serial adapter by connecting RST (actually, EN) to GND but it didn't seem to work. I suspect ESP32 keeps pulling TX low even if the reset pin is pulled low.
I ordered the eMMC USB adapter and the serial adapter from PINE64 store. Once they arrive, I'll be able to decisively tell that the eMMC is defective. Meh. Hate waiting. :-)