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by packetlost 1259 days ago
I'm not sure you could flash over USB either without significant work. There's no UART <-> USB device on the Ox64, so you need to use an external one connected to some GPIO pins. You could maybe build a DFU mode yourself, but I'm somewhat skeptical it would work (though it might be possible, there's 3 cores in the thing). Despite there being not one, but TWO USB ports on the Ox64, neither are used for flashing. The micro USB type B connector is only used for power delivery and the USB-c is primarily intended for being a host device, ie. for plugging in a camera module.

Edit: to clarify, there's a bug in the bootrom that prevents the initialization of the USB device. Newer revisions of the Ox64 may fix this.
1 comments
sylware 1259 days ago
Then:

- how do you run anything with that board if you cannot flash anything, I don't understand?

- I cannot use it as usb keyboard controller because of a bootrom bug? (power/data via usb-c)

Now I am confused.

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packetlost 1259 days ago
You can flash it, but you need to use GPIO pins and UART to do so.

The bootrom bug only prevents you from flashing via the on-board USB-c port. You can use a separate USB <-> UART device plugged into GPIO pins to boot/flash.

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sylware 1259 days ago
How such a massive bug could slip thru?

This is weird.

If resellers with stocks know that, they will send back the boards and ask for a refund.

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packetlost 1259 days ago
I'm told it's a bug in the chip from the upstream supplier (BL808 by Bouffalo Lab), so there's not much they can do. IMO it's not a huge deal, and like I said, you can both flash with UART over GPIO pins or implement a bootloader yourself
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sylware 1259 days ago
I would need a USB<->UART converter and do some soldering, then fix the bootloader to re-enable the USB-C...

meh.

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packetlost 1259 days ago
I mean, you'd need to solder headers onto the board, but otherwise not really. There's JTAG headers pre-soldered that might work too, but I'd have to look at which UART/CPU they're hooked up to.
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imtringued 1259 days ago
You don't need to solder anything.
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imtringued 1259 days ago
You just flash it with your hardware programmer like the rest of the industry. It is not a massive bug at all.
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