Can't get 11.0-RELEASE to boot on Banana PI M3

[Mark Millard]

On 2016-Nov-25, at 2:57 AM, Hal Murray <hmurray at megapathdsl.net> wrote:


> sperber at deinprogramm.de said:
>> Ah, thanks ... but that's not standard RS232, right?  (BPI homepages says
>> "TTL".)  If it isn't, what kind of hardware connects to that? 
> 
> The normal setup for RS232 is that the transmit and receive signals come out 
> of a big chip (SOC, or PCI UART, or USB UART, or ...) and then go through a 
> level converter which is typically a MAX-232 or one of many clones or 
> variants.  The "TTL" is telling you that it doesn't have that level converter 
> chip.
> 
> You can either add a level converter chip and then plug it into a real RS-232 
> port, or find some setup that also doesn't have the level converter and 
> speaks TTL levels.  Adafruit and probably many others sell a USB UART without 
> the level converter for applications like this.
>  https://www.adafruit.com/product/954

I use one of those from adafruit for a BPi-M3, a RPI2B V1.1, or a Pine64.

> Sometimes, TTL means 3V CMOS levels and 5V from real TTL/CMOS will fry your 
> expensive chip.  Best to check carefully.  The above part says 3V.  It also 
> has an extra power wire that you get to ignore.

===
Mark Millard
markmi at dsl-only.net