Choose between Raspberry Pi 4B 4GB and ROCKPro64

[John-Mark Gurney]

Bernd Walter wrote this message on Tue, Nov 12, 2019 at 23:16 +0100:
> On Tue, Nov 12, 2019 at 08:09:38AM -0700, Klaus Küchemann via freebsd-arm wrote:
> > <<The u-boot has to go into the SPI-Flash or on the card? >>
> > 
> > onto the uSD :
> > https://www.freshports.org/sysutils/u-boot-rockpro64/
> > Regards 
> > Klaus
> 
> Thank you.
> 
> Do you know the bps rate used by u-boot and later components?
> I do see some output at the usual 115200 bps, but it is messed up.
> Also tried other typical bps rates, including 1.5Mbps as mentioned
> on the RockPro Wiki, but none worked.
> I wouldn't rule out that it is the USB uart failing at 1.5M though,
> but I've tried a PL2303, CP2102 (which refused 1.5Mbps) and
> a CH340.
> Unfortunately I don't have an FTDI based TTL one at hands.
> It also fails with reading the uartt output when booting an Armbian
> image, which as such is booting fine according to the HDMI output.

It's 1.5Mbps, aka 1500000.  I'm using the CH340G that they sell:
https://store.pine64.org/?product=padi-serial-console

And it works, but it will occasionally drop characters.

None of my other serial adapters could do the speed necessary.

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."