I now have access to a Rock64-4GB (Rock64_V2.0 board); I hope to put FreeBSD on it someday

[Mark Millard]

On 2018-Jan-6, at 8:45 AM, Emmanuel Vadot <manu at bidouilliste.com> wrote:

> On 2018-01-06 17:43, Emmanuel Vadot wrote:
>> On 2018-01-05 15:45, Mark Linimon wrote:
>>> On Fri, Jan 05, 2018 at 06:27:41AM -0800, Mark Millard wrote:
>>>> the early boot baudrate for the console is apparently 1.5Mbit/s
>>> I've had to use minicom.  That's the only thing that I'm sure supports it.
>>> mcl
>> Works fine with tip(1) here using an FDTI usb<->serial, using a
>> PL2303XA doesn't work (but should based on the datasheet), and my
>> CP2108 should work but I haven't tested yet.
> 
> Also my PL2303XA adapter works on linux using minicom but only for RX, that might be a driver issue.

I've been using Serial on an old MacOS X laptop.
I've done more experiments. Here is what I've
observed. . .

For a CH340G, Serial did not allow 1500000
(built-in driver for USB ID 1a86:7523:0254)
but Serial is being updated to allow it. (I
have a preliminary release now, so I have
1500000 support now.)

However, there was extensive dropped text from
sustained output in my limited testing of this
combination.

[The CH340G is from the type of serial console
for the ROCK64 that is sold at pine64.org .]

I got access to a CP2102 and tried it with Serial
(again a built-in driver, but for USB ID
10c4:ea60:0100). There is far less dropped text,
although it does happen on occasion for sustained
serial output.

I've not tried a FT232R with Serial (AppleUSBFTDI
driver for USB ID 0403:6001:0600) but could have
access to do so.

I've not tried a LP2303X/HX/TA with Serial
(built-in driver for USB ID 067b:2303:0300) but
could have access to do so.

(The device identifications are as reported by
Serial, both USB ID and "Chip" name.)



As stands for ubuntu 16.04's top on the ROCK64,
running via a 70 line window in Serial, I've
yet to see a screen update that looked completely
good.

But most lines for the CP2102 and Serial
combination look good for each update so far.

By contrast, the CH340G with Serial had text
all over the place with few lines ever looking
good. The bad lines were hard to interpret.


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