Re: [meta-rockchip][PATCH] Fix Rock Pi 4 serial port

["Trevor Woerner" <twoerner@gmail.com>]

On Fri 2020-12-11 @ 08:47:52 AM, Joshua Watt wrote:
> Fixes the serial port output stopping mid way through the boot process
> by reverting the kernel commit that caused it.

Interesting.

As you know (but for reference for other people) the baud rate of the rock pi
4's serial console is 1,500,000bps and not the usual 115,200bps that
everything else uses.

I have *always* seen instability on the console. The best way to reproduce
this instability is with the following test:

	root@rock-pi-4:~# cd /
	root@rock-pi-4:/# ls -lR

This never lasts more than a second or two before freezing up.

The ironic thing is, before applying this patch I thought I'd give the latest
of everything a test (I don't test every change every day on my board).

With all the latest software but before applying your patch, I just went
through 5 cycles of:
	- reboot
	- ls -lR

I didn't see a single freeze-up on the console! I've never seen the console
survive the ls -lR thing, nevermind 5 in a row.

Weird.

I did, however, recently change the device I'm using to supply my USB-C power.
I had noticed my last power supply was flaky, my local computer shop had some
new fandangled ones on sale, so I upgraded.

In any case I'm happy to apply the patch, if it solves a problem for you then
others are likely to bump into it as well. But interesting nonetheless.

Best regards,
	Trevor