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Subject: Re: Odd-looking serial console prompt on RPI2
From: Andrew Turner <andrew@fubar.geek.nz>
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Date: Wed, 8 Mar 2017 18:23:28 +0900
Cc: "Jayachandran C." <jchandra@freebsd.org>,
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 Michael Tuexen <tuexen@fh-muenster.de>
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To: Ian Lepore <ian@freebsd.org>
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> On 8 Mar 2017, at 10:35, Ian Lepore <ian@freebsd.org> wrote:
> 
> On Wed, 2017-03-08 at 03:18 +0530, Jayachandran C. wrote:
>> On Mon, Mar 6, 2017 at 9:54 PM, Ian Lepore <ian@freebsd.org> wrote:
>>> [...]
>> 
>> I was thinking that IFLS behaved differently on ThunderX and that is
>> why my original code worked there. But after going thru the spec
>> again,
>> it looks like the FIFO in newer pl011 implementations is 32 entry
>> deep,
>> and that may be real reason why ThunderX did not have any issues.
>> 
>> JC.
> 
> Could you (and anybody else who has a board that uses pl011 uarts)
> please test the attached patch?  I tested already on an rpi-b and it
> works fine there, but I'd like to hear whether it works on something
> that actually has 32-byte fifos.  It should probably be tested on an
> rpi2 as well (which I don't have).

It works for me on ThunderX.

Andrew