[Bug 234055] PL011 UART driver unable to change baudrate when booted via u-boot

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234055

            Bug ID: 234055
           Summary: PL011 UART driver unable to change baudrate when
                    booted via u-boot
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: sjorge+signup at blackdot.be

After a long few months trying to figure this out...

It looks like the PL011 UART driver is unable to set a baudrate when booted via
u-boot. My understanding of the code is poor but it looks like it only works
for x86 BIOS/EFI booted systems.

This seems like something that might be useful for people running HAT's on
raspberry pi's or other ARM boards.

Currently the baudrate can be set using u-boot by adding

init_baudrate="9600" to /boot/msdos/config.txt but it FreeBSD is unable to
change it. 

It would be nice to have baudrate setting implemented eventually... but at
least now there is a ticket for other people having this problem.

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