[Bug 234055] PL011 UART driver unable to change baudrate when booted via u-boot
bugzilla-noreply at freebsd.org
bugzilla-noreply at freebsd.org
Sun Dec 16 12:17:55 UTC 2018
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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