Comment 2 for bug 1689818

On Wed, May 10, 2017 at 8:42 AM, Timur Tabi <email address hidden>
wrote:
> You need these patches:
>
> tty: pl011: Work around QDF2400 E44 stuck BUSY bit (4.10)
> tty: acpi/spcr: QDF2400 E44 checks for wrong OEM revision (4.11)
> tty: pl011: fix earlycon work-around for QDF2400 erratum 44 (4.11)

These are in linus's tree or linux-next
>
> tty: pl011: use "qdf2400_e44" as the earlycon name for QDF2400 E44
> (4.12)

But this one is not in linux-next yet.

> and then it's one of these two:
>
> earlycon=qdf2400_e44,0xff78ed1000 (UART)
> earlycon=qdf2400_e44,0xff78ef1000 (SOL)
>
> Or you can just do "earlycon" without anything after that, but that
> triggers after the ACPI tables have been parsed.
>
> From: Manoj Iyer <email address hidden>
> Date: Wednesday, May 10, 2017 at 8:30 AM
> To: Timur Tabi <email address hidden>
> Subject: What is the command to enable earlycon?
>
> Timur,
>
> What is the kernel parameter to enable earlycon? I know it changed
> for AW and we have never used it . I need it to test
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1689818
>
> Thanks
> Manoj Iyer