On Wed, Mar 14, 2018 at 6:29 PM, Daniel Kurtz <[email protected]> wrote: > On Wed, Mar 14, 2018 at 4:54 AM Ricardo Ribalda Delgado < > [email protected]> wrote: >> On Wed, Mar 14, 2018 at 1:36 AM, Daniel Kurtz <[email protected]> > wrote:
> In fact, the recommended way is to have firmware specify an ACPI SPCR table > with OEMID="AMDCZ " (see https://patchwork.kernel.org/patch/10281307/) to > configure proper access and address. Hmm... I was thinking it's already there. And thus, this is just a quirk for *existing* firmware that doesn't correctly configured hardware. (Yes, I'm aware about one nuance in SPCR specification I'm trying to address via official ways) > With an SPCR table in place, the > kernel command line just becomes "earlycon", with no parameters. SPCR *provides* an address of UART (required by specification). -- With Best Regards, Andy Shevchenko
