[lkml]   [2018]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 1/3] serial: 8250_early: Add earlycon support for AMD Carrizo / Stoneyridge
On Wed, Mar 14, 2018 at 6:29 PM, Daniel Kurtz <> wrote:
> On Wed, Mar 14, 2018 at 4:54 AM Ricardo Ribalda Delgado <
>> wrote:
>> On Wed, Mar 14, 2018 at 1:36 AM, Daniel Kurtz <>
> wrote:

> In fact, the recommended way is to have firmware specify an ACPI SPCR table
> with OEMID="AMDCZ " (see 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
(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

 \ /
  Last update: 2018-03-14 17:38    [W:0.067 / U:0.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site