linux-kernel - Re: [tip:x86/mm] x86/boot/32: Defer resyncing initial_page

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Message-ID: <7bc13fad-ef45-03e3-ad43-7bca3fdf7f21@siemens.com>
Date:   Mon, 8 May 2017 17:24:58 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        x86 <x86@...nel.org>, linux-efi <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Brian Gerst <brgerst@...il.com>,
        Thomas Garnier <thgarnie@...gle.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [tip:x86/mm] x86/boot/32: Defer resyncing initial_page_table
 until per-cpu is set up

On 2017-05-08 16:45, Andy Shevchenko wrote:
> On Mon, May 8, 2017 at 3:34 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
>> On 2017-05-08 13:21, Andy Lutomirski wrote:
> 
>> Yes, it's an EFI thing. Unfortunately, I didn't make
>> earlycon/earlyprintk work yet.
> 
> Quark does use HS UART for the console and we have no support for such
> in x86/earlyprintk. earlycon should work if you add proper parameters
> to the command line (including port base address, no ttySx), though I
> don't remember if it makes really "early".

Ah, that explains it. I've tried earlycon, also with the apparently
correct params, but it didn't print anything in this case. And
earlyprintk=efi seems to use a framebuffer, while our devices are
headless...

Jan

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