linux-kernel - Re: [PATCH v2] x86: Early-boot serial I/O support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <AANLkTinoUx_1NaBYtmSJ8Hdt5KyWAV-yLzwSX7ajqp9P@mail.gmail.com>
Date:	Sun, 11 Jul 2010 00:32:06 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Cyrill Gorcunov <gorcunov@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2] x86: Early-boot serial I/O support

On Sun, Jul 11, 2010 at 12:27 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 07/10/2010 02:17 PM, Pekka Enberg wrote:
>> On Sat, Jul 10, 2010 at 11:49 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>> can you analyze "console=uart8250,io,0x3f8,115200n8" instead?
>>>
>>> that is equal to "earlyprintk=ttyS0,115200 console=ttyS0,115200"
>>>
>>> so we only use one for all.
>>>
>>> also like to kill earlyprintk=ttyS0,115200 to favor earlycon
>>
>> hpa, what's your take on this?
>>
>> The 'console' variant seems overly complicated to me. We can add it
>> but we also need to check for 'earlyprintk' as long as it's supported
>> by the kernel.
>>
>
> earlyprintk= seems to be preferred over console= these days.  Quite
> frankly it's idiotic to have the user enter as many low-level details as
> one has to do for the console= one.
>
> Now, as for the I/O base, the I/O base for legacy serial ports are
> available from a 4-element u16 array starting at absolute address 0x400.
>  I don't think Linux currently examines that array -- instead relying on
> the hard-coded values 0x3f8, 0x2f8, 0x3e8, 0x2e8 -- but it might
> something to consider for the future.  However, we should match the
> serial port subsystem there, of course.

OK. The current patch should match 'earlyprintk' handling which uses
hard-coded values only.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/