From: arnd@arndb•de (Arnd Bergmann)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 0/8] Generic serial earlycon
Date: Sat, 22 Mar 2014 10:54:39 +0100 [thread overview]
Message-ID: <201403221054.39799.arnd@arndb.de> (raw)
In-Reply-To: <1395436128-11244-1-git-send-email-robherring2@gmail.com>
On Friday 21 March 2014, Rob Herring wrote:
> From: Rob Herring <robh@kernel•org>
>
> This started out as an attempt to add arm64's earlyprintk support to ARM
> in order to get an earlier, runtime setup console on multi-platform
> kernels. The first issue was needing the fixmap support which
> conveniently Mark Salter was working on and is mostly in place now. Like
> many things on ARM and arm64 now, it then became where do I put the now
> common, shared code. After digging more into various early console/printk
> support, it turns out the 8250_early.c setup code was the best starting
> point.
>
> This is based on Mark Salter's fixmap support currently in linux-next.
> This is tested on arm64 and ARM with pl011 and 8250. The ARM support
> also requires fixmap and fixed mapping support which are not yet in place.
> I have some patches in my tree to support fixmap, but they need some more
> work. Fortunately, once fixmap is in place, it is just a Kconfig option
> to enable earlycon support on ARM. A git tree is available here[1].
>
> Based on this series, I would like to add support for doing earlycon
> setup using DT.
Hi Rob,
I like this series a lot, great work!
I would consider the DT parsing support essential here, we should not
merge the patches until that is done as well, because I don't want
to see users pass earlycon command line options in DT when they can
use the established "linux,stdout-path" property instead. I would
expect that in almost every case in which we are booting using DT
today, we can just use linux,stdout-path to locate the device that
the boot loader has already set up and start usign it.
Arnd
next prev parent reply other threads:[~2014-03-22 9:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-21 21:08 [PATCH 0/8] Generic serial earlycon Rob Herring
[not found] ` < 201403221054.39799.arnd@arndb.de>
[not found] ` < CAL_JsqKjGjyYypwneCmNc1qeKe0ZOG9gz3QSJ37-HwHXKu3iRA@mail.gmail.com>
[not found] ` < 20140329001732.BECE2C41FF4@trevor.secretlab.ca>
2014-03-21 21:08 ` [PATCH 1/8] x86: move FIX_EARLYCON_MEM kconfig into x86 Rob Herring
2014-03-21 21:08 ` [PATCH 2/8] arm64: add FIXMAP_PAGE_NOCACHE definition Rob Herring
2014-03-24 11:13 ` Catalin Marinas
2014-03-21 21:08 ` [PATCH 3/8] arm64: enable FIX_EARLYCON_MEM kconfig Rob Herring
2014-03-24 11:38 ` Catalin Marinas
2014-03-21 21:08 ` [PATCH 4/8] tty/serial: add generic serial earlycon Rob Herring
2014-03-24 11:22 ` Catalin Marinas
2014-03-24 11:29 ` Arnd Bergmann
2014-03-24 13:36 ` Rob Herring
2014-03-24 15:42 ` Arnd Bergmann
2014-04-17 18:27 ` Rob Herring
2014-04-17 20:16 ` Alan Cox
2014-04-19 11:32 ` Arnd Bergmann
2014-03-21 21:08 ` [PATCH 5/8] tty/serial: convert 8250 to generic earlycon Rob Herring
2014-03-21 21:08 ` [PATCH 6/8] tty/serial: pl011: add generic earlycon support Rob Herring
2014-03-24 11:28 ` Catalin Marinas
2014-04-16 22:14 ` Rob Herring
2014-04-23 16:39 ` Catalin Marinas
2014-03-21 21:08 ` [PATCH 7/8] tty/serial: add arm64 semihosting earlycon Rob Herring
2014-03-23 20:04 ` Nicolas Pitre
2014-03-23 20:23 ` Arnd Bergmann
2014-03-23 21:48 ` Nicolas Pitre
2014-03-24 11:38 ` Catalin Marinas
2014-03-24 11:48 ` Catalin Marinas
2014-03-21 21:08 ` [PATCH 8/8] arm64: remove arch specific earlyprintk Rob Herring
2014-03-22 9:54 ` Arnd Bergmann [this message]
2014-03-22 14:14 ` [PATCH 0/8] Generic serial earlycon Rob Herring
2014-03-22 22:01 ` Arnd Bergmann
2014-03-23 15:09 ` Rob Herring
2014-03-23 19:49 ` Arnd Bergmann
2014-03-29 0:17 ` Grant Likely
2014-03-29 14:33 ` Rob Herring
2014-03-29 15:34 ` Grant Likely
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