From: Julien Grall <julien.grall@arm.com>
To: Amit Tomer <amittomer25@gmail.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
wei.liu2@citrix.com, konrad.wilk@oracle.com,
George Dunlap <George.Dunlap@eu.citrix.com>,
ian.jackson@eu.citrix.com, tim@xen.org,
Andrew Cooper <andrew.cooper3@citrix.com>,
Jan Beulich <jbeulich@suse.com>,
Andre Przywara <andre.przywara@arm.com>,
xen-devel@lists.xenproject.org
Subject: Re: [RFC PATCH 1/2] xen/arm: Add Amlogic S905 SoC early printk support
Date: Wed, 12 Sep 2018 10:12:06 +0100 [thread overview]
Message-ID: <c16a9f12-2a1e-0124-a282-d2874aaf4e8e@arm.com> (raw)
In-Reply-To: <CABHD4K9T94iVVZHWPZaMEmNmhidQsGgpsJxd0W3c6+jpph+HuA@mail.gmail.com>
On 09/12/2018 07:43 AM, Amit Tomer wrote:
> Hello,
>
>> I am trying to understand why Linux is doing it. Do you expect all
>> U-Boot version to do it?
>
> It's because Linux doesn't really trust u-boot and initializes every
> thing again ?
You don't know the state of the UART once you left U-boot. For
earlyprintk this may not be a big deal (they are for debugging only).
> Mainline U-boot does it but that may also not required since ATF does it for us.
What I wanted to check is whether there are U-boot out configuring
"incorrectly" the UART for earlyprintk. But I guess we can leave that
aside for now.
Cheers,
--
Julien Grall
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next prev parent reply other threads:[~2018-09-12 9:12 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-07 17:07 [RFC PATCH 0/2] xen/arm64: Add Support for Amlogic S905 SoC Amit Singh Tomar
2018-08-07 17:07 ` [RFC PATCH 1/2] xen/arm: Add Amlogic S905 SoC early printk support Amit Singh Tomar
2018-08-14 10:01 ` Julien Grall
2018-08-20 9:16 ` Amit Tomer
2018-08-22 9:52 ` Julien Grall
2018-09-12 6:43 ` Amit Tomer
2018-09-12 9:12 ` Julien Grall [this message]
2018-10-22 23:31 ` André Przywara
2018-11-17 8:47 ` Amit Tomer
2018-08-07 17:07 ` [RFC PATCH 2/2] xen/arm: Add MESON UART driver for Amlogic S905 SoC Amit Singh Tomar
2018-08-08 10:05 ` Jan Beulich
2018-08-14 10:17 ` Julien Grall
2018-08-20 8:12 ` Amit Tomer
2018-08-22 10:00 ` Julien Grall
2018-10-04 7:11 ` Amit Tomer
2018-10-09 10:25 ` Julien Grall
2018-10-22 23:31 ` André Przywara
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