Hi,
On 16-03-15 19:23, Peter Hurley wrote:
On 03/16/2015 02:12 PM, Hans de Goede wrote:
Hi,
On 16-03-15 18:49, Peter Hurley wrote:
Hi Hans,
On 03/16/2015 12:31 PM, Hans de Goede wrote:
Hi All,
While updating my local working tree to 4.0-rc4 this morning I noticed that I no longer
get console / kernel messages output on the hdmi output of my ARM board / on tty0
This is caused by:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/of?id=2fa645cb2703d9b3786d850db815414dfeefa51d
Reverting this commit fixes this for me.
What is happening here is that the "add_preferred_console("stdout-path", 0, NULL);"
happens before the tty0 registers stopping tty0 from becoming part of the console list
since there already is a preferred console at that time.
This is an undesirable behavior change caused by the commit in question, on boards
where there is both video output, and a serial console configured through stdout-path
we want to have console output on both as we do not know which of the 2 will actually
be hooked up by the user.
I don't see this as a regression, but rather a misconfiguration.
As said it is an undesirable behavior change, whether you want to call that a regression
or not is not all that interesting. Fixing it however is important, as e.g. Fedora
ARM images rely on this behavior, both "regular" arm as well as aarch64.
What dts file is causing this problem?
Is it in mainline or distributed only in Fedora?
This is on allwinner (sunxi) devices such as Allwinner A10 or A20 based boards, currently
the setting of stdout-path on these boards is done by (an unmodified) upstream u-boot.
To be clear about my aarch64 remark, that relates to the behavior of aarch64 acpi using
machines, those will also output to both a serial tty and tty0 when the acpi equivalent
of stdout-path is present and points to a serial tty.
Regards,
Hans
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