Re: [PATCH v3] console: use first console if stdout-path device doesn't appear
From: Andreas Schwab <hidden>
Date: 2016-11-04 08:05:57
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Possibly related (same subject, not in this thread)
- 2016-11-07 · Re: [PATCH v3] console: use first console if stdout-path device doesn't appear · Larry Finger <hidden>
- 2016-11-07 · Re: [PATCH v3] console: use first console if stdout-path device doesn't appear · Paul Burton <hidden>
- 2016-11-07 · Re: [PATCH v3] console: use first console if stdout-path device doesn't appear · Larry Finger <hidden>
- 2016-11-07 · Re: [PATCH v3] console: use first console if stdout-path device doesn't appear · Paul Burton <hidden>
- 2016-11-07 · Re: [PATCH v3] console: use first console if stdout-path device doesn't appear · Michael Ellerman <mpe@ellerman.id.au>
On Nov 03 2016, Paul Burton [off-list ref] wrote:
If a device tree specified a preferred device for kernel console output
via the stdout-path or linux,stdout-path chosen node properties there's
no guarantee that it will have specified a device for which we have a
driver. It may also be the case that we do have a driver but it doesn't
call of_console_check() to register as a preferred console (eg. offb
driver as used on powermac systems).
In these cases try to ensure that we provide some console output by
enabling the first usable registered console, which we keep track of
with the of_fallback_console variable. Affected systems will enable
their console later than they did prior to commit 05fd007e4629
("console: don't prefer first registered if DT specifies stdout-path")
but should otherwise produce the same output.
Tested in QEMU with a PowerPC pseries_defconfig kernel.Unfortunately, that still doesn't work on PowerMac. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."