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SubjectRe: [PATCH] serial: 8250: Default SERIAL_OF_PLATFORM to SERIAL_8250

On November 14, 2018 5:11:25 PM PST, Guenter Roeck <> wrote:
>On Thu, Nov 01, 2018 at 11:26:06AM -0700, Florian Fainelli wrote:
>> It is way too easy to miss enabling SERIAL_OF_PLATFORM which would
>> result in the inability for the kernel to have a valid console
>> which can be seen with:
>> Warning: unable to open an initial console.
>> and then:
>> Run /init as init process
>> Kernel panic - not syncing: Attempted to kill init!
>> Since SERIAL_OF_PLATFORM already depends on SERIAL_8250 && OF there
>> really is no drawback to defaulting this config to the value of
>> SERIAL_8250.
>> Signed-off-by: Florian Fainelli <>
>> Signed-off-by: Greg Kroah-Hartman <>
>This patch results in situations where CONFIG_SERIAL_OF_PLATFORM is now
>defined where it was not previously. Example mpc85xx_defconfig. This in
>turn results in boot failures for those configurations, with an error
>message of
>of_serial: probe of e0004500.serial failed with error -22
>which wasn't seen before.

Do you know which Device Tree is being used here? The most obvious thing that could be done is to add a !PPC condition but this might be missing other platforms doing their own 8250 registration yet being OF aware (sparc?).

>Not sure if replacing a potential problem with a real one is really an

That comment is not particularly helpful though I have an appreciation for when a change breaks things in unexpected ways and how frustrating that can be.

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