Messages in this thread | | | Subject | Re: [PATCH] acpi, spcr: Make SPCR available to x86 | From | Prarit Bhargava <> | Date | Mon, 12 Feb 2018 08:47:57 -0500 |
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On 02/12/2018 08:34 AM, Peter Zijlstra wrote: > On Thu, Jan 18, 2018 at 10:09:51AM -0500, Prarit Bhargava wrote: >> config ACPI_SPCR_TABLE >> + bool "ACPI Serial Port Console Redirection Support" >> + default y if X86 >> + help >> + Enable support for Serial Port Console Redirection (SPCR) Table. >> + This table provides information about the configuration of the >> + earlycon console. > > I just got asked this by oldconfig, which left me rather puzzled, WTF > does this do?
Odd -- I thought I had taken care of that :( My apologies Peter.
ACPI SPCR is used by a vendor to define the serial console for a system. If SPCR exists a user can add kernel parameter "earlycon" (no extra kernel parameters) and the console will work out-of-the-box.
The serial console configuration varies from vendor to vendor. This takes the guess-work out of defining a serial console.
P.
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