Messages in this thread | | | Date | Thu, 28 Mar 2019 16:27:56 +0200 | From | Andy Shevchenko <> | Subject | Re: [PATCH v2 7/7] x86/boot: Support nocfg parameter for earlyprintk |
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On Thu, Mar 28, 2019 at 03:13:07PM +0100, Borislav Petkov wrote: > On Thu, Mar 28, 2019 at 04:00:39PM +0200, Andy Shevchenko wrote: > > If it's _non-standard_ serial interface (by meaning of I/O accessors and port > > addresses), user may consider to use this options in case the interface to > > communicate with kernel is serial one and its configuration is done by other > > means (firmware / bootloader / EFI / etc). > > And is this non-standard interface out there in the wild or only at > Intel's labs?
Of course in the wild.
> Are there boxes like that out there?
One at hand now is called Intel Edison.
> If I go to the store and buy a box, how do I know whether that box would > need "nocfg"? Do I look in the BIOS or how do I find out I need to supply > "nocfg"?
By reading some technical documentation I suppose. What is your point here? earlyprintk is a mechanism for _debugging_, I suppose the user should have slightly more knowledge than user.
> > If by BIOS or by other means the serial port is configured > > How do I find out that the serial port is configured?
If you _already_ connected via it and get firmware / bootloader messages.
-- With Best Regards, Andy Shevchenko
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