On 04/03/2015 08:52 PM, Yinghai Lu wrote: > On Fri, Apr 3, 2015 at 11:27 AM, Peter Hurley <pe...@hurleysoftware.com> > wrote: >> On 04/03/2015 01:44 PM, Yinghai Lu wrote: >>> On Fri, Apr 3, 2015 at 10:38 AM, Peter Hurley <pe...@hurleysoftware.com> >>> wrote: >>>> On 04/03/2015 12:57 PM, Yinghai Lu wrote: >>>> >>>> Wait -- you have earlycon in a product?? >>> >>> What do you mean? >> >> I mean, what will happen if I put in a big debug banner like Steven >> did for ftrace? >> >> Kernel developers need earlycon for debugging arch code; often the earlycon >> is just hacked together especially when it requires fixmap support. >> >> Putting it in a product and _relying on undocumented behavior_ is a bad idea. > > let me repeat again: > when you have "console=uart8250,io,0x3f8", you will have earlycon and > then console. > > That is just for kernel developer for debugging. > > When you have x86 with bunch of dimms and cpus, user will have to wait couple > of minutes to output from console=ttyS0....and if it hang early, no > one would know what happen. > > Also it is only boot time only....
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