On 04/03/2015 01:44 PM, Yinghai Lu wrote: > On Fri, Apr 3, 2015 at 10:38 AM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> 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. > when you are using "console=uart8250,io,0x3f8" > you will have earlycon at first, and handover to console. which means you have to have CONFIG_SERIAL_EARLYCON to get a serial console at all. I have no problem fixing this _if this is causing actual regressions_, and not simply some minor inconvenience that can be fixed by editing your grub command line. However, I see this undocumented behavior as a cautionary tale for why not every kernel command line hack should be accepted in mainline. Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
