On Thu, Mar 28, 2019 at 02:03:17PM +0100, Borislav Petkov wrote: > On Tue, Mar 19, 2019 at 09:43:25PM +0300, Andy Shevchenko wrote: > > If by BIOS or by other means the serial port is configured > > user might want to skip reconfiguration in the boot code. > > That needs more explanation: how can that happen?
I didn't get what is 'that' here? You mean that serial interface becomes configured before kernel even starts? See below. > How is the user > supposed to know whether the serial port is configured in order to use > this cmdline param? If the connection to the target is done via serial interface and firmware and / or bootloader already did necessary configuration. > Why can't the kernel detect whether the serial port is configured and > not touch that configuration? Because it can't at this stage. We simple can't afford to move all serial drivers (even partially) to the _boot_ part of the kernel. > A lot of why's and head scratching... What other why's should be answered? -- With Best Regards, Andy Shevchenko
