Emmanuel Dreyfus <m...@netbsd.org> wrote: > On Fri, May 16, 2025 at 07:39:31AM +0000, Emmanuel Dreyfus wrote: >> I have a Dell server with no serial port, and a serial console is highly >> desirable for system administration. I wonder if EFI bootstrap could >> be modified to use a serial port from a PCIe to serial card, or from a >> USB to serial adapter. > > Replying to myself to tell some succes. > > The UEFI bootstrap uses UEFI for serial I/O, hence we need UEFI to > have a driver for the serial port in order to use it in NetBSD EFI > bootstrap.
[snip] > This is great, but the next step is booting the kernel. It does not > support the console on the USB-to-serial adapter and I boot to > multiuser without a console. > > Hence the new question is: do we have any hope of using a USB-to-serial > adapter for kernel console? I have not looked at it yet, but I understand > there will be the issue that the USB-to-serial adapter cannot work > before a lot of devices initialization. It would be nice to have it > working for single-user mode, and that should be possible. Do you want this to work before interrupts are enabled as well as after?
