On Wed, May 16, 2018 at 06:21:17AM +0200, Petter Gustad wrote: > From: Daniel Kiper <dki...@net-space.pl> > Subject: Re: FTDI serial console support? > Date: Tue, 15 May 2018 22:00:06 +0200 > > > On Fri, May 11, 2018 at 03:55:36PM +0200, Petter Gustad wrote: > >> > >> Is there a way to specify a FTDI based serial console using > >> GRUB_TERMINAL, GRUB_SERIAL_COMMAND, or some other variable? If yes, > >> what is the syntax? > >> > >> BTW my serial port adapter matches the vendor id and device id given > >> in grub-core/bus/usb/serial/ftdi.c: > >> > >> Bus 001 Device 008: ID 0403:6001 Future Technology Devices International, > >> Ltd FT232 Serial (UART) IC > > > > Have you tried usbserial_ftdi, e.g. GRUB_TERMINAL=usbserial_ftdi? > > Just guessing... > > Yes, I tried (as I found the "usbserial_ftdi" string in the source) > the but grub-mkconfig does not accecpt it: > > grub-mkconfig -o /boot/grub/grub.cfg > Invalid output terminal "usbserial_ftdi" > > Currently I have this: > > GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyUSB0,115200n8" > #GRUB_TERMINAL="console serial" > GRUB_TERMINAL="serial" > GRUB_SERIAL_COMMAND="usbserial_ftdi --speed=115200 --unit=0 --word=8 > --parity=no --stop=1" > > But this does not seem to work either, even though I do get console > output on my USB serial after the kernel has loaded (due to > GRUB_CMDLINE_LINUX being passed to the kernel), e.g. I can do "echo > hello > /dev/console" and read "hello" on the USB serial output. When > I do a "reboot" I observe messages about unmounting filesystems etc. > > I was hoping to be able to select kernels and options in grub using > the USB serial line.
Please take a look here: https://www.coreboot.org/GRUB2#On_a_USB_serial_or_USB_debug_adapter I hope that helps. Daniel _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
