From: Daniel Kiper <dki...@net-space.pl> Subject: Re: FTDI serial console support? Date: Fri, 18 May 2018 13:55:55 +0200
> On Fri, May 18, 2018 at 01:01:41PM +0200, Petter Gustad wrote: >> From: Daniel Kiper <dki...@net-space.pl> >> Subject: Re: FTDI serial console support? >> Date: Wed, 16 May 2018 11:32:19 +0200 >> >> > 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. >> >> Thank you for the link. >> >> Unfortunately, it seems like my system can't access the hard disk >> after running "insmod ehci" despite doing "insmod nativedisk" first. >> Some of subsequent insmod commands will fail when accessing the disk >> and I'm not able to boot linux either. > > Could you just do "insmod usbserial_ftdi"? There is a chance that it > will pull in all needed dependencies without breaking disk access. Thanks. Only "insmod usbserial_ftdi" does work in the sense that it will not break disk access. I also managed to load grub using PXE/tftp where I was not dependend upon disk access. But in both cases it does not work like in the coreboot URL above. After do insmod on usbserial_ftdi and usbserial_usbdebug the terminal_output command will only return console as its active output terminal. It will list serial_* as available output terminals, but I can't select usb0, usb1, etc as argument to the serial command. Best regards //Petter _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
