On 19 May 2018 at 00:32, Petter Gustad <g...@gustad.com> wrote: > 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: >>> >> >> .... >> 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.
I think GRUB relies on the BIOS/UEIF to provide drivers and typically USB was only used to emulated old hardware like keyboard/mouse and CD-ROMs. Coreboot - is a BIOS/UEIF replacement and so it can do anything they care to implement - but then it has to be customised for each individual hardware case where as GRUB can rely on the standardised routines. But perhaps things have moved on - it would be great if UEIF provided some standard USB drivers for serial. Andrew _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
