Re: FTDI serial console support?

[Petter Gustad <grub@gustad.com>]

From: Daniel Kiper <dkiper@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 <dkiper@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.

Best regards
//Petter