1 |
After finding some docs for the values allowed in /etc/default/grub in the |
2 |
Grub2 docs here: |
3 |
|
4 |
http://www.gnu.org/software/grub/manual/grub.html#Simple-configuration |
5 |
|
6 |
|
7 |
|
8 |
I've found what I believe are the answers to my questions. The following |
9 |
values need to be added to /etc/default/grub: |
10 |
|
11 |
GRUB_TERMINAL="console serial" |
12 |
|
13 |
This is a shortcut for setting input and output separately since they both |
14 |
need to be set to console and serial. |
15 |
|
16 |
GRUB_SERIAL_COMMAND="serial --speed=115200 --word=8 --parity=no --stop=1 |
17 |
usb1" |
18 |
|
19 |
The usb1 should be substituted for your USB port. This doesn't seem to meet |
20 |
the syntax for the serial command described in the Grub2 docs; the usb1 on |
21 |
the end of the line isn't listed. I'm pulling this from the link below and |
22 |
don't know if it'll actually work. |
23 |
|
24 |
GRUB_PRELOAD_MODULES="several_modules_go_here" |
25 |
|
26 |
|
27 |
|
28 |
The list of possible modules and the process for identifying the USB port |
29 |
can be found in section 3.1.2 of this documentation: |
30 |
|
31 |
http://www.coreboot.org/GRUB2 |
32 |
|
33 |
|
34 |
|
35 |
I still need to get sighted assistance to identify the USB port but suspect |
36 |
this will work. If anyone has successfully made this change to |
37 |
/etc/default/grub, I'd love to hear from you. |
38 |
|
39 |
|
40 |
|
41 |
Keith |
42 |
|
43 |
|
44 |
|
45 |
From: Keith Wessel [mailto:kwessel76@×××××.com] On Behalf Of Keith Wessel |
46 |
Sent: Thursday, April 02, 2015 4:30 PM |
47 |
To: gentoo-accessibility@l.g.o |
48 |
Subject: Grub2 and serial consoles |
49 |
|
50 |
|
51 |
|
52 |
Hi, |
53 |
|
54 |
|
55 |
|
56 |
Wondering if there's a way to have grub2-mkconfig include the lines needed |
57 |
to enable a serial console in my grub.cfg. Can I add them to |
58 |
/etc/grub.d/40_custom, or does that come too late in the file? I'd rather |
59 |
not go hacking the headers include if I don't have to, unless that's the |
60 |
right thing to do and Portage will be nice enough to not overwrite it |
61 |
without first asking me. |
62 |
|
63 |
|
64 |
|
65 |
I finally got around to upgrading to grub2! It went very smoothly. Since |
66 |
grub2-mkconfig is available, I saw no reason to do a manual configuration. I |
67 |
might have just found one, though. |
68 |
|
69 |
|
70 |
|
71 |
I have a USB to serial adapter which I've been using as a great way to |
72 |
handle emergencies when the system won't boot. I couldn't ever find a way to |
73 |
get it working with legacy Grub, but it looks like, once I can identify the |
74 |
USB port it's using, it's a matter of loading a couple more modules and |
75 |
adding it to my terminal_input and terminal_output lines. |
76 |
|
77 |
|
78 |
|
79 |
Qustion: can I add it to the 40_custom, 00_header, or something similar? Or |
80 |
will I need to start maintaining my own grub.cfg? |
81 |
|
82 |
|
83 |
|
84 |
Thanks, |
85 |
|
86 |
Keith |