Re: serial problems with grub-0.90

[Christoph Plattner]

Hello !

For the thig you want to do, you have to add the two lines to your
`menu.lst'
file:

        serial --unit=0 --speed=9600
        terminal --timeout=0 serial

The the menu starts in the serial mode with the menu, and if you enter
'c',
then also the command interpreter are running serial.

In the GRUB shell you debugged (as far I have seen), this option does
not make
sense here, except for testing the stuff. The GRUB shell always use the
tty (pty)
you use via console or telnet or xterm or whatever.

So simple add the 2 lines at the beginning of the menu file, and simply
reboot the
machine (no GRUB reinstallation necessary). Now you can use GRUB serial.

If you run your terminal program on the other box from Xterm or linux
terminal,
everything works fine.If you use special thinks (like running the
terminal 
emulation in emacs, etc...) you may also need the `--dumb' in the
`terminal' line.

With friendly regards
        Christoph P.



Pragnesh Sampat wrote:
> 
> I am using redhat 7.1 (with a newer kernel) on an x86-pc.  Installed
> grub in linux partition /boot/grub/*.  The menu.lst is also in the
> same directory.  I was able to boot using this config.
> 
> This machine does not have a console.  It has one serial port
> ttyS0/COM1 which is connected to another x86 linux box with a serial
> cable.  I was passing "console=XXX" options to lilo which I did with
> GRUB and I am at least where I was with the lilo config.  I can see
> the boot messages starting with the "Linux version 2.4.7 ..." etc. and
> get a login shell on the. serial line, just like lilo.  So far, so
> good.
> 
> Can I get the grub menu and boot options in my serial terminal?  I
> tried:
> 
>     GRUB  version 0.90  (640K lower / 3072K upper memory)
> 
>  [ Minimal BASH-like line editing is supported.  For the first word, TAB
>    lists possible command completions.  Anywhere else TAB lists the possible
>    completions of a device/filename. ]
> 
> grub> serial --unit=0 --speed=9600
> 
> Error 30: Invalid argument
> 
> grub> terminal serial Segmentation fault (core dumped)
> 
> % gdb grub core
> GNU gdb 5.0rh-5 Red Hat Linux 7.1
> Copyright 2001 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-redhat-linux"...
> Core was generated by `grub'.
> Program terminated with signal 11, Segmentation fault.
> Reading symbols from /usr/lib/libncurses.so.5...done.
> Loaded symbols for /usr/lib/libncurses.so.5
> Reading symbols from /lib/i686/libc.so.6...done.
> Loaded symbols for /lib/i686/libc.so.6
> Reading symbols from /lib/ld-linux.so.2...done.
> Loaded symbols for /lib/ld-linux.so.2
> #0  0x0804a2a0 in serial_checkkey () at asmstub.c:961
> 961       FD_SET (serial_fd, &fds);
> (gdb) where
> #0  0x0804a2a0 in serial_checkkey () at asmstub.c:961
> #1  0x08056c7f in terminal_func (arg=0x401abc5d "serial", flags=1) at 
> builtins.c:3950
> #2  0x0805763d in enter_cmdline (heap=0x401abc54 "terminal serial", 
> forever=1) at cmdline.c:168
> #3  0x0805328a in cmain () at stage2.c:1046
> #4  0x0804a8f5 in init_bios_info () at common.c:345
> #5  0x0804972e in doit.2 () at asmstub.c:123
> #6  0x08049923 in grub_stage2 () at asmstub.c:179
> #7  0x080496e3 in main (argc=1, argv=0xbffffa94) at main.c:238
> #8  0x40081177 in __libc_start_main (main=0x80494be <main>, argc=1, 
> ubp_av=0xbffffa94,
>     init=0x8048f24 <_init>, fini=0x8059650 <_fini>, rtld_fini=0x4000e184 
> <_dl_fini>,
>     stack_end=0xbffffa8c) at ../sysdeps/generic/libc-start.c:129
> (gdb)
> 
> Is this supposed to work?  Should I be able to get the grub shell on
> my serial connection?  I have not passed any arguments (like
> --disable-serial) to the configure script when running it (i. e., just
> ran "./configure").
> 
> Thanks,
> 
> -Pragnesh
> 
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