Serial Console Support in Kernel

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Serial Console Support in Kernel

by Ingo Juergensmann-4 :: Rate this Message:

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Hi Christian,

when I configured Elgar lately for the data center, I realized that the
Debian kernel was without serial console support. I believe it would be nice
to have this enabled by default, so could you please do so? TIA! :)

BTW: Elgar dropped off the net and needs a caring hand. I don't know when
the people at NMMN will find some time to have a look at it, but a serial
console would surely help... ;)

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Re: Serial Console Support in Kernel

by Michael Schmitz-6 :: Rate this Message:

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Hi,

> BTW: Elgar dropped off the net and needs a caring hand. I don't know when
> the people at NMMN will find some time to have a look at it, but a serial
> console would surely help... ;)

What sort of serial console do yo need - just enough to log in after a
normal boot, for single user or for debugging the early boot stages?

  Michael


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Re: Serial Console Support in Kernel

by Ingo Juergensmann-4 :: Rate this Message:

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On Wed, Jun 11, 2008 at 05:24:04AM +0200, Michael Schmitz wrote:

>> BTW: Elgar dropped off the net and needs a caring hand. I don't know when
>> the people at NMMN will find some time to have a look at it, but a serial
>> console would surely help... ;)
> What sort of serial console do yo need - just enough to log in after a  
> normal boot, for single user or for debugging the early boot stages?

The latter... the sooner the better. :)

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Re: Serial Console Support in Kernel

by Christian T. Steigies :: Rate this Message:

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On Tue, Jun 10, 2008 at 02:44:48PM +0200, Ingo Juergensmann wrote:
> Hi Christian,
>
> when I configured Elgar lately for the data center, I realized that the
> Debian kernel was without serial console support. I believe it would be nice
> to have this enabled by default, so could you please do so? TIA! :)

Just tell me which option I need to activate, and I will try to include that
in the next images, and I can also build some test images for you.

Christian


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Re: Serial Console Support in Kernel

by Michael Schmitz-6 :: Rate this Message:

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>> Debian kernel was without serial console support. I believe it would be nice
>> to have this enabled by default, so could you please do so? TIA! :)
>
> Just tell me which option I need to activate, and I will try to include that
> in the next images, and I can also build some test images for you.

CONFIG_SERIAL_CONSOLE is the config option.

AFAICS Amiga only offers two options - debug=mem saves the dmesg buffer in
chip RAM for later reading by AmigaOS dmesg. Not too useful for us (Geert:
could we leave the corresponding chunk in chipram untouched for reading it
out using a different kernel (or different parameter, like debug=getmem ??)

debug=ser is active once consoles have been set up (and it looks like you
should be able to use it as command console as well).

HTH,

  Michael


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Re: Serial Console Support in Kernel

by Ingo Juergensmann-4 :: Rate this Message:

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On Thu, Jun 12, 2008 at 03:19:08AM +0200, Michael Schmitz wrote:

>>> Debian kernel was without serial console support. I believe it would be nice
>>> to have this enabled by default, so could you please do so? TIA! :)
>> Just tell me which option I need to activate, and I will try to include that
>> in the next images, and I can also build some test images for you.
> CONFIG_SERIAL_CONSOLE is the config option.

Yes, I think so...

> AFAICS Amiga only offers two options - debug=mem saves the dmesg buffer
> in chip RAM for later reading by AmigaOS dmesg. Not too useful for us

Indeed, especially at the moment without a suitable monitor at the data
center. I plan to get one there when I'm visiting my parents the next time.

> (Geert: could we leave the corresponding chunk in chipram untouched for
> reading it out using a different kernel (or different parameter, like
> debug=getmem ??)

Would be nice to have, yes, but it's difficult to use when there's a
non-booting kernel and you can't change the commandline remotely to boot
another kernel. ;)
A real Amiga bootloader with serial console would be really great for this!
;)

> debug=ser is active once consoles have been set up (and it looks like you
> should be able to use it as command console as well).

Well, when the consoles are up you can use the normal serial console as
well. I don't know what's the difference when you set debug=ser without
looking it up...  

Anyway, it would be nice to have a serial console (system messages during
boot) as soon as possible and we should setup at least Crest as well for
using such a serial console. Due to it's VGA output and the FlickerFixer,
Kullervo don't need this as urgent as Crest and Elgar, IMHO...

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Re: Serial Console Support in Kernel

by Geert Uytterhoeven :: Rate this Message:

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On Thu, 12 Jun 2008, Ingo Juergensmann wrote:

> On Thu, Jun 12, 2008 at 03:19:08AM +0200, Michael Schmitz wrote:
> > AFAICS Amiga only offers two options - debug=mem saves the dmesg buffer
> > in chip RAM for later reading by AmigaOS dmesg. Not too useful for us
>
> Indeed, especially at the moment without a suitable monitor at the data
> center. I plan to get one there when I'm visiting my parents the next time.
>
> > (Geert: could we leave the corresponding chunk in chipram untouched for
> > reading it out using a different kernel (or different parameter, like
> > debug=getmem ??)

Should be possible. Probably the nicest would be to copy the old data
somewhere else, and provide it to the user of the new kernel through sysfs...

> Would be nice to have, yes, but it's difficult to use when there's a
> non-booting kernel and you can't change the commandline remotely to boot
> another kernel. ;)

One of my wild plans is to get kexec working.  Then you can boot your test
kernel using kexec. If it crashes, just reboot, and the normal bootloader
boots the known-good kernel.

> A real Amiga bootloader with serial console would be really great for this!
> ;)

Hey, amiga-lilo does have serial support!

> > debug=ser is active once consoles have been set up (and it looks like you
> > should be able to use it as command console as well).
>
> Well, when the consoles are up you can use the normal serial console as
> well. I don't know what's the difference when you set debug=ser without
> looking it up...  

debug=ser also gives you kernel messages, inclusing early debug
console=ttyS0 gives you `late' kernel messages, plus user space console

> Anyway, it would be nice to have a serial console (system messages during
> boot) as soon as possible and we should setup at least Crest as well for
> using such a serial console. Due to it's VGA output and the FlickerFixer,
> Kullervo don't need this as urgent as Crest and Elgar, IMHO...

Then you should probably use `debug=ser console=ttyS0', and set up
amiga-lilo to use the serial console.

Gr{oetje,eeting}s,

                                                Geert

--
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In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds


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Re: Serial Console Support in Kernel

by Ingo Juergensmann-4 :: Rate this Message:

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On Thu, Jun 12, 2008 at 09:28:40AM +0200, Geert Uytterhoeven wrote:

> On Thu, 12 Jun 2008, Ingo Juergensmann wrote:
> > Would be nice to have, yes, but it's difficult to use when there's a
> > non-booting kernel and you can't change the commandline remotely to boot
> > another kernel. ;)
> One of my wild plans is to get kexec working.  Then you can boot your test
> kernel using kexec. If it crashes, just reboot, and the normal bootloader
> boots the known-good kernel.

Yes, that would be great, especially when the IP power switches are
installed at the data center. ;)

IIRC, Smurf did some Amiga Shell scripting to emulate a similar behavior:
if a certain file exists, rename it and boot that file/kernel. On the next
boot the old kernel is loaded. That way a new kernel could be tested and if
it's working properly it can be installed the proper way as the default
kernel.

Hmmm, maybe I (or someone else) can write such a script...

> > A real Amiga bootloader with serial console would be really great for this!
> > ;)
> Hey, amiga-lilo does have serial support!

Oh, amiga-lilo is actually working? Last I heard was that it had some issues
and development was stuck.

> > > debug=ser is active once consoles have been set up (and it looks like you
> > > should be able to use it as command console as well).
> > Well, when the consoles are up you can use the normal serial console as
> > well. I don't know what's the difference when you set debug=ser without
> > looking it up...  
> debug=ser also gives you kernel messages, inclusing early debug
> console=ttyS0 gives you `late' kernel messages, plus user space console

Ah, ok, I'll add debug=ser on Elgar then...

> > Anyway, it would be nice to have a serial console (system messages during
> > boot) as soon as possible and we should setup at least Crest as well for
> > using such a serial console. Due to it's VGA output and the FlickerFixer,
> > Kullervo don't need this as urgent as Crest and Elgar, IMHO...
> Then you should probably use `debug=ser console=ttyS0', and set up
> amiga-lilo to use the serial console.

Well, I would prefer to test amiga-lilo locally before setting it up on
remote hosts. ;)
But adding the kernel params is a quick fix... ;)

Erm, where can I get amiga-lilo? Aminet?

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Re: Serial Console Support in Kernel

by Geert Uytterhoeven :: Rate this Message:

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On Thu, 12 Jun 2008, Ingo Juergensmann wrote:
> On Thu, Jun 12, 2008 at 09:28:40AM +0200, Geert Uytterhoeven wrote:
> > On Thu, 12 Jun 2008, Ingo Juergensmann wrote:
> > > A real Amiga bootloader with serial console would be really great for this!
> > > ;)
> > Hey, amiga-lilo does have serial support!
>
> Oh, amiga-lilo is actually working? Last I heard was that it had some issues
> and development was stuck.

I think so. IIRC Roman Zippel fixed '060 support.

I'm still using my old binaries (from 1997?), as my floppy drive is
probably dead, and thus I'm a bit reluctant to change it.

> > > Anyway, it would be nice to have a serial console (system messages during
> > > boot) as soon as possible and we should setup at least Crest as well for
> > > using such a serial console. Due to it's VGA output and the FlickerFixer,
> > > Kullervo don't need this as urgent as Crest and Elgar, IMHO...
> > Then you should probably use `debug=ser console=ttyS0', and set up
> > amiga-lilo to use the serial console.
>
> Well, I would prefer to test amiga-lilo locally before setting it up on
> remote hosts. ;)

Of course.

> But adding the kernel params is a quick fix... ;)
>
> Erm, where can I get amiga-lilo? Aminet?

cvs.linux-m68k.org, CVS module m68kboot.

Gr{oetje,eeting}s,

                                                Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds


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Re: Serial Console Support in Kernel

by Michael Schmitz-6 :: Rate this Message:

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Hi,

>>> (Geert: could we leave the corresponding chunk in chipram untouched for
>>> reading it out using a different kernel (or different parameter, like
>>> debug=getmem ??)
>
> Should be possible. Probably the nicest would be to copy the old data
> somewhere else, and provide it to the user of the new kernel through sysfs...

Thanks, I'll look into that. crest spontaneously rebooted two days ago;
debug=mem might help, well, debug that.

>> Would be nice to have, yes, but it's difficult to use when there's a
>> non-booting kernel and you can't change the commandline remotely to boot
>> another kernel. ;)
>
> One of my wild plans is to get kexec working.  Then you can boot your test
> kernel using kexec. If it crashes, just reboot, and the normal bootloader
> boots the known-good kernel.

Wild plans indeed :-)

>> A real Amiga bootloader with serial console would be really great for this!
>> ;)
>
> Hey, amiga-lilo does have serial support!

Good, now we just have to get all these boxes to use amiga-lilo (from
memory, at least kullervo needs to load some sort of AmigaOS 060 support
library before amiboot works - does amiga-lilo require such tricks as
well?)

Cheers,

  Michael


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Re: Serial Console Support in Kernel

by Geert Uytterhoeven :: Rate this Message:

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On Thu, 12 Jun 2008, Michael Schmitz wrote:
> > > A real Amiga bootloader with serial console would be really great for
> > > this!
> > > ;)
> >
> > Hey, amiga-lilo does have serial support!
>
> Good, now we just have to get all these boxes to use amiga-lilo (from memory,
> at least kullervo needs to load some sort of AmigaOS 060 support library
> before amiboot works - does amiga-lilo require such tricks as well?)

I assume Roman can tell you...

Gr{oetje,eeting}s,

                                                Geert

--
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In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
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Re: Serial Console Support in Kernel

by Michael Schmitz-6 :: Rate this Message:

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>>> Hey, amiga-lilo does have serial support!
>>
>> Good, now we just have to get all these boxes to use amiga-lilo (from memory,
>> at least kullervo needs to load some sort of AmigaOS 060 support library
>> before amiboot works - does amiga-lilo require such tricks as well?)
>
> I assume Roman can tell you...

Just saw your other mail (hey, you guys awake yet ... I started to miss
these instant replies :-). If you say 060 support has been fixed I'll take
your word for it.

Is that the same CVS server as the one for fbutils? Could not log on
to that one the other day...

  Michael




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Re: Serial Console Support in Kernel

by Christian T. Steigies :: Rate this Message:

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On Thu, Jun 12, 2008 at 10:42:49AM +0200, Ingo Juergensmann wrote:

> On Thu, Jun 12, 2008 at 09:28:40AM +0200, Geert Uytterhoeven wrote:
>
> > On Thu, 12 Jun 2008, Ingo Juergensmann wrote:
> > > Would be nice to have, yes, but it's difficult to use when there's a
> > > non-booting kernel and you can't change the commandline remotely to boot
> > > another kernel. ;)
> > One of my wild plans is to get kexec working.  Then you can boot your test
> > kernel using kexec. If it crashes, just reboot, and the normal bootloader
> > boots the known-good kernel.
>
> Yes, that would be great, especially when the IP power switches are
> installed at the data center. ;)
>
> IIRC, Smurf did some Amiga Shell scripting to emulate a similar behavior:
> if a certain file exists, rename it and boot that file/kernel. On the next
> boot the old kernel is loaded. That way a new kernel could be tested and if
> it's working properly it can be installed the proper way as the default
> kernel.
>
> Hmmm, maybe I (or someone else) can write such a script...

I wrote a couple of scripts which are now used on crest and kullervo to
switch betwen different kernels, taking into account if the last kernel booted
successfully or not. There are not very pretty, but they seem to do the job.
You should be able to see them on crest/kullervo.
 
> > > A real Amiga bootloader with serial console would be really great for this!
> > > ;)
> > Hey, amiga-lilo does have serial support!
>
> Oh, amiga-lilo is actually working? Last I heard was that it had some issues
> and development was stuck.

My last try with Amiga-lilo created a crashing bootblock, there were
problems on 060s...
 

> > > > debug=ser is active once consoles have been set up (and it looks like you
> > > > should be able to use it as command console as well).
> > > Well, when the consoles are up you can use the normal serial console as
> > > well. I don't know what's the difference when you set debug=ser without
> > > looking it up...  
> > debug=ser also gives you kernel messages, inclusing early debug
> > console=ttyS0 gives you `late' kernel messages, plus user space console
>
> Ah, ok, I'll add debug=ser on Elgar then...
>
> > > Anyway, it would be nice to have a serial console (system messages during
> > > boot) as soon as possible and we should setup at least Crest as well for
> > > using such a serial console. Due to it's VGA output and the FlickerFixer,
> > > Kullervo don't need this as urgent as Crest and Elgar, IMHO...
> > Then you should probably use `debug=ser console=ttyS0', and set up
> > amiga-lilo to use the serial console.
>
> Well, I would prefer to test amiga-lilo locally before setting it up on
> remote hosts. ;)
> But adding the kernel params is a quick fix... ;)
>
> Erm, where can I get amiga-lilo? Aminet?

I think there was a CVS on kullervo with the latest(?) source. I did build a
package of it a little while ago...
http://people.debian.org/~cts/debian-m68k/amiga-lilo/
 
I hope that is not the current source.

Christian


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Re: Serial Console Support in Kernel

by Ingo Juergensmann-4 :: Rate this Message:

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On Thu, Jun 12, 2008 at 11:42:41AM +0200, Christian T. Steigies wrote:

> I wrote a couple of scripts which are now used on crest and kullervo to
> switch betwen different kernels, taking into account if the last kernel booted
> successfully or not. There are not very pretty, but they seem to do the job.
> You should be able to see them on crest/kullervo.

No, I cannot... because DSA once thought it would be a nice idea to close my
account on Crest. ;)

> > > > A real Amiga bootloader with serial console would be really great for this!
> > > Hey, amiga-lilo does have serial support!
> > Oh, amiga-lilo is actually working? Last I heard was that it had some issues
> > and development was stuck.
> My last try with Amiga-lilo created a crashing bootblock, there were
> problems on 060s...

Maybe it's a good idea to test again? You're in front of aahz and can do
things, whileas I'm currently in Berlin whereas Spice is in Rostock and it's
still building packages.
A crashing bootblock does less harm on aahz at the moment than on spice. ;)
(I know: missing time ;)

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Re: Serial Console Support in Kernel

by Christian T. Steigies :: Rate this Message:

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New images for amiga and atari are here:
http://people.debian.org/~cts/debian-m68k/linux-image/
All other arches had SERIAL_CONSOLE already enabled, it seems.

On Thu, Jun 12, 2008 at 12:02:29PM +0200, Ingo Juergensmann wrote:
> On Thu, Jun 12, 2008 at 11:42:41AM +0200, Christian T. Steigies wrote:
>
> > I wrote a couple of scripts which are now used on crest and kullervo to
> > switch betwen different kernels, taking into account if the last kernel booted
> > successfully or not. There are not very pretty, but they seem to do the job.
> > You should be able to see them on crest/kullervo.
>
> No, I cannot... because DSA once thought it would be a nice idea to close my
> account on Crest. ;)

user-startup calls autoboot (it seems I do not need any 060 commands or
libraries, at least on kullervo).
;--- schnipp ---
;c:setpatch
;c:cpu060
EXECUTE s:autoboot
;--- schnapp ---

autoboot looks like this:
;--- schnipp ---
IF exists SYS:linux/boot-2.6.24-1
 ECHO "Booting kernel 2.6.24-1"
 WAIT 10
 DELETE SYS:linux/boot-2.6.24-1
 EXECUTE SYS:linux/Linuxstart-2.6.24-1
ELSE
 ECHO "no kernel 2.6.24-1"
ENDIF

IF exists SYS:linux/boot-2.6.22
 ECHO "Booting kernel 2.6.22"
 WAIT 10
 DELETE SYS:linux/boot-2.6.22
 EXECUTE SYS:linux/Linuxstart-2.6.22
ELSE
 ECHO "no kernel 2.6.22"
ENDIF

IF exists SYS:linux/boot-2.6.18-4
 ECHO "Booting kernel 2.6.18-4"
 WAIT 10
 DELETE SYS:linux/boot-2.6.18-4
 EXECUTE SYS:linux/Linuxstart-2.6.18-4
ELSE
 ECHO "Booting fallback kernel"
 WAIT 5
 EXECUTE c:Linuxstart
ENDIF

c:Linuxstart-2.4.31
;--- schnapp ---

linux/Linuxstart-2.6.24-1 is created by a script, looks like this:
;--- schnipp ---
sys:bin/amiboot-5.6 -k sys:linux/vmlinux-2.6.24-1-amiga root=/dev/sdb4
video=amifb debug-mem
;--- schnapp ---

to /etc/crontab I added this
;--- schnipp ---
@reboot         root    /usr/local/sbin/select-kernelversion boot
;--- schnapp ---

select-kernelversion is this script (which is slightly different on crest
and kullervo for the ADOS and ROOT variables)
;--- schnipp ---
#! /bin/bash
# select kernelversion
# install: copy uncompressed vmlinux to Amiga DOS partition, create boot
# script
# boot: create AmigaOS file to select default boot kernel

#VER=2.6.18-4
VER=2.6.24-1
ARCH=amiga
ADOS=/dev/sda1
ROOT=/dev/sdb4

echo "kernel version vmlinux-$VER-$ARCH"

case "$1" in
install)
  if [ -e "/boot/vmlinuz-$VER-$ARCH" ]; then
    mount $ADOS /mnt
    gunzip -cd /boot/vmlinuz-$VER-$ARCH > /mnt/linux/vmlinux-$VER-$ARCH
    echo \
     "sys:bin/amiboot-5.6 -k sys:linux/vmlinux-$VER-$ARCH root=$ROOT video=amifb debug-mem" > /mnt/linux/Linuxstart-$VER
    echo "yes"> /mnt/linux/boot-$VER
    ls -l /mnt/linux/
    umount /mnt
  fi
  ;;
 
boot)
  if [ -e "/boot/vmlinuz-$VER-$ARCH" ]; then
    mount $ADOS /mnt
    echo "yes"> /mnt/linux/boot-$VER
    ls -l /mnt/linux/
    umount /mnt
  fi
  ;;
 
*)
  echo "Usage: select-kernelversion {install|boot}"
  exit 1
  ;;

esac

exit 0

;--- schnapp ---

When a new kernel is installed, the script should be called with the install
option, after VER has been updated. This kernel needs to be added (manually)
to the top of the autoboot script, so it will be tried first. If that kernel
fails to boot, on the next reboot, an older version will be tried, until one
boots. If the new kernel failed, on the next reboot it will be activated
again for autoboot, so this needs to be fixed manually as well. So a few
things could be made better, but it has been working fine so far and there
are several fallback kernels on the machine.

> Maybe it's a good idea to test again? You're in front of aahz and can do
> things, whileas I'm currently in Berlin whereas Spice is in Rostock and it's
> still building packages.
> A crashing bootblock does less harm on aahz at the moment than on spice. ;)
> (I know: missing time ;)

Since I need to reinstall, it can not hurt. But you guessed where the real
problem is...

Christian


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Re: Serial Console Support in Kernel

by Roman Zippel :: Rate this Message:

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Hi,

On Thu, 12 Jun 2008, Geert Uytterhoeven wrote:

> > Oh, amiga-lilo is actually working? Last I heard was that it had some issues
> > and development was stuck.
>
> I think so. IIRC Roman Zippel fixed '060 support.

Yes, it works fine on 060.
The only bigger issue I know of is partitions above 4GB. I played with
sending SCSI commands, but that doesn't work with SCSI emulation on IDE
drives above 4GB.

> I'm still using my old binaries (from 1997?), as my floppy drive is
> probably dead, and thus I'm a bit reluctant to change it.

I'm using a second boot partition for that. :)
If one has never setup amiga-lilo it's likely to be a big help, I think
it can be even any affs partition, as one will at least get a shell
prompt.
Maybe parted could be utilizied to help with setting this up correctly...

> > But adding the kernel params is a quick fix... ;)
> >
> > Erm, where can I get amiga-lilo? Aminet?
>
> cvs.linux-m68k.org, CVS module m68kboot.

That's were the development for the Amiga support is a little stuck.
The latest release version from me is at
http://www.xs4all.nl/~zippel/amiga-lilo-2.3.tar.gz

bye, Roman


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