Minimal requirements to run L4linux using only a serial console

Masti Ramya Jayaram rmasti at inf.ethz.ch
Fri Aug 29 15:55:29 CEST 2014


Hey Martin,

Back on the list ;-)

Ok, I can confirm that when I busy loop during fiasco init, I can actually see the character that I typed. So would I have to change the l4ser driver in Linux or the main driver in under pkg/l4/bootstrap or under fiasco in vkey.cpp? :)

Thanks,
ramya
________________________________________
From: Masti  Ramya Jayaram
Sent: 29 August 2014 12:15
To: Martin Schröder; l4-hackers at os.inf.tu-dresden.de
Subject: RE: Minimal requirements to run L4linux using only a serial console

Hey Martin,

I cleaned up my build and it worked - the mistake was mine. I had a question regarding ACPI. The target machine I am using has no BIOS/ACPi support. So, when I boot linux on it my console input does not work.This is similar to booting in qemu with the -no-acpi option. Serial console output works (I can see the prompt of L4Linux) but input does not.

Is there something special to do when booting with a serial console but no ACPI tables?

Thanks,
ramya
________________________________________
From: Martin Schröder [martin.schroeder at openlimit.com]
Sent: 27 August 2014 18:32
To: Masti  Ramya Jayaram; l4-hackers at os.inf.tu-dresden.de
Subject: Re: Minimal requirements to run L4linux using only a serial console

Hi Masti,

you have  all of them already! I did not alter any other file beside the files you already sent. I inserted them into a fresh
snapshot (http://l4re.org/download/snapshots-oc/l4re-snapshot-2014053111.tar.xz) and started building. Since "drops-rd.rd" was not
found in the snapshot, I just renamed "ramdisk-x86.rd" to "drops-rd.rd". Nothing more.

Martin



Am 27.08.2014 um 18:02 schrieb Masti Ramya Jayaram:
> Hey Martin,
>
> thanks for the quick response. Could you send me your configs (l4linux, fiasco, l4re) so that I can try it with that?
>
> Thanks,
> Ramya
> ________________________________________
> From: l4-hackers [l4-hackers-bounces at os.inf.tu-dresden.de] on behalf of Martin Schröder [martin.schroeder at openlimit.com]
> Sent: 27 August 2014 16:28
> To: l4-hackers at os.inf.tu-dresden.de
> Subject: Re: Minimal requirements to run L4linux using only a serial console
>
> Hi Masti,
>
> I just applied your config, replaced "drops-rd.rd" by "ramdisk-x86.rd" and everything (command prompt, debugger) runs fine as
> expected in Qemu. Maybe you ran into a similar problem as described in this thread:
>
> http://os.inf.tu-dresden.de/pipermail/l4-hackers/2012/thread.html#5165
>
>
> Best regards,
>      Martin
>
>
> Am 27.08.2014 um 15:18 schrieb Masti Ramya Jayaram:
>> Sorry, a couple of typos in the l4linux.cfg
>> --vim:set ft=lua:
>>
>>
>> L4.default_loader:start({ caps = {
>>         log = L4.Env.log:m("rws"),
>>       },
>>       l4re_dbg = L4.Dbg.Warn,
>>       log = { "l4linux", "yellow" },
>>     }, "rom/vmlinuz mem=64M console=ttyLv0 l4x_rd=rom/drops-rd.rd root=1:0 ramdisk_size=4000 l4ser.vkey_enable=1");
>>
>> Thanks in advance,
>> ramya
>>
>> ________________________________________
>> From: l4-hackers [l4-hackers-bounces at os.inf.tu-dresden.de] on behalf of Masti  Ramya Jayaram [rmasti at inf.ethz.ch]
>> Sent: 27 August 2014 14:07
>> To: l4-hackers at os.inf.tu-dresden.de
>> Subject: Minimal requirements to run L4linux using only a serial console
>>
>> Dear all,
>>
>> I am trying to run L4linux on fiasco/l4re but with the keyboard and VGA disabled. I can get all the way to the command prompt (of the shell) in the initramfs but then, on pressing a key, I get a page fault and I cannot debug the system anymore using the serial_esc. I suspect it is my configuration which I have provided below. I was wondering what the minimal packages are to achieve this.
>>
>> modules.list:
>> entry l4linux
>> kernel fiasco -serial_esc -freq=533000
>> roottask moe rom/l4linux.cfg
>> module l4re
>> module ned
>> module l4linux.cfg
>> module io
>> module vmlinuz
>> module drops-rd.rd
>>
>> I have disabled the framebuffer and input server in the L4linux stub drivers configuration and enabled the serial console.
>>
>> l4linux.cfg:
>>
>> --vim:set ft=lua:
>>
>> L4.default_loader:start({ caps = {
>>         log = L4.Env.log:m("rws"),
>>       },
>>       l4re_dbg = L4.Dbg.Warn,
>>       log = { "l4linux", "yellow" },
>>     }, "rom/io -vvvv rom/vmlinuz mem=64M console=ttyLv0 l4x_rd=rom/drops-rd.rd root=1:0 ramdisk$
>>
>>
>> I also specify a custom frequency for my board to fiasco.oc, do I have to make similar modifications to l4linux (e.g., Timer frequency)?
>>
>> Thanks,
>> Ramya
>>
>>
>>
>> _______________________________________________
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>
>
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