-------- Message original --------
Sujet: Re: AW: adding ports to the ss5.
Date : Sun, 17 Mar 2013 18:34:20 +0400
De : Artyom Tarasenko <atar4q...@gmail.com>
Pour : jean.michel.schr...@genavir.fr
Copie à : breuerr <breu...@mc.net>, "mark.cave-ayland"
<mark.cave-ayl...@ilande.co.uk>
Hi Jean Michel,
On 3/17/13, jean.michel.schr...@genavir.fr
<jean.michel.schr...@genavir.fr> wrote:
Is there a way to write to prom image ss5.bin? nvalias command does
not work because there's no nvram?
There is a nvram. But the proprietary firmware OBP - uses a different
layout than OpenBIOS. The current implementation of nvram doesn't
persist its content after shutting down or a hard reset. But, for your
experiments a soft-reset should be enough. Just use the 'reset'
command from the OBP ok prompt.
It should be possible to add some code to qemu that it would
read/write the contents of the nvram to a file.
Does this ss5.bin is a merely
direct copy of the real PROM?
Yes. ss5.bin is a copy of a real PROM.
we cannot pass command
through qemu start like -option-rom or -prom-env if not using
openbios.
We can not, because the layout is different.
So is there a way to modify ss5.bin?
None that I know of. If you have to use the proprietary firmware
(ss5.bin, ss20.bin and so on), I think extending qemu that it persists
nvram is the way to go. I think the initialization of the nvram
happens in sun4m.c. At least it used to be there. You'd have to add
some option like -nvram=file.bin which would disable -prom-env
options.
To add ports I am trying to modify sun4m.c and escc.c and add fields
qemu_irq & CharDriverState to the escc_init function. Is that the
correct way to do it?
I think so. Except that I'm not sure you have to modify escc.c. But
I'm sitting at the airport and don't have qemu sources handy.
The point is I do not understand everything in the code (I have the
formation but not been a developer for past couple of decade..). For
example I don't understand the line:
#define CHN_C(s) ((s)->chn == chn_b? 'b' : 'a')
An ESCC port has two channels (physical ports) which are called 'a' and 'b'.
Artyom
I know Mark said we should put this cg3 and other good stuff to the
updated version but I am powerless on this point. though I understand
it would be very nice to boot on openbios.
Thanks again for your help.
Cheers all.
Jean Michel
Artyom Tarasenko <atar4q...@gmail.com> a écrit :
ss5.bin doesn't auto detect the ports. You'll have to execute some
Forth commands at the OBP "ok" prompt to make them visible in the
device tree. Can't tell the exact commands right now. There is a free
book "writing device drivers" (the name might be not exact) from
Sun/Oracle. You can try looking up the example there.
Artyom
Sent from a mobile phone. Please excuse my brevity and autocorrected
typos.
----- Ursprüngliche Nachricht -----
Von: Jean-Michel SCHRAMM
Gesendet: 15.03.2013 19:02
An: Artyom Tarasenko
Betreff: adding ports to the ss5.
--
Regards,
Artyom Tarasenko
solaris/sparc under qemu blog: http://tyom.blogspot.com/search/label/qemu
