* yaboot: text mode or graphics mode?
@ 2008-12-20 16:07 sumedh tirodkar
2008-12-20 17:56 ` sumedh tirodkar
0 siblings, 1 reply; 5+ messages in thread
From: sumedh tirodkar @ 2008-12-20 16:07 UTC (permalink / raw)
To: linuxppc-embedded
Does anyone knw what happens when we boot into yaboot,whether we are
in text mode or graphics mode? If text mode then wat is the address of
the screen? I need it to print some debug info..bt i either dnt seem
to get the buffer address correct or i m not in text mode as yaboot
has already switched to some other mode...
Regards,
Sumedh
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: yaboot: text mode or graphics mode?
2008-12-20 16:07 yaboot: text mode or graphics mode? sumedh tirodkar
@ 2008-12-20 17:56 ` sumedh tirodkar
2008-12-30 22:45 ` Matt Sealey
0 siblings, 1 reply; 5+ messages in thread
From: sumedh tirodkar @ 2008-12-20 17:56 UTC (permalink / raw)
To: linuxppc-embedded
I just found out that openfirmware boots into graphics mode(non-text
mode). Now i wish to switch back to text mode. how do i do this?
On Sat, Dec 20, 2008 at 9:37 PM, sumedh tirodkar
<sumedhtirodkar@gmail.com> wrote:
> Does anyone knw what happens when we boot into yaboot,whether we are
> in text mode or graphics mode? If text mode then wat is the address of
> the screen? I need it to print some debug info..bt i either dnt seem
> to get the buffer address correct or i m not in text mode as yaboot
> has already switched to some other mode...
>
> Regards,
> Sumedh
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: yaboot: text mode or graphics mode?
2008-12-20 17:56 ` sumedh tirodkar
@ 2008-12-30 22:45 ` Matt Sealey
2009-01-05 5:31 ` sumedh tirodkar
0 siblings, 1 reply; 5+ messages in thread
From: Matt Sealey @ 2008-12-30 22:45 UTC (permalink / raw)
To: sumedh tirodkar; +Cc: linuxppc-embedded
sumedh tirodkar wrote:
> I just found out that openfirmware boots into graphics mode(non-text
> mode). Now i wish to switch back to text mode. how do i do this?
Unfortunately unless you are running some kind of yaboot-accessible or
firmware-accessible x86 BIOS emulation, this isn't possible.
--
Matt
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: yaboot: text mode or graphics mode?
2008-12-30 22:45 ` Matt Sealey
@ 2009-01-05 5:31 ` sumedh tirodkar
2009-01-06 1:04 ` Matt Sealey
0 siblings, 1 reply; 5+ messages in thread
From: sumedh tirodkar @ 2009-01-05 5:31 UTC (permalink / raw)
To: Matt Sealey; +Cc: linuxppc-dev
Isn't there any other way that i can access the VGA registers? So as
to reconfigure them...
-Sumedh
On Wed, Dec 31, 2008 at 4:15 AM, Matt Sealey <matt@genesi-usa.com> wrote:
> sumedh tirodkar wrote:
>>
>> I just found out that openfirmware boots into graphics mode(non-text
>> mode). Now i wish to switch back to text mode. how do i do this?
>
> Unfortunately unless you are running some kind of yaboot-accessible or
> firmware-accessible x86 BIOS emulation, this isn't possible.
>
> --
> Matt
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: yaboot: text mode or graphics mode?
2009-01-05 5:31 ` sumedh tirodkar
@ 2009-01-06 1:04 ` Matt Sealey
0 siblings, 0 replies; 5+ messages in thread
From: Matt Sealey @ 2009-01-06 1:04 UTC (permalink / raw)
To: sumedh tirodkar; +Cc: linuxppc-dev
They should be mapped into PCI address space with the rest, you should
note though that a bunch of people have asked this a bunch of times and
the response is usually null.
If you want to output debugging info, try a serial port, or if you're
still at the point in boot where the OF is still around, you can still
output to it (check prom_init.c) and if not, the open firmware
framebuffer console driver is your best friend..
sumedh tirodkar wrote:
> Isn't there any other way that i can access the VGA registers? So as
> to reconfigure them...
>
> -Sumedh
>
> On Wed, Dec 31, 2008 at 4:15 AM, Matt Sealey <matt@genesi-usa.com> wrote:
>> sumedh tirodkar wrote:
>>> I just found out that openfirmware boots into graphics mode(non-text
>>> mode). Now i wish to switch back to text mode. how do i do this?
>> Unfortunately unless you are running some kind of yaboot-accessible or
>> firmware-accessible x86 BIOS emulation, this isn't possible.
>>
>> --
>> Matt
>>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2009-01-06 1:04 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2008-12-20 16:07 yaboot: text mode or graphics mode? sumedh tirodkar
2008-12-20 17:56 ` sumedh tirodkar
2008-12-30 22:45 ` Matt Sealey
2009-01-05 5:31 ` sumedh tirodkar
2009-01-06 1:04 ` Matt Sealey
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