* [Buildroot] Orange Pi HDMI to VGA output
@ 2017-08-13 14:32 apin prastya
2017-09-04 21:50 ` Peter Korsgaard
0 siblings, 1 reply; 6+ messages in thread
From: apin prastya @ 2017-08-13 14:32 UTC (permalink / raw)
To: buildroot
Hello All,
I have successfully build the orangepi_one_defconfig. And able to boot and
output to serial console.
Its been a while I struggle with the HDMI output (I am using HDMI to VGA
converter) and no success to make the console output to HDMI.
Here what i have done so far :
1. enable sunxi board on buildroot config and set the .fex to
a20/orangepi.fex (attached orangepi.fex)
2. modify the boot.cmd to : setenv bootargs console=ttyS0,115200
console=tty0 console=tty1 hdmi.audio=EDID:0
disp.screen0_output_mode=1280x720p60 root=/dev/mmcblk0p2 rootwait panic=10
Anyone has clue to enable HDMI output please let me know.
Thanks,
--
Apin,
Indonesia
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [Buildroot] Orange Pi HDMI to VGA output
2017-08-13 14:32 [Buildroot] Orange Pi HDMI to VGA output apin prastya
@ 2017-09-04 21:50 ` Peter Korsgaard
2017-09-05 9:41 ` Kurt Van Dijck
0 siblings, 1 reply; 6+ messages in thread
From: Peter Korsgaard @ 2017-09-04 21:50 UTC (permalink / raw)
To: buildroot
>>>>> "apin" == apin prastya <apin.klas@gmail.com> writes:
> Hello All,
> I have successfully build the orangepi_one_defconfig. And able to boot and
> output to serial console.
> Its been a while I struggle with the HDMI output (I am using HDMI to VGA
> converter) and no success to make the console output to HDMI.
> Here what i have done so far :
> 1. enable sunxi board on buildroot config and set the .fex to
> a20/orangepi.fex (attached orangepi.fex)
> 2. modify the boot.cmd to : setenv bootargs console=ttyS0,115200
> console=tty0 console=tty1 hdmi.audio=EDID:0
> disp.screen0_output_mode=1280x720p60 root=/dev/mmcblk0p2 rootwait panic=10
> Anyone has clue to enable HDMI output please let me know.
> Thanks,
The orangepi_one_defconfig uses the mainline Linux kernel, which doesn't
support the HDMI output yet or use .fex files, so this won't work.
--
Bye, Peter Korsgaard
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Buildroot] Orange Pi HDMI to VGA output
2017-09-04 21:50 ` Peter Korsgaard
@ 2017-09-05 9:41 ` Kurt Van Dijck
2017-09-05 10:33 ` Peter Korsgaard
0 siblings, 1 reply; 6+ messages in thread
From: Kurt Van Dijck @ 2017-09-05 9:41 UTC (permalink / raw)
To: buildroot
> >>>>> "apin" == apin prastya <apin.klas@gmail.com> writes:
>
> > Hello All,
> > I have successfully build the orangepi_one_defconfig. And able to boot and
> > output to serial console.
> > Its been a while I struggle with the HDMI output (I am using HDMI to VGA
> > converter) and no success to make the console output to HDMI.
>
> > Here what i have done so far :
>
> > 1. enable sunxi board on buildroot config and set the .fex to
> > a20/orangepi.fex (attached orangepi.fex)
> > 2. modify the boot.cmd to : setenv bootargs console=ttyS0,115200
> > console=tty0 console=tty1 hdmi.audio=EDID:0
> > disp.screen0_output_mode=1280x720p60 root=/dev/mmcblk0p2 rootwait panic=10
>
> > Anyone has clue to enable HDMI output please let me know.
> > Thanks,
>
> The orangepi_one_defconfig uses the mainline Linux kernel, which doesn't
> support the HDMI output yet or use .fex files, so this won't work.
>
My experience with HDMI to VGA convertors, on a beaglebone:
an "HDMI to VGA" convertor needs power.
An HDMI port provides, per spec, up to 10mA or so.
So, if you're using such HDMI to VGA convertor:
The beaglebone has a polyfuse to enforce this current limit.
Then the HDMI to VGA will never actually power up and fail to
emit VGA signal.
I once managed to succeed here with bypassing the polyfuse with a wire.
Again, this experience was on a beaglebone!
Peters comment above still applies :-)
Kind regards,
Kurt
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Buildroot] Orange Pi HDMI to VGA output
2017-09-05 9:41 ` Kurt Van Dijck
@ 2017-09-05 10:33 ` Peter Korsgaard
2017-09-06 16:06 ` Julien CORJON
0 siblings, 1 reply; 6+ messages in thread
From: Peter Korsgaard @ 2017-09-05 10:33 UTC (permalink / raw)
To: buildroot
>>>>> "Kurt" == Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> writes:
Hi,
> My experience with HDMI to VGA convertors, on a beaglebone:
> an "HDMI to VGA" convertor needs power.
> An HDMI port provides, per spec, up to 10mA or so.
> So, if you're using such HDMI to VGA convertor:
> The beaglebone has a polyfuse to enforce this current limit.
> Then the HDMI to VGA will never actually power up and fail to
> emit VGA signal.
> I once managed to succeed here with bypassing the polyfuse with a wire.
Alternatively, the HDMI-to-VGA adapters I've seen typically can be
powered through USB (sometimes not exposed on the outside though).
--
Bye, Peter Korsgaard
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Buildroot] Orange Pi HDMI to VGA output
2017-09-05 10:33 ` Peter Korsgaard
@ 2017-09-06 16:06 ` Julien CORJON
2017-10-02 15:18 ` apin prastya
0 siblings, 1 reply; 6+ messages in thread
From: Julien CORJON @ 2017-09-06 16:06 UTC (permalink / raw)
To: buildroot
Hi,
Le 05/09/2017 ? 12:33, Peter Korsgaard a ?crit :
>>>>>> "Kurt" == Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> writes:
>
> Hi,
>
> > My experience with HDMI to VGA convertors, on a beaglebone:
>
> > an "HDMI to VGA" convertor needs power.
> > An HDMI port provides, per spec, up to 10mA or so.
> > So, if you're using such HDMI to VGA convertor:
> > The beaglebone has a polyfuse to enforce this current limit.
> > Then the HDMI to VGA will never actually power up and fail to
> > emit VGA signal.
> > I once managed to succeed here with bypassing the polyfuse with a wire.
>
> Alternatively, the HDMI-to-VGA adapters I've seen typically can be
> powered through USB (sometimes not exposed on the outside though).
>
I'm also trying to make a HDMI to VGA converter on an i.MX6 and just
discovered that most of them only support CEA resolutions [1]...
(720p,1080p, etc.)
This can be the issue with your 1280x720 resolution.
I would recommend to take a look in /sys/class/graphics/fbX/modes to see
the resolution negociated with your dongle.
Kind regards,
Julien
[1] https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Buildroot] Orange Pi HDMI to VGA output
2017-09-06 16:06 ` Julien CORJON
@ 2017-10-02 15:18 ` apin prastya
0 siblings, 0 replies; 6+ messages in thread
From: apin prastya @ 2017-10-02 15:18 UTC (permalink / raw)
To: buildroot
I was able to make an output to HDMI and using HDMI to VGA converter.
Using this kernel : https://github.com/megous/linux/tree/orange-pi-4.13
But the problem comes that the fb is outside the monitor (way too left).
And here the modes :
# cat /sys/class/graphics/fb0/modes
U:1920x1080p-0
For the height of the monitor is correct, but the width is wrong.
Already set screen resolution : disp.screen0_output_mode=EDID:1280x1024p60.
But not working.
On Wed, Sep 6, 2017 at 11:06 PM, Julien CORJON <corjon.j@ecagroup.com>
wrote:
> Hi,
>
> Le 05/09/2017 ? 12:33, Peter Korsgaard a ?crit :
> >>>>>> "Kurt" == Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> writes:
> >
> > Hi,
> >
> > > My experience with HDMI to VGA convertors, on a beaglebone:
> >
> > > an "HDMI to VGA" convertor needs power.
> > > An HDMI port provides, per spec, up to 10mA or so.
> > > So, if you're using such HDMI to VGA convertor:
> > > The beaglebone has a polyfuse to enforce this current limit.
> > > Then the HDMI to VGA will never actually power up and fail to
> > > emit VGA signal.
> > > I once managed to succeed here with bypassing the polyfuse with a
> wire.
> >
> > Alternatively, the HDMI-to-VGA adapters I've seen typically can be
> > powered through USB (sometimes not exposed on the outside though).
> >
>
> I'm also trying to make a HDMI to VGA converter on an i.MX6 and just
> discovered that most of them only support CEA resolutions [1]...
> (720p,1080p, etc.)
>
> This can be the issue with your 1280x720 resolution.
>
> I would recommend to take a look in /sys/class/graphics/fbX/modes to see
> the resolution negociated with your dongle.
>
> Kind regards,
>
> Julien
>
> [1] https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
--
Apin,
Indonesia
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2017-08-13 14:32 [Buildroot] Orange Pi HDMI to VGA output apin prastya
2017-09-04 21:50 ` Peter Korsgaard
2017-09-05 9:41 ` Kurt Van Dijck
2017-09-05 10:33 ` Peter Korsgaard
2017-09-06 16:06 ` Julien CORJON
2017-10-02 15:18 ` apin prastya
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