Hi Michael,
we had very similar issue, which we encountered when updating to gstreamer
1.6. Using git bisect we were able to find a root cause and prepare simple
test program, which reliably reproduces the issue:
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
int size;
uint8_t *memblock;
if (argc < 2)
return -1;
size = atoi(argv[1]);
memblock = malloc(size);
while (1)
{
memset(&memblock[0], 0, size);
}
free(memblock);
return 0;
}
starting this program will cause crazy flickering, ...
We were able to reproduce the issue with
1) debian originally provided on beaglebone using memtest utility for
carlos. Kernel version was:
Linux version 3.8.13-bone70 (root@a5-imx6q-wandboard-2gb) (gcc version
4.6.3 (Debian 4.6.3-14) ) #1 SMP Fri Jan 23 02:15:42 UTC 2015
2) latest version of debian from beaglebone website Kernel version was:
Linux version 4.1.15-ti-rt-r43 (root@a4-imx6q-wandboard-2gb) (gcc version
4.9.2 (Debian 4.9.2-10) ) #1 SMP PREEMPT RT Thu Jan 21 20:13:58 UTC 2016
so it seems to be existing for ages.
Did you in the mean time managed to find a solution for your problem?
Thanks,
Radek
On Monday, February 8, 2016 at 1:18:50 PM UTC+1, Michael Liesenberg wrote:
>
> Hi there,
>
>
> i was able to get my 10.1 custom Display to work with the RGB Pins on the
> beaglebone black.
>
> I am using the latest Debian Jessie image from beagleboard.org and the
> X11 Desktop has the right colors and the right size.
>
> So i assume that the Timings from my display are correct.
>
>
> panel {
>
> status = "okay";
>
> compatible = "ti,tilcdc,panel";
>
> pinctrl-names = "default";
>
> pinctrl-0 = <&bb_lcd_lcd_pins>;
>
> panel-info {
>
> ac-bias = <255>;
>
> ac-bias-intrpt = <0>;
>
> dma-burst-sz = <16>;
>
> bpp = <32>;
>
> fdd = <0x80>;
>
> tft-alt-mode = <0>;
>
> stn-565-mode = <0>;
>
> mono-8bit-mode = <0>;
>
> sync-edge = <0>;
>
> sync-ctrl = <1>;
>
> raster-order = <0>;
>
> fifo-th = <0>;
>
> };
>
> display-timings {
>
> native-mode = <&timing0>;
>
> timing0: 1280x800 {
>
> clock-frequency =
> <70000000>;
>
> hactive = <1280>;
>
> vactive = <800>;
>
> hfront-porch = <80>;
>
> hback-porch = <60>;
>
> hsync-len = <20>;
>
> vback-porch = <12>;
>
> vfront-porch = <8>;
>
> vsync-len = <3>;
>
> hsync-active = <0>;
>
> vsync-active = <0>;
>
> };
>
> };
>
> };
>
>
> But when i play a video or when i have many frames on the display i get
> some screen flickers.
>
>
> On the log via UART i see the following:
>
>
> 1- When booting up: of_graph_get_next_endpoint(): no port node found in
> /ocp/lcdc@4830e000
>
> 2- When video or many frames are displayed:
>
> tilcdc 4830e000.lcdc: tilcdc_crtc_irq(0x00000020): FIFO underflow
>
> tilcdc 4830e000.lcdc: tilcdc_crtc_irq(0x00000004): Sync lost
>
>
> Any idea?
>
>
> Is the DDR flash rate to slow? Or the DMA buffer not big enougth?
>
>
>
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups
"BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
