->The way operating systems detect monitor resolution is by reading the ->EDID information via the I2C lines of the HDMI connector.
->U-Boot has CONFIG_I2C_EDID to build a module to parse EDID information. ->This is not enabled by khadas-edge-v-rk3399_defconfig. Here it is. I'm here to show you the proof that your suggestion had something that did not convince me. I've just remembered that I had two displays,stored inside the shelf,that could be tested,to see if they work with u-boot and the khadas-edge-v. The first one is a 4 inch display,720x720 from waveshare,the second one is a 480x480 from a Chinese brand. The result that I've got is the same for both : https://drive.google.com/file/d/1InM4f4DLcYX8Y3ntERItnhwVuEnmHWeK/view?usp=sharing What happens is that u-boot is able to show the first stage of messages on the screen and then it becomes black and it remains black.... On Wed, Aug 20, 2025 at 1:54 PM Mario Marietto <marietto2...@gmail.com> wrote: > ->The way operating systems detect monitor resolution is by reading the > ->EDID information via the I2C lines of the HDMI connector. > > ->U-Boot has CONFIG_I2C_EDID to build a module to parse EDID information. > ->This is not enabled by khadas-edge-v-rk3399_defconfig. > > Excuse Me for the "rude" question,but are you sure of what you say ? > Because if that was the case,u-boot didn't work even on my large HDMI > monitor with a resolution of 1920x1080. But it works there. Using the pure > logic reasoning I assume that it is able to parse EDID information. > > I'm also sure that it works with a monitor that has a lower resolution > than 1920x1080,maybe 1600x1440. Point here is that I think there is a > resolution limit under which it will stop working. > How can I know what this is ? > > The easier method is to buy a new display,let's say that runs at 1024x768 > and check,but...it costs money. I would like to know what this limit is > asking here and there. > > On Wed, Aug 20, 2025 at 12:55 PM Heinrich Schuchardt <xypron.g...@gmx.de> > wrote: > >> On 20.08.25 12:40, Mario Marietto wrote: >> > ---> U-Boot has CONFIG_I2C_EDID to build a module to parse EDID >> > information. >> >> This is not enabled by khadas-edge-v-rk3399_defconfig. I would assume >> >> this is part of the problem. >> > >> >> scripts/get_maintainer.pl configs/khadas-edge-v-rk3399_defconfig and >> >> scripts/get_maintainer.pl common/edid >> > >> > Hello. Since u-boot should be installed on FreeBSD,can you point me >> where I >> > can get the khadas-edge-v-rk3399_defconfig file and the u-boot code that >> > should be recompiled ? >> >> The U-Boot project is hosted at https://source.denx.de/u-boot/u-boot. >> >> FreeBSD's U-Boot port is described at >> https://www.freshports.org/sysutils/u-boot-master. >> >> Best regards >> >> Heinrich >> >> > >> > On Tue, Aug 19, 2025 at 6:23 PM Heinrich Schuchardt <xypron.g...@gmx.de >> > >> > wrote: >> > >> >> On 19.08.25 17:54, Mario Marietto wrote: >> >>> Hello. >> >>> >> >>> I've installed FreeBSD 14.2-RELEASE on both my boards (RockPro64 and >> >> Khadas >> >>> Edge V),both based on the Rockchip RK3399 and I've used a display that >> >> has >> >>> a resolution of 720 x 720 resolution and I saw that the screen remains >> >>> almost black (almost because I see a dim illumination coming from the >> >>> display) . >> >>> >> >>> I don't even see the u-boot logo. Instead,it is able to turn on my >> large >> >>> HDMI monitor,which has a resolution of 1920x1080 pixels. >> >>> >> >>> Since I'm building a FreeBSD modular phone, I want to use a small HDMI >> >>> display with a low resolution. My question is : why is u-boot able to >> >> turn >> >>> on a monitor that has a resolution of 1920x1080 and it's not able to >> turn >> >>> on the other HDMI display that has a resolution of 720x720 ? >> >>> >> >>> Or even better : what's the lowest resolution that will work ? >> >>> >> >>> If I want to buy a display that has a resolution of 800x600,will >> u-boot >> >> be >> >>> able to turn it on ? 1024x768 ? more ? >> >>> >> >>> Thanks. >> >>> >> >> >> >> Hello Mario, >> >> >> >> The way operating systems detect monitor resolution is by reading the >> >> EDID information via the I2C lines of the HDMI connector. >> >> >> >> U-Boot has CONFIG_I2C_EDID to build a module to parse EDID information. >> >> This is not enabled by khadas-edge-v-rk3399_defconfig. I would assume >> >> this is part of the problem. >> >> >> >> scripts/get_maintainer.pl configs/khadas-edge-v-rk3399_defconfig and >> >> scripts/get_maintainer.pl common/edid >> >> will provide the people and the U-Boot list that you could contact for >> >> support. >> >> >> >> There is also a #u-boot IRC channel at irc.libera.chat. >> >> >> >> Best regards >> >> >> >> Heinrich >> >> >> > >> > >> >> > > -- > Mario. > -- Mario. _______________________________________________ boot-architecture mailing list -- boot-architecture@lists.linaro.org To unsubscribe send an email to boot-architecture-le...@lists.linaro.org
