->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. _______________________________________________ boot-architecture mailing list -- boot-architecture@lists.linaro.org To unsubscribe send an email to boot-architecture-le...@lists.linaro.org
