Hello, thanks again. so today i have try now with a HDMI TFT 1280x800 (EDID compatible) to force the Resolution to 800x480.
For this, i have try to edit the uEnv.txt file: root@beaglebone:/media/root/rootfs/boot# vi uEnv.txt *then i have edit the cmdline as follow, but unfortunately the resolution does not change after restart, so whats wrong?:* uname_r=3.8.13-bone70 #dtb= cmdline=coherent_pool=1M quiet video=HDMI-A-1:800x480M@60e cape_universal=disable init=/lib/systemd/systemd ##Example then i have Am Sonntag, 19. Juni 2016 20:29:42 UTC+2 schrieb William Hermans: > > I guess RPi provides a similar feature, and you need not manually handle >> them using the config.txt file. >> > > The rPI BSP is a mess compared to the beaglebone. As far as I can tell > there is nothing standard about it. However, it does make some things > easier. Just as an example, here is some of the file structure, on my rPI3 > Rasbian Jessie. > > william@rpi:~$ lsblk > NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT > sda 8:0 0 931.5G 0 disk > └─sda1 8:1 0 931.5G 0 part > mmcblk0 179:0 0 14.7G 0 disk > ├─mmcblk0p1 179:1 0 60M 0 part /boot > └─mmcblk0p2 179:2 0 14.6G 0 part / > > william@rpi:~$ ls /boot/ > bcm2708-rpi-b.dtb bcm2710-rpi-3-b.dtb COPYING.linux fixup_x.dat > LICENCE.broadcom start_db.elf > bcm2708-rpi-b-plus.dtb bootcode.bin fixup_cd.dat issue.txt > LICENSE.oracle start.elf > bcm2708-rpi-cm.dtb cmdline.txt fixup.dat kernel7.img > overlays start_x.elf > bcm2709-rpi-2-b.dtb config.txt fixup_db.dat kernel.img > start_cd.elf > > william@rpi:~$ cat /boot/cmdline.txt > dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 > root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes > rootwait > > william@rpi:~$ cat /boot/config.txt > # For more options and information see > # http://www.raspberrypi.org/documentation/configuration/config-txt.md > # Some settings may impact device functionality. See link above for details > > # uncomment if you get no picture on HDMI for a default "safe" mode > #hdmi_safe=1 > > # uncomment this if your display has a black border of unused pixels > visible > # and your display can output without overscan > #disable_overscan=1 > > # uncomment the following to adjust overscan. Use positive numbers if > console > # goes off screen, and negative if there is too much border > #overscan_left=16 > #overscan_right=16 > #overscan_top=16 > #overscan_bottom=16 > > # uncomment to force a console size. By default it will be display's size > minus > # overscan. > #framebuffer_width=1280 > #framebuffer_height=720 > > # uncomment if hdmi display is not detected and composite is being output > #hdmi_force_hotplug=1 > > # uncomment to force a specific HDMI mode (this will force VGA) > #hdmi_group=1 > #hdmi_mode=1 > > # uncomment to force a HDMI mode rather than DVI. This can make audio work > in > # DMT (computer monitor) modes > #hdmi_drive=2 > > # uncomment to increase signal to HDMI, if you have interference, > blanking, or > # no display > #config_hdmi_boost=4 > > # uncomment for composite PAL > #sdtv_mode=2 > > #uncomment to overclock the arm. 700 MHz is the default. > #arm_freq=800 > > # Uncomment some or all of these to enable the optional hardware interfaces > #dtparam=i2c_arm=on > #dtparam=i2s=on > #dtparam=spi=on > > # Uncomment this to enable the lirc-rpi module > #dtoverlay=lirc-rpi > > # Additional overlays and parameters are documented /boot/overlays/README > > # Enable audio (loads snd_bcm2835) > dtparam=audio=on > > > > On Sun, Jun 19, 2016 at 8:48 AM, TJF <[email protected] <javascript:>> > wrote: > >> >> >> Am Sonntag, 19. Juni 2016 00:18:00 UTC+2 schrieb epi kao: >>> >>> thanks, and yes i already knew this link. >>> But there is only explained how to read (for debug) the EDID infos. That >>> is not really usefull. I need more functions as only resolution and refresh >>> rate.... >>> >>> So it seems that with a raspberry i have more adjust functions to set >>> the hdmi output-timings? >>> >> >> Why do you think you have to provide this additional information? Let the >> frame buffer driver compute them. Therefor, as William mentioned, specify >> the cmdline variable in file /boot/uEnv.txt like >> >> >>> cmdline=coherent_pool=1M quiet *video=HDMI-A-1:800x480M@60e* >>> cape_universal=disable init=/lib/systemd/systemd >>> >> >> Note the "M" after the resolution here. It requires individual >> calculation of the timings (in contrast to reading them from a pre-defined >> table, see framebuffer documentation for details). That way you can skip >> EDID and specify any resolution in a convenient way. I guess RPi provides a >> similar feature, and you need not manually handle them using the config.txt >> file. >> >> BR >> >> -- >> 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] <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/a25953ef-3420-4ad2-92e7-285418c34488%40googlegroups.com >> >> <https://groups.google.com/d/msgid/beagleboard/a25953ef-3420-4ad2-92e7-285418c34488%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/ab37e135-bfe6-45b7-8efa-4c991d81f2d7%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
