Am Dienstag, den 21.02.2017, 14:04 +0100 schrieb gianluca: > Hello everybody! > > I am fighting to enable ldb in Linux 4.9.7. In barebox the SAME > device-tree is modified by barebox to enable/disable the ldb or hdmi > depending on what is found. > > During Linux bootup with HDMI only, it works with no hassle. > > If booting with ldb it does not start the ldb driver registration due to > a panel/bridge missing. > > In the config of linux kernel I have (as imx_v6_v7_defconfig) all drm > and simple panel enabled. > > What is missing??? > > Best regards, > Gianluca > > -------- Forwarded Message -------- > Subject: Barebox 2017.02 works great but no Linux Framebuffer... :-/ > Date: Mon, 20 Feb 2017 16:36:06 +0100 > From: gianluca <gianlucarenzi@xxxxxxxxxxxxxxxxxxx> > To: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> > > Hello Sascha, > > During last week I was able to activate/deactivate the hdmi and ldb > nodes from internal device-tree of Barebox and everything is working great. > > Now I would like to boot up with the kernel 4.9.7 with the following > commandline but it fails. > > The kernelcmd line is: > > > console=ttymxc2,115200 rootwait noswap ip=none noinitrd rootfstype=nilfs2 root=/dev/mmcblk1p3 fec.macaddr=0x7a,0x3f,0x03,0xe3,0xa2,0xff system_rev=0xe3600000 system_serialnr=0x00000000 lcd_type=am1280800n3tz fastboot quiet loglevel=3 console=tty0 video=mxcfb0:dev=ldb,if=RGB24,bpp=32 fbmem=32M vmalloc=400M > > The problem is the ldb (imx-ldb.c you wrote in kernel > drivers/gpu/drm/imx...). It fails with the following error: > > > [ 7.526349] imx-ldb 2000000.aips-bus:ldb@020e0008: panel/bridge not found: /panel -- > > [ 7.526369] imx-drm display-subsystem: failed to bind 2000000.aips-bus:ldb@020e0008 (ops 0xc097aaa0): -517 > > [ 7.526785] imx-drm display-subsystem: master bind failed: -517 > > The device-tree is attached. > > The device tree is the same as Barebox (it has only an #included > commented out). > > Both hdmi and ldb nodes are initially left "disabled" then barebox > enable the node corresponding to the hardware found (i.e. it changes the > status to "okay") > > In barebox everything is working. > > In linux NOT. What is exactly a 'channel->bridge' and 'channel->panel' > in device-tree therminology? > > Barebox is working without it, so I suppose it was working in Linux > kernel too... No, Linux does not support DT defined modes in the panel. You need a panel with a proper compatible and driver. See drivers/gpu/drm/panel. For most LVDS panels simple-panel is what you want to use. Regards, Lucas _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
