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by berolinux
Mon Dec 03, 2018 1:01 am
Forum: Device Tree
Topic: Enabling the VC4 DRM/KMS driver
Replies: 7
Views: 3609

Re: Enabling the VC4 DRM/KMS driver

Thanks! This has done a lot to fix it! I'm using the kernel's makefiles to generate the dtbs -- just "make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- dtbs". The command being executed seems to be mkdir -p arch/arm64/boot/dts/broadcom/ ; gcc -E -Wp,-MD,arch/arm64/boot/dts/broadcom/.bcm2837-rpi-3-b-p...
by berolinux
Sat Dec 01, 2018 9:23 am
Forum: Device Tree
Topic: Enabling the VC4 DRM/KMS driver
Replies: 7
Views: 3609

Re: Enabling the VC4 DRM/KMS driver

What do the following commands return? You may want to delete and rebuild the DT files to make sure they haven't been corrupted: DT files have been rebuilt several times (after each unsuccessful attempt to use them). With the latest builds on the rpi-4.20.y based kernel: $ fdtdump arch/arm64/boot/d...
by berolinux
Fri Nov 30, 2018 3:59 pm
Forum: Device Tree
Topic: Enabling the VC4 DRM/KMS driver
Replies: 7
Views: 3609

Re: Enabling the VC4 DRM/KMS driver

PhilE wrote:
Fri Nov 30, 2018 9:47 am

Code: Select all

$ sudo vcdbg log msg |& grep -v HDMI

Code: Select all

debug_sym: OpenVideoCoreMemoryFileWithOffset: Failed to get memory size via ioctl: Inappropriate ioctl for device(25)

Unable to open videocore memory access: -25
Probably vcdbg doesn't work on top of a 64-bit kernel?
by berolinux
Fri Nov 30, 2018 12:38 am
Forum: Device Tree
Topic: Enabling the VC4 DRM/KMS driver
Replies: 7
Views: 3609

Enabling the VC4 DRM/KMS driver

Hi, I'm trying to enable the VC4 DRM/KMS driver (tried with current rpi-4.14.y and rpi-4.20.y branches) -- the result is always the same: the module builds and loads, but doesn't do anything (no /dev/dri/* created, nothing in dmesg). I presume the problem is that the devicetree bits aren't seen. I t...

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