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mripard / sunxi-mali

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Blank screen with Mali fbdev on Cubieboard2 A20 kernel >= 4.20 and solution #90

Closed hor63 closed 3 years ago

hor63 commented 3 years ago

When I run test.c on a Cubieboard with A20 under Kernel 5.10.48 with OOTB dtb for Cubieboard2 the screen remains black. I followed all your instructions to enable physical address leaking, and the test program produces all EGL and OpenGL ES 2.0 information properly. I can also switch back to console by switching to another console and back with ALT-F2 and ALT-F1. But Mali does not render the image.

Solution: Add the parameter "cma=256M" to boot.cmd to the the kernel boot arguments like this:

setenv bootargs console=tty0 root=/dev/mmcblk0p2 rootwait consoleblank=0 panic=10 drm_kms_helper.drm_leak_fbdev_smem=1 cma=256M

You may want to add this hint to you readme. Thanks.

giuliobenetti commented 3 years ago

@hor63 thanks a lot for pointing, I've just opened #91 for this.

hor63 commented 3 years ago

Solved by y #91