After I Enabled OpenGL driver, it can work but only black screen

[vivian0239]

Hi,
Many thanks to this repo, it saved me a lot of time. Now I am using Pi zero and 240*240 LCD without CS pin. Everything is good until I Enabled OpenGL driver, it can work but only black screen. The reason I enabled OpenGL driver is my qml run quite slow, but after I opened OpenGL, it runs faster. Who can tell me how can I get the frame buffer copy? Thank you!