I am running Linux with kernel from Android SDK in an Android emulator. When writing from /dev/urandom to /dev/fb0, nothing is drawn in the emulator window.
Why? Can you help me with this problem?
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Possibly related Why is the FrameBuffer missing on some Android devices?– Morrison ChangCommented Sep 17, 2022 at 21:21
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No, /dev/fb0 present, and fbset -s -fb /dev/fb0 mode "720x1280" geometry 720 1280 720 1280 32 timings 0 0 0 0 0 0 0 rgba 8/0,8/8,8/16,0/0 endmode– Pavel SamsonovCommented Sep 17, 2022 at 21:38
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1Found your earlier SO post for context for any reader. As you seem to be running a HAXM QEMU, I wonder if a ARM QEMU has the same issue.– Morrison ChangCommented Sep 17, 2022 at 22:05
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Yes, same problem with aarch64 qemu.– Pavel SamsonovCommented Sep 17, 2022 at 22:20
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I can give ssh access to qemu's configuration with x11 forwarding.– Pavel SamsonovCommented Sep 17, 2022 at 22:21
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1 Answer
I solved my problem with the following way to run the emulator:
emulator -avd TINYSYS -shell -qemu -usb -device usb-tablet -device virtio-vga,edid=on,xres=720,yres=1280 -kernel /home/root/emulator/rootfs/boot/vmlinuz-4.4.302 -tiny \\
-append 'selinux=0 no_timer_check clocksource=pit no-kvmclock console=0 cma=272M@0-4G mac80211_hwsim.radios=2 mac80211_hwsim.channels=2 skip_initramfs rootwait ro init=/sbin/init root=/dev/vdf2 .. .
/dev/vdf is the sdcard
Kernel rebuilt with virtio DRM support.