RPi fails to boot if gpu_mem=16
for a headless server, the gpu is not really needed. But when setting
this to the minimum of 16 MB, the RPI (version 1 Model B) does not
boot.
It will flash the green led 4 times periodically.
When setting this to 32 MB, Alpine boots without issues.
4 flashes means loader.bin or start.elf not launched
Are these files in the raspberry image supplied by Alpine Linux? If not,
feel free to close this issue.
(from redmine: issue id 9945, created on 2019-01-29)