I have a Debian on beaglebone without an X server and I need to get rid of any console output to the framebuffer device.
I was trying few things I found, like
console=null or kernel argument
vga=0, but without luck.
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You do not have a vga in your BeagleBone.
In my Lamobo R1 (ARM like the BB) I am passing to the kernel the parameters
sunxi_ve_mem_reserve=0 sunxi_g2d_mem_reserve=0 sunxi_fb_mem_reserve=0 console=ttyS1,115200n8
and took out the ones:
Why this parameters:
This eliminates the reserved memory for the video acceleration engine, saving 80MB.
This eliminates the reserved memory for the 2D acceleration engine.
This sets the amount of total reserved memory for the framebuffer to 0.
Since you are not interested in video output, you might also be interested in a BeagleBone Green, a BeagleBone without a HDMI connector.