> boot.scr is only relevant when booting via U-Boot. In this case
/boot/firmware/cmdline.txt is not considered.

I don't think that's entirely correct. The Pi firmware loads the options
from /boot/firmware/cmdline.txt and patches the in-memory DT (I believe)
from which u-boot gets the chosen args and then appends 'quiet splash'
to that:

U-Boot> fdt addr ${fdt_addr}
U-Boot> fdt move ${fdt_addr} ${fdt_addr_r}
U-Boot> fdt get value bootargs /chosen bootargs
U-Boot> env print bootargs
bootargs=coherent_pool=1M snd_bcm2835.enable_compat_alsa=0 
snd_bcm2835.enable_hdmi=1 
video=Composite-1:720x480@60i,margin_left=32,margin_right=32,margin_top=32,margin_bottom=32
 smsc95xx.macaddr=B8:27:EB:97:40:CC vc_mem.mem_base=0x3ec00000 
vc_mem.mem_size=0x40000000  dwc_otg.lpm_enable=0 elevator=deadline 
rng_core.default_quality=700 vt.handoff=2 console=tty1 console=ttyAMA0,115200 
ignore_loglevel

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https://bugs.launchpad.net/bugs/2073835

Title:
  Default kernel commandline options on Raspberry Pi

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