FWIW, dtoverlay=vc4-kms-v3d,cma-256 produces:

Mar 13 16:32:11 rpi-3b-plus-rev1d3-abfb kernel: Reserved memory: created CMA 
memory pool at 0x0000000019c00000, size 256 MiB
Mar 13 16:32:11 rpi-3b-plus-rev1d3-abfb kernel: OF: reserved mem: initialized 
node linux,cma, compatible id shared-dma-pool
Mar 13 16:32:11 rpi-3b-plus-rev1d3-abfb kernel: OF: reserved mem: 
0x0000000019c00000..0x0000000029bfffff (262144 KiB) map reusable linux,cma

Whereas dtoverlay=vc4-kms-v3d + cma=256M (commandline) results in:

Mar 13 16:32:23 rpi-3b-plus-rev1d3-abfb kernel: OF: reserved mem: Skipping dt 
linux,cma-default for "cma=" kernel param.
Mar 13 16:32:23 rpi-3b-plus-rev1d3-abfb kernel: cma: Reserved 256 MiB at 
0x0000000019c00000

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https://bugs.launchpad.net/bugs/2146871

Title:
  Boot failure on Pi 3B+

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