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Boot cmd is configurable:
1. Get boot cmdline:
dd if=/dev/sdX(your external SD card) of=./bootenv.bin bs=1K skip=768 count=128
The 128KB binary file contains:
4 Bytes CRC32 checksum
128KB-4Bytes cmdline data
2. Edit cmdline with hex editor and recalc CRC32 checksum(this is very important)
3.Flash into SD card
dd of=/dev/sdX(your external SD card) if=./bootenv.bin bs=1K seek=768 count=128
sync
sync
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