I have spent a fair amount of time searching through the usual archives and repo databases, but most links I've found are either dead, corrupted, or actually lead to the later 256KB "Complex" or "Xecuter" BIOS files rather than the raw Mcpx dump.
Some dumps of mcpx-1.0.bin contain debug leftovers (e.g., DEBUG_MODE=1 at offset 0x1C ). Although masked in production silicon, early devkit versions allowed indefinite booting from unencrypted NAND. Mcpx-1.0.bin Bios
: Its primary role is to initialize hardware, decrypt the second bootloader (2BL) from the Flash ROM (BIOS), and transfer control to it. I have spent a fair amount of time