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The legacy chips like rk3188 maskrom require all IDB data with RC4, the boot_merger pack the loader with a rc4 flag in header, and the upgrade_tool will write the data with rc4 to IDB area. usage: boot_merger --rc4 RKBOOT/RK310BMINIALL.ini and you can see log below if success with RC4: * enable RC4 for IDB data(both ddr and preloader) Test on rk3188. Change-Id: If221a32a462bb43bef67aae802adff5e1e8436ac Signed-off-by: Joseph Chen <chenjh@rock-chips.com>