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Bootloader for LPC1766 - starting the program

I'm working on a bootloader that uses a hex file and I would like to know, how to start loaded program.

In Keil v. 4.24 startup.s file contained this:

Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  __main
                LDR     R0, =__main
                BX      R0
                ENDP

And __main function was an entry point for any program. Keil generated hex-file and __main-function address was here as "Linear start address". All was well.

But Keil's 4.5 (or higher) startup.s containes this:

Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  SystemInit
                IMPORT  __main
                LDR     R0, =SystemInit
                BLX     R0
                LDR     R0, =__main
                BX      R0
                ENDP

So what is an entry point now? And where does "linear start address" point to?
Is there some reliable way to start loaded program based on information in the hex file?

Moving SystemInit call from reset handler to the actual main is obvious, but a little bit inconvinient.