The Nomadik 8815 CPU has a "secure" boot mode where no external access (not even JTAG) is allowed. The "remap" bits in the evaluation board are configured in order to boot from the internal ROM memory (in secure mode). The boot process as defined by the manufacturer executes external code (loaded from NAND or OneNAND) that that disables such "security" in order to run u-boot and later the kernel without constraints. Such code is a proprietary initial boot loader, called "X-Loader" (in case anyone wonders, it has no relations with other loaders with the same name and there is no GPL code inside the ST X-Loader). SDRAM configuration, PLL setup and initial loading from NAND is implemented in the X-Loader, so U-Boot is already running in SDRAM when control is handed over to it. On www.st.com/nomadik and on www.stnwireless.com there are documents, summary data and white papers on Nomadik. The full datasheet for STn8815 is not currently available on line but under specific request to the local ST sales offices.