u-boot/doc/README.nmdk8815
Alessandro Rubini d5254f149d Initial support for Nomadik 8815 development board
The NMDK8815 board is distributed by ST Microelectornics.
Other (proprietary) code must be run to unlock the CPU before
U-Boot runs. doc/README.nmdk8815 outlines the boot sequence.

This is the initial port, with basic infrastructure and
a working serial port.

Signed-off-by: Alessandro Rubini <rubini@unipv.it>
Acked-by: Andrea Gallo <andrea.gallo@stnwireless.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2009-01-24 18:10:37 +01:00

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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.