From d5254f149da9e6cd649d887b042ce577ef3ba78d Mon Sep 17 00:00:00 2001 From: Alessandro Rubini Date: Sat, 24 Jan 2009 18:10:37 +0100 Subject: 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 Acked-by: Andrea Gallo Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- doc/README.nmdk8815 | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 doc/README.nmdk8815 (limited to 'doc') diff --git a/doc/README.nmdk8815 b/doc/README.nmdk8815 new file mode 100644 index 000000000..453cfaeab --- /dev/null +++ b/doc/README.nmdk8815 @@ -0,0 +1,22 @@ + +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. -- cgit v1.2.3