UM0851 datasheet(14/245 Pages) STMICROELECTRONICS

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Boot loader overview

UM0851

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Doc ID 16604 Rev 2

settings required for different DDR memory hardware and routing. Please refer to one of the

following application notes for more information on MPMC configuration:

●

AN3100, Configuring the SPEAr3xx multi-port memory controller (MPMC) for external

DDR SDRAM

●

AN3132, Configuring the SPEAr600 multi-port memory controller (MPMC) for external

DDR SDRAM.

1.1.1

Building XLoader

To build XLoader, you need to use the STLinux toolchain and run the following commands:

/* Build XLoader for SPEAr600 target with DDR@333MHz for size 128MB*/

# make SOC=SPR600 DDRFREQ=333 DDRSIZE=128M

/* Build XLoader for SPEAr300 target with DDR@333MHz for size 128MB*/

# make SOC=SPR300 DDRFREQ=333 DDRSIZE=128M

/* Build XLoader which could be used as a firmware for initializing

* DDR with USB Flashing utility

# make SOC=SPR600 DDRFREQ=166 DDRSIZE=128M CONSOLE=USB

/* Build XLoader for all platform and all types (normal XLoader

* and Flashing utility firmware

# ./makeall

The XLoader source can be compiled with various options, which are listed below:

●

make SOC=SPR300: This option generates XLoader for the requested platform. Other

platform options can be SPR600, SPR310 and SPR320.

●

make DDRFREQ=333: This option generates XLoader binary image with DDR driver

that supports 333 MHz operation. To generate XLoader for DDR @166 MHZ pass

DDRFREQ=166. This option is available for SPEAr3XX and SPEAr600

●

make DDRSIZE=128M: This option generates XLoader for DDR size of 128 MB. An

other possible parameter can be 64 M to generate 64 MB XLoader.

●

make CONSOLE=USB: This option generates XLoader which is used as a firmware to

initialize DDR in USB flashing utility.

●

make DDRFREQ=333 DDRCONF=ASYNC: This option generates XLoader to

configure DDR @333 MHz asynchronoulsy, for example the DDR is driven through the

clock from PLL2 rather than PLL1 (synchronous operation). This option only works for

DDR @333 MHz. This XLoader can be used with some features of Linux Power

Management (like CPU-Freq) which currently guarantees only the system stability with

asynchronous DDR operation.

1.2

U-Boot

Das U-Boot is an open source boot monitor available for a wide range of embedded

processors architectures. A boot monitor is a small piece of software that executes after

powering up an embedded system. It can be used to achieve the following objectives:

●

Monitor the system for develop/debug purpose

●

Boot an OS

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