eCosPro® Reference Manual
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# Setup

## Name

Setup -- Preparing the AT91SAM9261-EK board for eCos Development

## Overview

In a typical development environment, the AT91SAM9261-EK board boots from the DataFlash and run the RedBoot ROM monitor from SDRAM. eCos applications are configured for RAM startup and then downloaded and run on the board via the debugger arm-eabi-gdb. Preparing the board therefore usually involves programming a suitable RedBoot image into flash memory.

The following RedBoot configurations are supported:

Configuration | Description | Use | File
--- | --- | --- | ---
ROM | RedBoot loaded from Dataflash to SDRAM | redboot_ROM.ecm | redboot_ROM.bin

For serial communications, all versions run with 8 bits, no parity, and 1 stop bit at 115200 baud. RedBoot also supports ethernet communication and flash management.

Note that the use of the term ROM for the initial RedBoot configuration is an historical accident. RedBoot actually runs from SDRAM after being loaded there from Dataflash by the second-level bootstrap. The use of ROM for this configuration is intended to indicate that it initializes the microprocessor and board peripherals, as opposed to the RAM configuration which assumes that this has already been done.

## Initial Installation

The on-chip boot program on the AT91SAM9261 is only capable of loading programs from Dataflash or NAND flash into on-chip SRAM and is therefore quite restrictive. Consequently RedBoot cannot be booted directly and a second-level bootstrap must be used. Such a second-level bootstrap is supplied by Atmel in the form of AT91Bootstrap. This is therefore programmed into the start of Dataflash and is then responsible for initializing the SDRAM and loading RedBoot from Dataflash and executing it.

Caution
There is a size limit on the size of applications which the AT91Bootstrap second level bootstrap will load. Images larger than 320Kbytes will require the AT91Bootstrap application to be rebuilt with a larger IMG_SIZE definition in `AT91Bootstrap/board/at91sam9261ek/dataflash/at91sam9261ek.h` within the sam9260ek HAL package in the eCos source repository (`packages/hal/arm/arm9/sam9260ek/VERSION/`).

There are basically two ways to write the second-level bootstrap and RedBoot to the Dataflash. The first is to use the Atmel-supplied SAM-BA program that interacts with the on-chip boot program. The second is to use a JTAG debugger that understands the microcontroller and can write to the dataflash (for example the Ronetix PEEDI). Since the availability of the latter cannot be guaranteed, only the first method will be described here.

### Programming RedBoot into DataFlash using SAM-BA

The following gives the steps needed to program the second-level bootstrap and RedBoot into the DataFlash using SAM-BA. The user should refer to the SAM-BA documentation for full details of how to run the program.

1. Download the AT91 In-system Programmer sofware package from the Atmel website. Install it on a suitable PC running Windows XP.

2. Copy `dataflash_at91sam9261ek.bin` and `redboot_ROM.bin` to a suitable location on the Windows PC.

3. Connect a null-modem serial cable between the DEBUG serial port of the board and a serial port on a convenient host (which need not be the PC running SAM-BA). Run a terminal emulator (Hyperterm or minicom) at 115200 baud. Connect a USB cable between the PC and the AT91SAM9261-EK board.

4. Power up or reset the board and Windows should recognize the USB device. If it does not, then move J21 to the 2-3 position and reset the board, it should be recognized now. Windows may ask you to install a new driver, in which case follow the instructions.

5. Start SAM-BA. Select "\usb\ARM0" for the communication interface, and "AT91SAM9261-EK" for the board. If the USB option does not appear, check the cable and look in the Windows Device Manager for the active device. If all is well, click on "Connect".

6. If you moved J21 to 2-3, move it back to the default 1-2 position.

7. In the SAM-BA main window, select the "DataFlash AT45DB/DBC" tab and in the "Scripts" dropdown menu select "Enable Dataflash (SPI0 CS0)", to program the on-board Dataflash device. Click Execute and SAM-BA should emit the following in the message area:

       (AT91-ISP v1.13) 1 % DATAFLASH::Init 0
       -I- DATAFLASH::Init 0 (trace level : 4)
       -I- Loading applet isp-dataflash-at91sam9261.bin at address 0x20000000
       -I- Memory Size : 0x840000 bytes
       -I- Buffer address : 0x20002A40
       -I- Buffer size: 0x80E80 bytes
       -I- Applet initialization done

8. Select "Send BootFile" from the "Scripts" menu and "Execute" it. When the file open dialog appears, select the `dataflash_at91sam9261ek.bin` file and click "Open". The following output should be seen:

       (AT91-ISP v1.13) 1 % GENERIC::SendBootFileGUI
       GENERIC::SendFile dataflash_at91sam9261ek.bin at address 0x0
       -I- File size : 0x10A2 byte(s)
       -I- 	Writing: 0x10A2 bytes at 0x0 (buffer addr : 0x20002A40)
       -I- 	0x10A2 bytes written by applet

9. The second-level bootstrap has now been written to DataFlash, we must now write RedBoot.

10. In the "Send File Name" box type in the path name to the `redboot_ROM.bin` file, or use the Open Folder button and browse to it.

11. In the Address field set the value to 0x8400.

12. Click the "Send File" button. SAM-BA will put up a dialog box while it is writing the file to the DataFlash, and will output something similar to the following in the message area:

        (AT91-ISP v1.13) 1 % send_file {DataFlash AT45DB/DCB} "redboot_ROM.bin" 0x8400 0
        -I- Send File //bert/Shared/Releng/sam9261ek/redboot_ROM.bin at address 0x8400
        GENERIC::SendFile //bert/Shared/Releng/sam9261ek/redboot_ROM.bin at address 0x8400
        -I- File size : 0x1F928 byte(s)
        -I- 	Writing: 0x1F928 bytes at 0x8400 (buffer addr : 0x20002A40)
        -I- 	0x1F928 bytes written by applet

13. Shut down SAM-BA and disconnect the USB cable. Press the reset button on the board and something similar to the following should be output on the DEBUG serial line.

        RomBOOT
        >Start AT91Bootstrap...
        +**Warning** FLASH configuration checksum error or invalid key
        Use 'fconfig -i' to [re]initialize database
        >Start AT91Bootstrap...
        No network interfaces found

        RedBoot(tm) bootstrap and debug environment [ROM]
        eCosCentric certified release, version v3_0_3 - built 12:53:09, Sep 24 2009

        Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
        Free Software Foundation, Inc.
        Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 eCosCentric Limited
        RedBoot is free software, covered by the eCos license, derived from the
        GNU General Public License. You are welcome to change it and/or distribute
        copies of it under certain conditions. Under the license terms, RedBoot's
        source code and full license terms must have been made available to you.
        Redboot comes with ABSOLUTELY NO WARRANTY.

        Platform: SAM9261-EK (ARM9)
        RAM: 0x20000000-0x24000000 [0x20031230-0x23ffef80 available]
        FLASH: 0x40000000-0x4083ffff, 8192 x 0x420 blocks
        RedBoot>

### RedBoot Flash configuration

The following steps describe how to initialize RedBoot's Flash configuration.

1. Use the following command to initialize RedBoot's Flash Information System (FIS):

       RedBoot> fis init
       About to initialize [format] FLASH image system - continue (y/n)? y
       *** Initialize FLASH Image System
       ... Erase from 0x4083fbe0-0x4083ffff: .
       ... Program from 0x23fffbe0-0x24000000 to 0x4083fbe0: .
       RedBoot> fis list
       Name              FLASH addr  Mem addr    Length      Entry point
       (reserved)        0x40000000  0x40000000  0x00008000  0x00000000
       RedBoot           0x40008000  0x40008000  0x00028380  0x00000000
       RedBoot config    0x4083F7C0  0x4083F7C0  0x00000420  0x00000000
       FIS directory     0x4083FBE0  0x4083FBE0  0x00000420  0x00000000
       RedBoot>

2. Now configure RedBoot's Flash configuration with the command:

       RedBoot> fconfig -i

   Remember to substitute the appropriate MAC address for this board at the appropriate step. If a BOOTP/DHCP server is not available, then IP configuration may be set manually. The default server IP address can be set to a PC that will act as a TFTP host for future RedBoot load operations, or may be left unset. The following gives an example configuration:

       RedBoot> fconfig -i
       Initialize non-volatile configuration - continue (y/n)? y
       Run script at boot: false
       Use BOOTP for network configuration: false
       Gateway IP address: 192.168.7.11
       Local IP address: 192.168.7.222
       Local IP address mask: 255.255.255.0
       Default server IP address: 192.168.7.9
       Console baud rate: 115200
       DNS server IP address: 192.168.7.11
       Network hardware address [MAC]: 0x00:0x23:0x31:0x37:0x00:0x4e
       GDB connection port: 9000
       Force console for special debug messages: false
       Update RedBoot non-volatile configuration - continue (y/n)? y
       ... Erase from 0x4083f7c0-0x4083fbdf: .
       ... Program from 0x23fff7c0-0x23fffbe0 to 0x4083f7c0: .
       RedBoot>

The RedBoot installation is now complete. This can be tested by powering off the board, and then powering on the board again. Output similar to the following should be seen on the DEBUG serial port. Verify the IP settings are as expected.

    RomBOOT
    >Start AT91Bootstrap...
    +Ethernet eth0: MAC address 00:03:47:df:32:a8
    IP: 192.168.7.85/255.255.255.0, Gateway: 192.168.7.11
    Default server: 192.168.7.11
    DNS server IP: 192.168.7.11, DNS domain name: <null%gt;

    RedBoot(tm) bootstrap and debug environment [ROM]
    eCosCentric certified release, version v3_0_3 - built 12:53:09, Sep 24 2009

    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
    Free Software Foundation, Inc.
    Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 eCosCentric Limited
    RedBoot is free software, covered by the eCos license, derived from the
    GNU General Public License. You are welcome to change it and/or distribute
    copies of it under certain conditions. Under the license terms, RedBoot's
    source code and full license terms must have been made available to you.
    Redboot comes with ABSOLUTELY NO WARRANTY.

    Platform: SAM9261-EK (ARM9)
    RAM: 0x20000000-0x24000000 [0x20031230-0x23ffef80 available]
    FLASH: 0x40000000-0x4083ffff, 8192 x 0x420 blocks
    RedBoot>

If it proves necessary to re-install RedBoot, this may be achieved by repeating the above process. Alternatively, a new image may be downloaded and programmed into flash more directly using RedBoot's own commands. See the RedBoot documentation for details.

## Rebuilding RedBoot

Should it prove necessary to rebuild a RedBoot binary, this is done most conveniently at the command line. The steps needed to rebuild the ROM version of RedBoot for the AT91SAM9261-EK are:

    $ mkdir redboot_at91sam9261ek_rom
    $ cd redboot_at91sam9261ek_rom
    $ ecosconfig new at91sam9261ek redboot
    $ ecosconfig import $ECOS_REPOSITORY/hal/arm/arm9/sam9261ek/VERSION/misc/redboot_ROM.ecm
    $ ecosconfig resolve
    $ ecosconfig tree
    $ make

At the end of the build the `install/bin` subdirectory should contain the file `redboot.bin`.

## Rebuilding AT91Bootstrap

The sources of AT91Bootstrap are found in the `AT91Bootstrap` directory of the sam9260ek package. This is a copy of the software as supplied by Atmel with some slight modifications to permit it to be built with the same tools as eCos.

To rebuild the second-level bootstrap for the AT91SAM9261EK execute the following commands:

    $ cd $ECOS_REPOSITORY/hal/arm/arm9/sam9260ek/VERSION/AT91Bootstrap/board/at91sam9261ek/dataflash
    $ make

This should result in the creation of a number of files, including `dataflash_at91sam9261ek.bin` which can be copied out.

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