eCos User Guide
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# SH3/EDK7708 Hardware Setup

The eCos Developer’s Kit package comes with a ROM which provides GDB support for the Hitachi EDK7708 board (a big-endian and a little-endian version). Images of these ROMs are also provided at `loaders/sh-edk7708/gdbload.bin` and `loaders/sh-edk7708le/gdbload.bin` under the root of your eCos installation.

The ROM is installed to socket U6 on the board. When using the big-endian ROM, jumper 9 must be set to 2-3. When using the little-endian ROM, jumper 9 must be set to 1-2. Attention should be paid to the correct orientation of the ROM during installation. Only replace the board"s existing ROM using a proper PLCC extraction tool, as the socket would otherwise risk being damaged.

If you are going to program a new ROM or FLASH using the binary image, you may have to experiment to get the right byte-order in the device. Depending on the programming software you use, it might be necessary to enable byte-swapping. If the GDB stub ROM/FLASH you program does not work, try reversing the byte-order.

The GDB stub in the EPROM allows communication with GDB using the serial port at connector J1. The communication parameters are fixed at 38400 baud, 8 data bits, no parity bit and 1 stop bit (8-N-1). No flow control is employed. Connection to the host computer should be made using the dedicated serial cable included in the EDK package.

## Installing the Stubs into FLASH

### Preparing the Binaries

These two binary preparation steps are not strictly necessary as the eCos distribution ships with pre-compiled binaries in the directory loaders/sh-edk7708 and loaders/sh-edk7708le relative to the installation root.

#### Building the ROM images with the eCos Configuration Tool

1. Start with a new document - selecting the File->New menu item if necessary to do this.

2. Choose the Build->Templates menu item, and then select the SH EDK7708 hardware.

3. While still displaying the Build->Templates dialog box, select the “stubs” package template to build a GDB stub. Click OK.

4. If building a little-endian image, disable the “Use big-endian mode” option in the SH EDK7708 HAL (CYGHWR_HAL_SH_BIGENDIAN).

5. Build eCos using Build->Library.

6. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

#### Building the ROM images with ecosconfig

1. Make an empty directory to contain the build tree, and cd into it.

2. To build a GDB stub ROM image, enter the command:

       $ ecosconfig new edk7708 stubs

3. If building a little-endian image, uncomment the user value in ecos.ecc for CYGHWR_HAL_SH_BIGENDIAN and change it to 0.

4. Enter the commands:

       $ ecosconfig tree
       $ make

5. When the build completes, the image files can be found in the bin/ subdirectory of the install tree. GDB stub ROM images have the prefix “gdb_module”.

### Installing the Stubs into ROM or FLASH

1. Program the binary image file gdb_module.bin into ROM or FLASH referring to the instructions of your ROM programmer.

2. Plug the ROM/FLASH into socket U6. If the image is little-endian set jumper 9 to 1-2. If the image is big-endian set jumper 9 to 2-3.

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