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.
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.
Start with a new document - selecting the +File->New + menu item if necessary to do this.
Choose the +Build->Templates + menu item, and then select the SH EDK7708 hardware.
While still displaying the +Build->Templates + dialog box, select the “stubs” package template +to build a GDB stub. Click +OK.
If building a little-endian image, disable the “Use +big-endian mode” option in the SH EDK7708 HAL (CYGHWR_HAL_SH_BIGENDIAN).
Build eCos using +Build->Library.
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”.
Make an empty directory to contain the build tree, +and cd into it.
To build a GDB stub ROM image, enter the command: + +
$ ecosconfig new edk7708 stubs |
If building a little-endian image, uncomment the user +value in ecos.ecc for CYGHWR_HAL_SH_BIGENDIAN +and change it to 0.
Enter the commands: + +
$ ecosconfig tree +$ make |
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”.
Program the binary image file gdb_module.bin +into ROM or FLASH referring to the instructions of your ROM programmer.
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.