Specifications

Software Configuration
3–35
Note
The minimum byte-wide socket address window on the Little
Board/486i is 64K bytes. Any devices smaller than 64K bytes will be
visible in the address space at multiple addresses. For instance, a
16K byte device will be “mirrored” at (for instance) D0000h,
D4000h, D8000h, DC000h. The boot PROM code you use must be
intelligent enough to prevent itself from being run multiple times
during the boot process.
To install a LAN boot PROM in byte-wide socket S0, follow these guidelines:
1. Either obtain a preprogrammed boot PROM device, or program a PROM or Flash EPROM with the
boot PROM image. Use a 64K byte device, such as a 27C512, if possible.
2. Jumper byte-wide socket S0 for the device you will be using. Refer to the diagrams in Chapter 2 for
byte-wide socket jumpering.
3. Install the boot PROM device in S0.
4. In SETUP, set socket S0 for 64K bytes at D0000h and select S0 to be enabled at boot time.
Installing Boot PROM Code in the Onboard Flash Device
Ampro supplies a Flash programming utility to program a boot PROM code into the Flash device on the
Little Board/486i. The program is called PGMIBIOS and is supplied on the Utilities diskette that
accompanies the Little Board/486i Development Kit.
To install boot PROM code, follow this procedure:
1. Using SETUP, verify that the onboard video BIOS is shadowed (on SETUP Page 1). It must be
shadowed for this procedure to work properly.
2. Using SETUP, verify that ExBIOS @ CC000 is enabled (on SETUP Page 2).
3. Remove EMM386, HIMEM, and other extended memory managers from your CONFIG.SYS or
AUTOEXEC.BAT files. No extended memory managers can be loaded. (You must reboot the system
for these changes to take effect.)
4. Remove the jumper on W9 to enable programming and install it on W13 to connect +12V
programming power to the target Flash device.
5. Enter the following command on the DOS command line:
PGMIBIOS EXBIOS=filename
where filename is the name of the boot PROM code file. (Frame the command so that DOS
accesses the utility wherever it resides on your system.)
Files are assumed to be in BINARY format. There is no conversion of HEX, ASCII, or other formats.
Leading and trailing spaces around the “=” are not allowed.
PGMIBIOS will display a message indicating when programming is complete.
6. Turn system power off.
7. Remove jumper W13 and install it on jumper W9.