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18 21555 PCI-to-PCI Bridge Evaluation Board User’s Guide
Operations and Installation
• MSKROM.EXE an executable utility for programming the SROM.
• The software diskettes are standard 3.5 inch floppy disks. Follow the installation procedure
printed on the inside of the shipping package. Be certain that the target system meets the
minimum system requirements.
2.3.1 Programming the SROM
To program the SROM on the DE1B55503, use the MKSROM.EXE utility. Use a text editor to
create an ASCII data file.
To program a blank SROM:
1. Set SW1 and SW2 to “down” during initialization of the system.
2. After the system initializes, toggle SW1 to “up”.
3. Use the MKSROM.EXE utility. For example:
mksrom.exe sromfile.dat
4. Set SW2 to “up” position and reboot system.
Table 7 shows the two SROM enable and lockout switches.
2.3.2 Programming the Flash ROM
Dbflash.exe is an MSDOS based program that allows the flash ROM attached to the 21555 to be
erased and updated with new images. When dbflash.exe is run on a system that has a 21555
installed on the PCI bus, the program will scan all the PCI buses looking for the 21555 component.
When found, the program will identify the 21555’s PCI location and start the update process that
was selected on the command line.
MSKSROM file.dat
Where: MSKROM Executes the MSKROM utility.
file.dat Specifies the file to load into the SROM.
Table 7. Switch Operation for SROM programming
Switch
Pack
Switch
Switch
Down
Switch Up Description
J20
SW1
SROM
Output
disabled
SROM
Output
enabled
The initialization is read from the SROM on
pr_ad<2>:sr_do
SW2
No lockout
(debug)
Lockout
(normal
operation)
Controls the primary lockout bit Reset Value on pr_ad<3>