The packets which a controller module expects to be given vary from controller to controller. The disk driver module for the particular hardware module (board) must take the standardized packet given to a trap function and create a new packet which is specifically tailored for the disk drive controller it is sent to. Refer to documentation on the particular controller module for the format of its packets, and for using the IOC command.
187Bug initializes the parameter tables for a default configuration of controllers and devices (refer to Appendix B). If the system needs to be configured differently than this default configuration (for example, to use a 70MB Winchester drive where the default is a 40MB Winchester drive), then these tables must be changed.
The configuration area of the disk
is read and the parameters corresponding to that device are rewritten according to the parameter information contained in the configuration area.You can use this command to reconfigure the parameter table manually for any controller and/or device that is different from the default In the source code, you may change the permanent configuration files and rebuild 187Bug so that it has different defaults.187Bug returns an error code if an attempted disk operation is unsuccessful.
Network I/O Support
The Network Boot Firmware provides the capability to boot the CPU through the ROM debugger using a network (local Ethernet interface) as the boot device. The booting process is executed in two distinct phases. ❏ The first phase allows the diskless remote node to discover its network identify and the name of the file to be booted.
❏ The second phase has the diskless remote node reading the boot file across the network into its memory. The various modules and the dependencies of these modules that support the overall network boot function are described in the following paragraphs.
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