using the bootstrap loader

7.1 INTRODUCTION
ERROR HANDLING 7
If the bootstrap loading process is unsuccessful, the Bootstrap Loader initiates errorhandling
procedures. Notification of failures occurring during the loading process depends
on the configuration of the first and third stages. This chapter describes the Bootstrap
Loader's error handling facilities.
7.2 ANALVZING BOOTSTRAP LOADER FAILURES
The Bootstrap Loader can display messages at the terminal when bootstrap loading is
unsuccessful. As discussed in Chapter 3, the %CONSOLE, %TEXT, and %LIST macros
in the BSERR.A86 file determine if messages are displayed when errors occur during the
first and second stages, how detailed the messages are, and under what circumstances they
are displayed. As Chapter 4 explains, the third stage automatically determines if a monitor
is present, and if so, displays error messages at the terminal regardless of the first stage
configuration.
The following sections describe what happens when a bootstrap loading error occurs and
how to analyze the error. There are two situations described: error analysis when messages
are displayed, and error analysis when no messages are displayed.
7.2.1 Actions Taken by the Bootstrap Loader After an Error
After responding to an error by pushing a word onto the stack and optionally displaying a
message, the Bootstrap Loader either tries again, passes control to a monitor, or halts. If
the error is detected in the first or second stage, the action taken depends on whether your
BSERR.A86 file contains an %AGAIN, %INTl, %INTI, or %HALT macro. If the error
is detected in the third stage, the action taken depends on whether your third stage
configuration file contains an %INTl, %INTI, or %HALT macro.
Bootstrap Loader 7-1