Allow some constants to be overridden in xinu.conf for very small systems

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Allow some constants to be overridden in xinu.conf for very small systems #10

Closed eblanton closed 6 years ago

eblanton commented 7 years ago

The default sizes for INITSTK, LOOP_BUFFER, UART_IBLEN, UART_OBLEN, and TTY_IBLEN are not appropriate for very small systems (RAM smaller than about 32 kB). This patch allows such systems to define smaller values in xinu.conf.