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-NAME="HAL-DIAGNOSTIC-SUPPORT">Diagnostic Support</H1
-><P
->The HAL provides support for low level diagnostic IO. This is
-particularly useful during early development as an aid to bringing up
-a new platform. Usually this diagnostic channel is a UART or some
-other serial IO device, but it may equally be a a memory
-buffer, a simulator supported output channel, a ROM emulator virtual
-UART, and LCD panel, a memory mapped video buffer or any other output
-device.</P
-><P
-><TT
-CLASS="FUNCTION"
->HAL_DIAG_INIT()</TT
-> performs any initialization
-required on the device being used to generate diagnostic output. This
-may include, for a UART, setting baud rate, and stop, parity and
-character bits. For other devices it may include initializing a
-controller or establishing contact with a remote device.</P
-><P
-><TT
-CLASS="FUNCTION"
->HAL_DIAG_WRITE_CHAR(c)</TT
-> writes
-the character supplied to the diagnostic output device.</P
-><P
-><TT
-CLASS="FUNCTION"
->HAL_DIAG_READ_CHAR(c)</TT
-> reads a character from the
-diagnostic device into the supplied variable. This is not supported
-for all diagnostic devices.</P
-><P
->These macros are defined in the header file
-<TT
-CLASS="FILENAME"
->cyg/hal/hal_diag.h</TT
->. This file is usually supplied
-by the variant or platform HAL, depending on where the IO device being
-used is located. For example for on-chip UARTs it would be in the
-variant HAL, but for a board-level LCD panel it would be in the
-platform HAL.</P
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