RAM 6.0 BUX II Series Betriebsanweisung PDF herunterladen (Seite 45)

2 Overview of a BSP

2.3 Components of a BSP

supported, this routine returns a pointer to a statically allocated structure. The

following is a sample for a generic BSP supporting exactly two serial devices:

LOCAL SIO_CHAN boardSccChan1;

LOCAL SIO_CHAN boardSccChan2;

/****************************************************************************

* sysSerialChanGet - get the SIO_CHAN device associated with a serial channel

* This routine gets the SIO_CHAN device associated with a specified serial

* channel.

* RETURNS: A pointer to the SIO_CHAN structure for the channel, or ERROR

* if the channel is invalid.

SIO_CHAN * sysSerialChanGet

(

int channel /* serial channel */

)

{

if (channel == 0)

return ((SIO_CHAN *) &boardSccChan1);

else if (channel == 1)

return ((SIO_CHAN *) &boardSccChan2);

else

return ((SIO_CHAN *) ERROR);

}

sysToMonitor( )

The sysToMonitor( ) routine in sysLib.c is called to reboot the system when ctrl+X

is pressed on the console keyboard or, on some systems, when certain processor

errors occur at interrupt level. When sysToMonitor( ) hands control over to the

boot monitor, the system must be set to a state where no interrupts occur; failure

to do this causes the reboot to fail. The following template can be used as a starting

point. However, the

TO BE DONE sections must be replaced by code that performs

the stated operations.

/****************************************************************************

* sysToMonitor - transfer control to the ROM monitor

* This routine transfers control to the ROM monitor. Normally, it is called

* only by reboot()--which services ^X--and bus errors at interrupt level.

* However, in some circumstances, the user may wish to introduce a

* <startType> to enable special boot ROM facilities.

* RETURNS: Does not return.

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RAM 6.0 BUX II Series Betriebsanweisung Seite 45