NAME

ReadExpansionRom: read a boards configuration ROM space

SYNOPSIS

error = ReadExpansionRom( board, configDev )
D0 A0 A1

FUNCTION

(Not typically called by user code)

ReadExpansionRom reads a the ROM portion of an expansion device in to cd_Rom portion of a ConfigDev structure. This routine knows how to detect whether or not there is actually a board there,

In addition, the ROM portion of a new style expansion board is encoded in ones-complement format (except for the first two nybbles, the er_Type field). ReadExpansionRom knows about this and un-complements the appropriate fields.

INPUTS

board: a pointer to the base of a new style expansion board.
configDev: the ConfigDev structure that will be read in.
offset: a logical offset from the configdev base

RESULT

error: If the board address does not contain a valid new style expansion board, then error will be non-zero.

EXAMPLE

configDev = AllocConfigDev();
if( ! configDev ) panic();

error = ReadExpansionBoard( board, configDev );
if( ! error ) {

configDev->cd_BoardAddr = board;
ConfigBoard( configDev );