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Function RTT_BIOS_WriteConfigData

This function allows writing individual bytes, words, or dwords into the configuration space of a specific device:

int RTT_BIOS_WriteConfigData(BYTE  Bus, 
                             BYTE  DeviceFunc, 
                             int   Register, 
                             int   Width, 
                             DWORD Value);

Parameters

Bus

Bus number to write to.

DeviceFunc

Device number in bits 7 .. 3 and the function number in bits 2 .. 0 for the device to write to.

Register

Register to write to. Must be divisible by Width and cannot be larger than 255. If the function succeeds, the read data is returned at *Value.

Width

May be 1, 2, or 4 for byte, word or dword access.

Value

The data to write to the device.

return value

RTT_BIOS_SUCCESSFUL or an error code, see section PCI BIOS.

PCI BIOS

Function RTT_BIOS_ReadConfigData

Function RTT_BIOS_Rescan