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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. 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_LocateCapability