pci_write_config8()

Write bytes to the configuration space of a PCI device

Synopsis:

#include <hw/pci.h>

int pci_write_config8( unsigned bus,
                       unsigned dev_func,
                       unsigned offset,
                       unsigned count,
                       char* buff );

Arguments:

bus: The bus number.
dev_func: The device or function ID. The device number is in bits 7 through 3, and the function number in bits 2 through 0.
offset: The register offset into the configuration space, in the range [0...255].
count: The number of bytes to write.
buff: A pointer to a buffer containing the data to be written into the configuration space.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pci_write_config8() function writes individual bytes to the configuration space of the specified device. For the details of the configuration space, see the _pci_config_regs structure in <hw/pci.h>.

Note: You must successfully call pci_attach() before calling any of the other PCI functions.

Returns:

PCI_BAD_REGISTER_NUMBER: An invalid offset register number was given.
PCI_BUFFER_TOO_SMALL: The size argument is greater than 100 bytes.
PCI_SUCCESS: The device or function was found.
-1: You haven't called pci_attach(), or the call to it failed.

Classification:

QNX Neutrino

Safety:
Cancellation point	Yes
Interrupt handler	No
Signal handler	Yes
Thread	Yes