CSR21              81 drivers/net/ethernet/amd/ariadne.h #define CSR21		0x1500	/*   Current Transmit Buffer Address */
CSR21             265 drivers/net/wireless/ralink/rt2x00/rt2400pci.h #define CSR21				0x0054
CSR21             342 drivers/net/wireless/ralink/rt2x00/rt2500pci.h #define CSR21				0x0054