[ecm] Use ACPI-provided system-specific MAC address if present
Use the "system MAC address" provided within the DSDT/SSDT if such an
address is available and has not already been assigned to a network
device.
Tested-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
diff --git a/src/drivers/net/ecm.c b/src/drivers/net/ecm.c
index 9160498..2f784d5 100644
--- a/src/drivers/net/ecm.c
+++ b/src/drivers/net/ecm.c
@@ -30,6 +30,7 @@
#include <ipxe/if_ether.h>
#include <ipxe/base16.h>
#include <ipxe/profile.h>
+#include <ipxe/acpimac.h>
#include <ipxe/usb.h>
#include "ecm.h"
@@ -93,6 +94,14 @@
int len;
int rc;
+ /* Use system-specific MAC address, if present and not already used */
+ if ( ( ( rc = acpi_mac ( hw_addr ) ) == 0 ) &&
+ ! find_netdev_by_ll_addr ( ðernet_protocol, hw_addr ) ) {
+ DBGC ( usb, "USB %s using system-specific MAC %s\n",
+ func->name, eth_ntoa ( hw_addr ) );
+ return 0;
+ }
+
/* Fetch MAC address string */
len = usb_get_string_descriptor ( usb, desc->mac, 0, buf,
sizeof ( buf ) );