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-rw-r--r--sys/dev/gem/if_gem_pci.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/sys/dev/gem/if_gem_pci.c b/sys/dev/gem/if_gem_pci.c
index 05be323..051dbcc 100644
--- a/sys/dev/gem/if_gem_pci.c
+++ b/sys/dev/gem/if_gem_pci.c
@@ -295,6 +295,16 @@ gem_pci_attach(device_t dev)
GEM_PCI_ROM_OFFSET + j + PCI_VPDRES_LARGE_SIZE + PCI_VPD_SIZE,
sc->sc_enaddr, ETHER_ADDR_LEN);
#endif
+ /*
+ * The Xserve G5 has a fake GMAC with an all-zero MAC address.
+ * Check for this, and don't attach in this case.
+ */
+
+ for (i = 0; i < ETHER_ADDR_LEN && sc->sc_enaddr[i] == 0; i++) {}
+ if (i == ETHER_ADDR_LEN) {
+ device_printf(dev, "invalid MAC address\n");
+ goto fail;
+ }
if (gem_attach(sc) != 0) {
device_printf(dev, "could not be attached\n");
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