[tg3] Fix excessive DMA alignment.

Change the DMA alignment from 4096 bytes to 16 bytes, to conserve available DMA memory. The hardware doesn't have any specific alignment requirements. Signed-off-by: Thomas Miletich <thomas.miletich@gmail.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
ipxe · Jul 24, 2012 · ced1493 · ced1493
1 parent 183a70e
commit ced1493
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/src/drivers/net/tg3/tg3.h b/src/drivers/net/tg3/tg3.h
@@ -3277,8 +3277,7 @@ struct tg3 {
 #define TG3_TX_RING_SIZE		512
 #define TG3_DEF_TX_RING_PENDING		(TG3_TX_RING_SIZE - 1)
 
-/* FIXME: look up alignment requirement in datasheet, page align for now */
-#define	TG3_DMA_ALIGNMENT	4096
+#define	TG3_DMA_ALIGNMENT	16
 
 #define TG3_RX_STD_DMA_SZ		(1536 + 64 + 2)