[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>

diff --git a/src/drivers/net/tg3/tg3.h b/src/drivers/net/tg3/tg3.h
index a56d784163833c18ef86ae937845d4a5f308ce48..1913cb166a5d070675a9e26b26e97ed4af3b8c3e 100644 (file)
--- 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)