[ipxe-devel] [PATCH] [tg3] Fix excessive DMA alignment.

[Thomas Miletich]

Change the DMA alignment from 4096 bytes to 16 bytes, to conserve available DMA memory. The hardware doesn't have any specifiy alignment requirements.

Signed-off-by: Thomas Miletich<thomas.miletich at gmail.com>
---
 src/drivers/net/tg3/tg3.h |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/drivers/net/tg3/tg3.h b/src/drivers/net/tg3/tg3.h
index a56d784..1913cb1 100644
--- 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)
 
-- 
1.7.9.5