From: Fabio Estevam fabio.estevam@freescale.com

Performing tftp transfers on mx28 results in random timeouts.

Hector Palacios and Robert Hodaszi analyzed the root cause being related to the wrong alignment of the 'buff' buffer inside fec_recv().

Benoît Thébaudeau provided an excellent analysis of the alignment bug that is present on older versions, such as GCC 4.5.4:

http://marc.info/?l=u-boot&m=137942904906131&w=2

Use ALLOC_CACHE_ALIGN_BUFFER() to avoid alignment issues from older GCC versions.

Reported-by: Hector Palacios hector.palacios@digi.com Tested-by: Oliver Metz oliver@freetz.org Tested-by: Hector Palacios hector.palacios@digi.com Signed-off-by: Fabio Estevam fabio.estevam@freescale.com --- Changes since v1: - Improve commit log - Add Hector's Tested-by tag

drivers/net/fec_mxc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c index 690e572..b423ff6 100644 --- a/drivers/net/fec_mxc.c +++ b/drivers/net/fec_mxc.c @@ -794,7 +794,7 @@ static int fec_recv(struct eth_device *dev) uint16_t bd_status; uint32_t addr, size, end; int i; - uchar buff[FEC_MAX_PKT_SIZE] __aligned(ARCH_DMA_MINALIGN); + ALLOC_CACHE_ALIGN_BUFFER(uchar, buff, FEC_MAX_PKT_SIZE);

/* * Check if any critical events have happened