[U-Boot] [PATCH 4/4]: arm: Kirkwood: See to it that sent data is 8-byte aligned

[Ben Warren <biggerbadderben@gmail.com>]

Simon,

Simon Kagstrom wrote:
> U-boot might use non-8-byte-aligned addresses for sending data, which
> the kwgbe_send doesn't accept (bootp does this for me). This patch
> copies the data to be sent to a temporary buffer if it is non-aligned.
>
> Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
> ---
>  drivers/net/kirkwood_egiga.c |   26 ++++++++++++++++++++------
>  1 files changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/kirkwood_egiga.c b/drivers/net/kirkwood_egiga.c
> index 537343f..24269c1 100644
> --- a/drivers/net/kirkwood_egiga.c
> +++ b/drivers/net/kirkwood_egiga.c
> @@ -481,7 +481,7 @@ static int kwgbe_halt(struct eth_device *dev)
>  	return 0;
>  }
>  
> -static int kwgbe_send(struct eth_device *dev, volatile void *dataptr,
> +static int kwgbe_send_aligned(struct eth_device *dev, volatile void *dataptr,
>  		      int datasize)
>  {
>  	struct kwgbe_device *dkwgbe = to_dkwgbe(dev);
> @@ -489,11 +489,6 @@ static int kwgbe_send(struct eth_device *dev, volatile void *dataptr,
>  	struct kwgbe_txdesc *p_txdesc = dkwgbe->p_txdesc;
>  	u32 cmd_sts;
>  
> -	if ((u32) dataptr & 0x07) {
> -		printf("Err..(%s) xmit dataptr not 64bit aligned\n",
> -			__FUNCTION__);
> -		return -1;
> -	}
>  	p_txdesc->cmd_sts = KWGBE_ZERO_PADDING | KWGBE_GEN_CRC;
>  	p_txdesc->cmd_sts |= KWGBE_TX_FIRST_DESC | KWGBE_TX_LAST_DESC;
>  	p_txdesc->cmd_sts |= KWGBE_BUFFER_OWNED_BY_DMA;
> @@ -522,6 +517,25 @@ static int kwgbe_send(struct eth_device *dev, volatile void *dataptr,
>  	return 0;
>  }
>  
> +static int kwgbe_send(struct eth_device *dev, volatile void *dataptr,
> +		      int datasize)
> +{
> +	static u8 __attribute__((aligned(8))) aligned_buf[9000];
>   
Why do you need to send a jumbo frame?  U-boot is hard-coded in some 
ways to only handle frames with an MTU of 1518 bytes on Rx.

regards,
Ben