From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zoltan Kiss <zoltan.kiss@linaro.org>
Subject: dma_map_single returns 0 on ARM
Date: Fri, 24 Oct 2014 17:40:17 +0100
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Hi,

I'm trying to fire up the Ethernet port of a Hisilicon D01 board, and it 
fails when it wants to map the buffers to the device:

		phys = dma_map_single(&ndev->dev, priv->rx_buf[i],
				RX_BUF_SIZE, DMA_FROM_DEVICE);

This returns 0, while running on bare metal it works. Does anyone has an 
advice where should I look?

Regards,

Zoltan