Ben,
Benjamin Herrenschmidt wrote on 04/19/2016 01:45:40 AM:
> From: Benjamin Herrenschmidt
> To: bruce_leon...@selinc.com, linuxppc-dev@lists.ozlabs.org
> Date: 04/19/2016 01:46 AM
> Subject: Re: Trouble with DMA on PPC linux question
>
> On Mon, 2016-04-18 at 14:54
On Mon, 2016-04-18 at 14:54 -0700, bruce_leon...@selinc.com wrote:
>
> On the DMA transactions that work, the virtual address I hand to
> dma_map_single() is something like 0xe084 and the dma_addr_t result is
> 0x1084 which is less than my 512Mb limit. On the transactions that
> don't
Good afternoon everyone,
We're trying to get some performance gains in an older embedded design by
adding DMA to our NAND driver. The HW is an MPC8349 talking across a PCI
bus to a NAND controller and we have 512Mb of RAM. We're using the 3.18
kernel and the Freescale "fsl,mpc8349-dma" driver
