Re: [PATCH v3 4/7] of: configure the platform device dma parameters

Linus Walleij
2014-05-29T14:01:31Z

On Wed, May 28, 2014 at 4:04 PM, Santosh Shilimkar
<santosh.shilimkar@ti.com> wrote:
> On Wednesday 28 May 2014 09:32 AM, Linus Walleij wrote:

>>> I suspect what you want is
>>>
>>> dma-ranges = <0x80000000 0 0x80000000>;
>>>
>>> to translate dma_addr_t 0x80000000-0xffffffff to phys_addr_t 0x0-0x7fffffff
>>> rather than phys_addr_t 0x800000000-0x87fffffff.
>>
> Interesting. Where does the ROM address space resides on integrator then considering
> address 0 is used for DMA.

The ROM is at physical address 0x20000000, don't ask me
why :-)

The RAM is typically at 0x00000000-0x0fffffff, on up to four parallell
tiles, i.e. up to four completely independent CPUs are booted off the
same ROM and using a set of shared peripherals.

>> Thanks, I'll fix up my patch.
>>
> Feel free to add my ack after the fixup if you need one.

Thanks!

Yours,
Linus Walleij