Re: [PATCH v2] fsldma: add support to 36-bit physical address

From: Timur Tabi
Date: Mon Nov 15 2010 - 11:14:39 EST


On Mon, Nov 15, 2010 at 9:16 AM, Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx> wrote:

> The programming model (if you look at the free-space in the registers and data structures) supports a 64-bit address.  I'm trying to avoid changing the driver in the future if we have >36-bit.  However this is such a minor worry that I'll stop and just ack the patch as is.

I must still be missing something. I'm looking at the description of
the SATR register in the MPC8572 RM, and it shows this:

0 - 3 | 4 - 5 | 6 | 7 | 8 - 11 | 12 - 15 | 16-21 | 22-31
--- | STFLOWLVL | SPCIORDER | SSME | STRANSINT | SREADTTYPE | --- | ESAD

The most that we can extend ESAD to is 16 bits, for a total of a
48-bit physical address. Where are the other 16 bits supposed to go?

--
Timur Tabi
Linux kernel developer at Freescale
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