Messages in this thread | | | From | Timur Tabi <> | Date | Mon, 15 Nov 2010 10:13:58 -0600 | Subject | Re: [PATCH v2] fsldma: add support to 36-bit physical address |
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On Mon, Nov 15, 2010 at 9:16 AM, Kumar Gala <galak@kernel.crashing.org> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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