balrogg at gmail.com
Mon Apr 28 13:51:03 CEST 2008
On 28/04/2008, Andy Green <andy at openmoko.com> wrote:
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> Somebody in the thread at some point said:
> | On 28/04/2008, Werner Almesberger <werner at openmoko.org> wrote:
> |> > Basically a form of SDIO multiplexing.
> |> > Other options would be SPI.
> |> We once asked Samuel about SPI, and he said that it would be slower,
> |> but still good enough. (In real life, the theoretically possible
> |> maximum speed is rarely reached anyway.)
> |> Without digging through the Atheros driver, I don't know how much work
> |> it would be to put it on SPI. If the abstraction is clean, it could be
> |> very simple. If not, a pain.
> | You'd need to also adapt the mmc/sd stack in linux/drivers/mmc/ to use
> | the SPI mode because it's not supported by linux at the moment. In
> | this mode different MMC commands are allowed and the state machine is
> | a little different. There may already be patches available somewhere.
> I think we propose to just move WLAN interface to native SPI, leave MMC
> / SD using native SDIO interface from S3C2442. So no need for
> considering the SPI mode of MMC commands.
Oops sorry then. Multiplexing made me think of multiplexing on the mmc
bus, which also is an allowed configuration.
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