Pierre Ossman wrote:
madhu chikkature wrote:
Hi,
This is regarding the discussion going on in the list about the
support of SDIO cards in Linux. I read some discussion happening to
support SDIO cards using the existing Linux MMC core but I could not
figure out what would be the direction the community to support the
SDIO cards.
<snip>
With this, is it a fissible solution to have the MMC core do the
initialization part of the card by having the CMD sequence for SDIO
card (CMD5 and CMD3) in the mmc_setup sequence and maintain the SDIO
card list along with MMC/SD?
SD mandates a star topology (just a single card per bus), so we'll just
force a single card into the list. SD memory cards can actually work on
a shared bus, SDIO can not. It's not a big problem in practice though.
Is this true in SD-1 bit mode, or SPI?
I see nothing on a quick read-through of the abbreviated SDIO spec
precluding this.
Of course, it'd mean wire-or'd interrupt lines.
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