Messages in this thread |  | | | Date | Sat, 19 Jul 2008 01:01:43 +0200 | | From | Pierre Ossman <> | | Subject | Re: [PATCH 1/3] at91_mci: Enable MMC_CAP_SDIO_IRQ only when it actually works |
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On Fri, 18 Jul 2008 15:30:40 +0200 Nicolas Ferre <nicolas.ferre@atmel.com> wrote:
> Pierre Ossman : > > > > Not all SDIO cards use 4-bit mode, so it looks to me like you have to > > disable it completely (unless there's a third revision where it works > > without any fine print?). > > Well, I understand. > > In your opinion, a printed warning that says to be sure to use only > 4-bit mode SDIO cards on slot B... is not acceptable ? >
It's not really up to the user. The SDIO spec does not mandate 4-bit support, so some cards will not have it.
> It kind of disappoints me to remove this feature as the > at91sam9260ek/9xe/9g20 board uses only slot B, and I really like to > connect SDIO with IRQ on it. >
I haven't seen the erratum, but is there no way to poke the hardware into getting the interrupt running even in 1-bit mode?
-- -- Pierre Ossman
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