Messages in this thread | | | From | Robin Getz <> | Subject | Re: [PATCH 7/7] mmc_spi: support for non-byte-aligned cards | Date | Wed, 11 Mar 2009 19:42:49 -0400 |
| |
On Wed 11 Mar 2009 11:03, Will Newton pondered: > On Wed, Mar 11, 2009 at 3:00 PM, Wolfgang Mües > <wolfgang.mues@auerswald.de> wrote: > > Will, > > > > Am Mittwoch, 11. März 2009 schrieb Will Newton: > >> Are they using the same host controller? Have you tried these cards > >> with a different host controller? > > > > I have tried with 3 different spi host controllers. > > > >> Are you clocking them particularly slow or fast? > > > > 400 KHz, 20 MHz and 25 MHz. > > > >> A logic probe may not display any signal integrity issues you might have. > > > > My "logic probe" is a 1 GHz leCroy DSO. > > > > I am doing this for money, and I am no amateur. > > Ok, sure, but these are things that are best put in your changleogs so > people can understand what hardware is problematic and how it is > proven. > > I have not seen these problems or seen them reported by others. > Hopefully they will speak up and confirm your results.
We have seen the same issues, and have had various Blackfin users report the same with a select number of cards. (including Kingston cards that Wolfgang referenced).
A few (who also had ARM platforms) said they saw the same on different SPI controllers - so I don't think it is a Blackfin specific issue.
-Robin -- 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/
| |