Hi Wolfram, On Wed, Feb 16, 2011 at 04:33:32PM +0100, Wolfram Sang wrote: > Hi Shawn, > > [CRC failures on MMC] > > I guess you will also get the unknown partition table message if you > > test this card on mx35 right now. > > No, I didn't see that message on MX35. (Doesn't matter much now). > > > I just tested 7 mmc cards in total. 6 cards work fine, and 1 card > > (Transcend MMC plus 1GB) has the exactly same problem as yours. And > > if I remove the 8 bit cap, this card also works fine. So I would > > agree with Russell that it's unrelated to the driver. > > Ah, the 8_BIT_CAP was the right pointer. It works now and I can see the > partitions \o/ But IMHO it is related to the driver because it cannot set that > 8_BIT_DATA_CAP unconditionally? Probably something like 'flags' should be added > to platform_data? One flag could then be 8_BIT_CAPABLE_SLOT or something. > If a platform is designed to support 8-bit mode (e.g. all 8 data lines are routed), I do not think the 8-bit cap will be removed from this platform just because one particular card has problem to work in 8-bit mode. But I would anyway let platform_data tell the 4 BIT_CAP and 8_BIT_CAP just like what Freescale BSP is doing, as some platforms may design this cap differently. > > I tested the SDIO, but probably in different way from yours. I had > > two card slots on my board, rootfs on mmc0 and SDIO card on mmc1. > > It seems working fine in this way. However, when I use nfs and test > > SDIO on mmc0, my systems hangs too. I will look into it. > > The latter scenario is the only one I can test, because I don't have an > (active) second slot. > It's a board thing. I just rechecked the schematics of mx28evk board, and found that the power supply of the two slots are different. The mmc1 uses the external regulator REG_3V3 which can supply up to 1.5 A current, while mmc0 uses mx28 internal regulator VDDIO_3V3 which has very limited current capability. That's why my SDIO WiFi card works on mmc1 slot while hangs system on mmc0. When I reworked the board to supply mmc0 with REG_3V3, the card works on mmc0 too. So your board supplies mmc0 slot with VDDIO_3V3 as well? -- Regards, Shawn -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
