Hi, I have a prototype board based on the 3530EVM which cannot read its microSD card. I enabled CONFIG_MMC_DEBUG and other printks to the 2.6.29rc3 kernel and can see that info like the transfer rate is coming back but after I reach mmc_set_clock() and setting the bus width, I just get timeouts (output below). Looking at DAT0-3 on a scope, I see activity on DAT0, but the other lines just follow the MMC power, up for ~800ms then off. As an experiment, I tried commenting-out these 2 lines in drivers/mmc/host/omap_hsmmc.c: mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED; ... mmc->caps |= MMC_CAP_4_BIT_DATA; in an attempt to use slow, 1-wire transfers, but that got me a panic in mmc_omap_irq(). Assuming the hardware is functioning, is there a way to force the SD controller into its simplest/slowest mode to improve my chances of reading the card? Thanks! , John ... mmc0: starting CMD9 arg 8fe40000 flags 00000007 MMC: IRQ Status is 1 drivers/mmc/core/sd.c 102 mmc_decode_csd() csd_struct=0 tacc_ns=0 tacc_clks=0 max_dtr=25000000 cmdclass=1461 capacity=7744512 drivers/mmc/core/sd.c 67 mmc_decode_cid() manfid=3 prod_name=SU04G card type=1 card state=8 mmc0: starting CMD7 arg 8fe40000 flags 00000015 MMC: IRQ Status is 1 mmc0: starting CMD55 arg 8fe40000 flags 00000095 MMC: IRQ Status is 1 mmc0: starting CMD51 arg 00000000 flags 000000b5 MMC: IRQ Status is 3 drivers/mmc/core/sd.c 183 mmc_decode_scr() mmc0: starting CMD6 arg 00fffff1 flags 000000b5 MMC: IRQ Status is 3 drivers/mmc/core/sd.c 261 mmc_switch_hs() mmc0: starting CMD6 arg 80fffff1 flags 000000b5 MMC: IRQ Status is 3 card->csd.max_dtr=25000000 mmc_card_highspeed true max_dtr=50000000 drivers/mmc/core/core.c:443 mmc_set_clock() mmc_app_set_bus_width() mmc_app_set_bus_width MMC_BUS_WIDTH_4 mmc0: starting CMD55 arg 8fe40000 flags 00000095 MMC: IRQ Status is 18000 mmc0: starting CMD55 arg 8fe40000 flags 00000095 drivers/mmc/host/omap_hsmmc.c 535 MMC: IRQ Status is 18000 mmc0: starting CMD55 arg 8fe40000 flags 00000095 MMC: IRQ Status is 18000 mmc0: starting CMD55 arg 8fe40000 flags 00000095 MMC: IRQ Status is 18000 drivers/mmc/core/sd.c 559 mmc_app_set_bus_width failed mmc0: error -110 whilst initialising SD card -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
