Trying to add an additional sdcard using the mmc3 sdio interface. Looking at this: https://2captiv8.blogspot.com/2016/08/mmc2-linux-device-tree-configuration.html
also looking at this https://e2e.ti.com/support/processors/f/791/t/448441 Here is my device tree &mmc3 { ti,dual-volt; ti,needs-special-reset; ti,needs-special-hs-handling; status = "okay"; bus-width = <0x4>; pinctrl-names = "default"; pinctrl-0 = <&mmc3_pins>; cd-gpios = <&gpio0 31 GPIO_ACTIVE_LOW>; vmmc-supply = <&vmmcsd_fixed>; dmas = <&edma_xbar 12 0 1 &edma_xbar 13 0 2>; dma-names = "tx", "rx"; #address-cells = <1>; #size-cells = <0>; max-frequency = <50000000>; }; mmc3_pins: pinmux_mmc3_pins { pinctrl-single,pins = < AM33XX_IOPAD(0x830, PIN_INPUT_PULLUP | MUX_MODE3) /* gpmc_ad12.mmc2_dat0 */ AM33XX_IOPAD(0x834, PIN_INPUT_PULLUP | MUX_MODE3) /* gpmc_ad13.mmc2_dat1 */ AM33XX_IOPAD(0x838, PIN_INPUT_PULLUP | MUX_MODE3) /* gpmc_ad14.mmc2_dat2 */ AM33XX_IOPAD(0x83C, PIN_INPUT_PULLUP | MUX_MODE3) /* gpmc_ad15.mmc2_dat3 */ AM33XX_IOPAD(0x888, PIN_INPUT_PULLUP | MUX_MODE3) /* gpmc_csn3.mmc2_cmd */ AM33XX_IOPAD(0x88c, PIN_INPUT_PULLUP | MUX_MODE3) /* gpmc_clk.mmc2_clk */ AM33XX_IOPAD(0x874, PIN_INPUT_PULLDOWN | MUX_MODE7) /* gpmc_wpn.mmc2_sdcd.gpio0_31 */ AM33XX_IOPAD(0x840, PIN_INPUT | MUX_MODE7) /* gpmc.a0.gpio1_16 */ >; }; The board will recognize the total size of the sdcard (32GB cards shows at 29.8GB) but it throws a bunch of errors and can't read the partition table as a result [2.579851] omap_hsmmc 48710000.mmc: Got CD GPIO [2.666924] mmc2: host does nto support reading read-only switch, assuming write-enable [2.671598] mmc2: new high speed SDHC card at address 0001 [2.691758] mmcblk2: mmc2:0001 GB1QT 29.8 GiB [2.712584] mmcblk2: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00 [2.809247] mmcblk2: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0xb00 [2.818904] mmcblk2: retrying using single block read [2.833104] mmcblk2: error -84 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0 More error -84 continue to stream out for various different sectors. I'm breadboarded to an external uSDcard slot, so I'm thinking it may be signal integrity issue. I changed max-frequency to lower values, but that didn't help. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/9d3b2892-e4b8-4862-97b0-f73f07fe3cec%40googlegroups.com.
