I am using the Digilent PmodSD as the second sd card for the BBB: 
http://www.digilentinc.com/Products/Detail.cfm?Prod=PMOD-SD

I've been following this forum: 
http://www.alteraforum.com/forum/showthread.php?t=19335&page=4

but assumes that i have the mmc_spi driver, which isnt found in the 
4.1.2-ti-r4 kernel on my beaglebone: mmc_spi.c source file doesnt exist 
also.

root@beaglebone:~# find /lib/modules/`uname -r` -type f -name "*.ko" | grep 
mmc

/lib/modules/4.1.2-ti-r4/kernel/drivers/media/mmc/siano/smssdio.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/sdhci.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/vub300.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/dw_mmc-exynos.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/dw_mmc-pltfm.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/ushc.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/dw_mmc.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/sdhci-pltfm.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/host/rtsx_usb_sdmmc.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mmc/card/sdio_uart.ko


 root@beaglebone:~# find /lib/modules/`uname -r` -type f -name "*.ko" | 
grep spi


/lib/modules/4.1.2-ti-r4/kernel/drivers/misc/ad525x_dpot-spi.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/spi/spi-butterfly.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/spi/spi-lm70llp.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/spi/spi-omap2-mcspi.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mtd/spi-nor/spi-nor.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/scsi/scsi_transport_spi.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/net/wireless/ti/wl1251/wl1251_spi.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/net/wireless/ti/wlcore/wlcore_spi.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/net/can/spi/mcp251x.ko
/lib/modules/4.1.2-ti-r4/kernel/drivers/mfd/mc13xxx-spi.ko


 In another forum, a person solved this by actually interfacing the second 
SD to the mmc lines:  SPI-SD Card 
<https://groups.google.com/forum/embed/?place=forum/beagleboard&showsearch=true&showpopout=true&showtabs=true&hideforumtitle=true&parenturl=http%3A%2F%2Fbeagleboard.org%2FCommunity%2FForums#!searchin/beagleboard/sdcard$20spi/beagleboard/kEor_xLLEnQ/OzV0f5H53WwJ>

I dont see how this will work since mmc1 lines on the p8 header are used by 
the board. And when i wire my sd card to these lines the Beaglebone doesnt 
boot up.  Also the mmc2 on the p8 header doesnt have a cmd mode pin 
(mmc2_cmd), so i cant use these lines.  There are another set of mmc2 lines 
on the p9 header but its also missing a mmc2_cmd and a  mmc2_clk mode pin. 

  Any insight on how to add a second SD card?

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