如何在beagleBone Black开发板上使用SPI

我先描述我遇到的问题。
我按照网上的教程先升级的我的dtc
# dtc --version
Version: DTC 1.4.1-g1e75ebc9

并且下载了 bb.org-overlays 目录
升级和安装了最新的dtbo文件。
执行命令： echo 'BB-SPIDEV0' > /sys/devices/platform/bone_capemgr/slots
之后在dmesg 命令中显示如下
[  211.311073] bone_capemgr bone_capemgr: part_number 'BB-SPIDEV0', version 'N/A'
[  211.319322] bone_capemgr bone_capemgr: slot #5: override
[  211.330263] bone_capemgr bone_capemgr: Using override eeprom data at slot 5
[  211.342033] bone_capemgr bone_capemgr: slot #5: 'Override Board Name,00A0,Override Manuf,BB-SPIDEV0'
[  211.370595] bone_capemgr bone_capemgr: slot #5: dtbo 'BB-SPIDEV0-00A0.dtbo' loaded; overlay id #1
[ 2852.625316] bone_capemgr bone_capemgr: part_number 'BB-SPIDEV0', version 'N/A'

并且/dev目录下有 spidev1.0 spidev1.1两个设备。
但是用linux自带的spidev_test.c 这个程序测试的时候没有任何数据显示，
这是为什么，而且在pingroup这个文件中也没有SPI的引脚配置。
root@beaglebone:/dev# cat /sys/kernel/debug/pinctrl/44e10800.pinmux/pingroups
registered pin groups:
group: pinmux_uart0_pins
pin 92 (44e10970.0)
pin 93 (44e10974.0)

group: cpsw_default
pin 66 (44e10908.0)
pin 67 (44e1090c.0)
pin 68 (44e10910.0)
pin 69 (44e10914.0)
pin 70 (44e10918.0)
pin 71 (44e1091c.0)
pin 72 (44e10920.0)
pin 73 (44e10924.0)
pin 74 (44e10928.0)
pin 75 (44e1092c.0)
pin 76 (44e10930.0)
pin 77 (44e10934.0)
pin 78 (44e10938.0)
pin 79 (44e1093c.0)
pin 80 (44e10940.0)

group: cpsw_sleep
pin 66 (44e10908.0)
pin 67 (44e1090c.0)
pin 68 (44e10910.0)
pin 69 (44e10914.0)
pin 70 (44e10918.0)
pin 71 (44e1091c.0)
pin 72 (44e10920.0)
pin 73 (44e10924.0)
pin 74 (44e10928.0)
pin 75 (44e1092c.0)
pin 76 (44e10930.0)
pin 77 (44e10934.0)
pin 78 (44e10938.0)
pin 79 (44e1093c.0)
pin 80 (44e10940.0)

group: davinci_mdio_default
pin 82 (44e10948.0)
pin 83 (44e1094c.0)

group: davinci_mdio_sleep
pin 82 (44e10948.0)
pin 83 (44e1094c.0)

group: pinmux_mmc1_pins
pin 88 (44e10960.0)

group: pinmux_emmc_pins
pin 32 (44e10880.0)
pin 33 (44e10884.0)
pin 0 (44e10800.0)
pin 1 (44e10804.0)
pin 2 (44e10808.0)
pin 3 (44e1080c.0)
pin 4 (44e10810.0)
pin 5 (44e10814.0)
pin 6 (44e10818.0)
pin 7 (44e1081c.0)

group: pinmux_i2c0_pins
pin 98 (44e10988.0)
pin 99 (44e1098c.0)

group: pinmux_i2c2_pins
pin 94 (44e10978.0)
pin 95 (44e1097c.0)

group: user_leds_s0
pin 21 (44e10854.0)
pin 22 (44e10858.0)
pin 23 (44e1085c.0)
pin 24 (44e10860.0)

group: pinmux_bb_uart1_pins
pin 97 (44e10984.0)
pin 96 (44e10980.0)

跪求高手帮我解惑
Linux version 4.4.29-bone-rt-r14 (root@a2-imx6q-wandboard-2gb) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 PREEMPT RT Tue Nov 1 21:30:09 UTC 2016