beagleboard-xm revc配合外接的扩展板，怎么用linux的内核都检测不到触摸屏设备。我除了用自己移植的还用来扩展板自带的agstrom的linux内核都检测不到。用android的内核就可以，有人遇到过这个问题吗
9.669769]
[ 9.674102] ads7846 spi3.0: touchscreen, irq 322
[ 9.679046] ads7846 spi3.0: no device detected, test read result was 0x00000000
[ 9.687042] input: twl4030_pwrbutton as /devices/platform/i2c_omap.1/i2c-1/1-0049/twl4030_pwrbutton/input/input1
[ 9.697753] i2c /dev entries driver
[ 9.701934] Linux video capture interface: v2.00
[ 9.706909] omap-iommu omap-iommu.0: isp: version 1.1
