TI中文支持网SDK版本为8.0，启动后打印log
[ 1.693930] mousedev: PS/2 mouse device common for all mice
[ 1.699960] i2c /dev entries driver
[ 1.705907] omap_hsmmc 48060000.mmc: Got CD GPIO
[ 1.746774] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.754566] oprofile: using arm/armv7
[ 1.759592] Initializing XFRM netlink socket
[ 1.764633] NET: Registered protocol family 10
[ 1.774912] sit: IPv6 over IPv4 tunneling driver
[ 1.782636] NET: Registered protocol family 17
[ 1.787507] NET: Registered protocol family 15
[ 1.792659] Key type dns_resolver registered
[ 1.797426] omap_voltage_late_init: Voltage driver support not added
[ 1.804085] sr_dev_init: No voltage domain specified for smartreflex0. Cannot initialize
[ 1.812592] sr_dev_init: No voltage domain specified for smartreflex1. Cannot initialize
[ 1.822562] ThumbEE CPU extension supported.
[ 1.827207] Registering SWP/SWPB emulation handler
[ 1.832240] SmartReflex Class3 initialized
[ 1.848085] omap_hsmmc 48060000.mmc: no support for card's volts
[ 1.854393] mmc0: error -22 whilst initialising SD card
[ 1.861362] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[ 1.867151] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
mmc0: error -22 whilst initialising SD card这是什么原因导致的？
Jian Zhou：
请问这是TI开发板上的log还是您自己板子上的log？
xiaoxia jiang：
回复 Jian Zhou:
自己板子上的
Yaoming Qin：
查查您的硬件, 看是不是线记错了，您可以参考 http://www.friendlyarm.net/forum/topic/867
zoro li：
3年后, 遇到相同问题, 记录帮助后面的同志们
原因如下:
dts中mmc没有设置 vmmc-supply的值
因为我们的硬件sd上一直有电的,所以我把这个vmmc-supply删除了,觉得没有什么用.
但是代码中
omap_hsmmc_reg_get
-> mmc_regulator_get_supply
-> mmc_regulator_get_ocrmask 这里会去解析vmmc-supply相关的东西
解析ok的话 会对mmc->ocr_avail赋值
这个值不对的话
其实在后面还有这样一句
if (!mmc->ocr_avail) mmc->ocr_avail = mmc_pdata(host)->ocr_mask;
不幸的是 ocr_mask 也是空
于是mmc->ocr_avail为空就会打印
omap_hsmmc 48060000.mmc: no support for card's volts
对于不需要上下电的sd来说 vmmc-supply可以这样设置
&mmc1 { status = "okay"; bus-width = <4>; pinctrl-names = "default"; pinctrl-0 = <&mmc1_pins>; vmmc-supply = <&vmmcsd_fixed>; broken-cd;};
/ {
…….
vmmcsd_fixed: fixedregulator0 { compatible = "regulator-fixed"; regulator-name = "vmmcsd_fixed"; regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; }; };
