Android(安卓)Vold和SDIO冲突问题解决方法

开发板有两个MMC接口，一个挂载SD卡，另外一个挂载SDIO接口，当同时工作，启动Android时Vold会崩溃导致无法启动。
错误代码如下：
# logcat

I/vold ( 1930): Android Volume Daemon version 2.0

E/ ( 1941): listen at 0.0.0.0:22501

I/vold ( 1930): New MMC card 'SA02G' (serial 2619342940) added @ /devices/platform/mxsdhci.0/mmc_host/mmc0/mmc0:1234

I/vold ( 1930): Disk (blkdev 179:0), 3854336 secs (1882 MB) 2 partitions

I/vold ( 1930): New blkdev 179.0 on media SA02G, media path /devices/platform/mxsdhci.0/mmc_host/mmc0/mmc0:1234, Dpp 2

I/vold ( 1930): Partition (blkdev 179:1), 2097153 secs (1024 MB) type 0x83

I/vold ( 1930): New blkdev 179.1 on media SA02G, media path /devices/platform/mxsdhci.0/mmc_host/mmc0/mmc0:1234, Dpp 1

I/vold ( 1930): Partition (blkdev 179:2), 1717183 secs (838 MB) type 0x83

I/vold ( 1930): New blkdev 179.2 on media SA02G, media path /devices/platform/mxsdhci.0/mmc_host/mmc0/mmc0:1234, Dpp 0

I/vold ( 1930): Evaluating dev '/devices/platform/mxsdhci.0/mmc_host/mmc0/mmc0:1234/block/mmcblk0' for mountable filesystems for '/sdcard'

I/vold ( 1930): Aborting start of /sdcard (bootstrap = 1)

I/vold ( 1930): Volmgr not ready to handle device

I/DEBUG ( 1931): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

I/DEBUG ( 1931): Build fingerprint: 'freescale/imx51_BBG/imx51_BBG/:2.1/ERD79/eng.root.20100527.144938:eng/test-keys'

I/DEBUG ( 1931): pid: 1930, tid: 1930 >>> /system/bin/vold <<<

I/DEBUG ( 1931): signal 11 (SIGSEGV), fault addr 00000000

I/DEBUG ( 1931): r0 00000000 r1 00020000 r2 80808080 r3 00000000

I/DEBUG ( 1931): r4 000121d4 r5 be97140c r6 be9713f8 r7 be971610

I/DEBUG ( 1931): r8 00000000 r9 00000000 10 00000000 fp 00000000

I/DEBUG ( 1931): ip 00012320 sp be9713d8 lr 0000a9a5 pc afe0e7c8 cpsr 40000010

I/DEBUG ( 1931): #00 pc 0000e7c8 /system/lib/libc.so

I/DEBUG ( 1931): #01 pc 0000a9a2 /system/bin/vold

I/DEBUG ( 1931): #02 pc 0000ab48 /system/bin/vold

I/DEBUG ( 1931): #03 pc 0000ac26 /system/bin/vold

I/DEBUG ( 1931): #04 pc 00009844 /system/bin/vold

I/DEBUG ( 1931): #05 pc 0000c2c6 /system/lib/libc.so

I/DEBUG ( 1931): #06 pc b00018aa /system/bin/linker

I/DEBUG ( 1931):

I/DEBUG ( 1931): code around pc:

I/DEBUG ( 1931): afe0e7b8 e31c0003 1afffff6 e1a00002 e59f20d8

I/DEBUG ( 1931): afe0e7c8 e490c004 e0433000 f5d0f040 e04c13a2

I/DEBUG ( 1931): afe0e7d8 e0011002 e1d1100c 0490c004 1a000022

I/DEBUG ( 1931):

I/DEBUG ( 1931): code around lr:

I/DEBUG ( 1931): 0000a994 9905edae f0009804 9003fcad edd6f7fe

I/DEBUG ( 1931): 0000a9a4 21009b03 4b3a181a 70113a01 18e19a03

I/DEBUG ( 1931): 0000a9b4 f7fe1c28 9803ed9c edf8f7fe f7fe1c28

I/DEBUG ( 1931):

I/DEBUG ( 1931): stack:

I/DEBUG ( 1931): be971398 00000000

I/DEBUG ( 1931): be97139c afe0bca5 /system/lib/libc.so

I/DEBUG ( 1931): be9713a0 00000000

I/DEBUG ( 1931): be9713a4 afe0b39b /system/lib/libc.so

I/DEBUG ( 1931): be9713a8 be97140c [stack]

I/DEBUG ( 1931): be9713ac 00000010

I/DEBUG ( 1931): be9713b0 be971610 [stack]
......

查看Vold的源码，vold 在读取/sys%s/type /sys%s/name

system/core/vold/mmc.c 可能为空，就会有栈错误。

修改patch 如下： Index: mmc.c =================================================================== --- mmc.c (revision 1) +++ mmc.c (revision 280) @@ -150,6 +150,11 @@ sprintf(filename, "/sys%s/type", devpath); p = read_file(filename, &sz); + if(p == NULL) + { + LOGE("Unable to read %s/n", filename); + return -errno; + } p[strlen(p) - 1] = '/0'; sprintf(tmp, "MMC_TYPE=%s", p); free(p); @@ -157,6 +162,11 @@ sprintf(filename, "/sys%s/name", devpath); p = read_file(filename, &sz); + if(p == NULL) + { + LOGE("Unable to read %s/n", filename); + return -errno; + } p[strlen(p) - 1] = '/0'; sprintf(tmp, "MMC_NAME=%s", p); free(p);

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