(资料图)

1、将mmc_test.c编译到内核

默认情况下，mmc_test.c是独立的文件，并没有编译到内核中，需要我们到menuconfig中手动打开。

打开的配置有：CONFIG_MMC_TEST、CONFIG_MMC_DEBUG、CONFIG_DEBUG_FS三个配置。

注意：CONFIG_MMC_TEST，该选项可以选择M和*，分别对应为：编译成模块或者直接编译到内核

2、mmc_test绑定

默认情况下，我们一般都已经加载了mmc driver，那么要想使用mmc_test工具测试，需要将mmc设备绑定到该mmc_test驱动上。

2.1、查看驱动编号

通过下面命令，查询对应的mmc编号，如下：mmc0:0001，忽略掉\

ls/sys/bus/mmc/drivers/mmcblk/mmc0\:0001/

2.2、解绑mmc原驱动

echommc0:0001>/sys/bus/mmc/drivers/mmcblk/unbind

2.3、绑定mmc_test驱动

echommc0:0001>/sys/bus/mmc/drivers/mmc_test/bind

2.4、debugfs挂载

mount-tdebugfsnone/sys/kernel/debug

2.5、查看测试列表

cd/sys/kernel/debug/mmc0/mmc0\:0001/cattestlist

0:Runalltests1:Basicwrite(nodataverification)2:Basicread(nodataverification)3:Basicwrite(withdataverification)4:Basicread(withdataverification)5:Multi-blockwrite6:Multi-blockread7:Poweroftwoblockwrites8:Poweroftwoblockreads9:Weirdsizedblockwrites10:Weirdsizedblockreads11:Badlyalignedwrite12:Badlyalignedread13:Badlyalignedmulti-blockwrite14:Badlyalignedmulti-blockread15:Correctxfer_sizeatwrite(startfailure)16:Correctxfer_sizeatread(startfailure)17:Correctxfer_sizeatwrite(midwayfailure)18:Correctxfer_sizeatread(midwayfailure)19:Highmemwrite20:Highmemread21:Multi-blockhighmemwrite22:Multi-blockhighmemread23:Best-casereadperformance24:Best-casewriteperformance25:Best-casereadperformanceintoscatteredpages26:Best-casewriteperformancefromscatteredpages27:Singlereadperformancebytransfersize28:Singlewriteperformancebytransfersize29:Singletrimperformancebytransfersize30:Consecutivereadperformancebytransfersize31:Consecutivewriteperformancebytransfersize32:Consecutivetrimperformancebytransfersize33:Randomreadperformancebytransfersize34:Randomwriteperformancebytransfersize35:Largesequentialreadintoscatteredpages36:Largesequentialwritefromscatteredpages37:Writeperformancewithblockingreq4kto4MB38:Writeperformancewithnon-blockingreq4kto4MB39:Readperformancewithblockingreq4kto4MB40:Readperformancewithnon-blockingreq4kto4MB41:Writeperformanceblockingreq1to512sgelems42:Writeperformancenon-blockingreq1to512sgelems43:Readperformanceblockingreq1to512sgelems44:Readperformancenon-blockingreq1to512sgelems45:Resettest46:Commandsduringread-noSetBlockCount(CMD23)47:Commandsduringwrite-noSetBlockCount(CMD23)48:Commandsduringread-useSetBlockCount(CMD23)49:Commandsduringwrite-useSetBlockCount(CMD23)50:Commandsduringnon-blockingread-useSetBlockCount(CMD23)51:Commandsduringnon-blockingwrite-useSetBlockCount(CMD23)

2.6、测试指定命令

echonumber>test

number：是上面的测试序号。

如：echo 1 > test

mmc0:Startingtestsofcardmmc0:0001...mmc0:Testcase1.Basicwrite(nodataverification)...mmc0:Result:OK

来源：嵌入式艺术

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