i.mx6 USDHC SD Card Register

/**************************************************************************** * I.MX6 uSDHC SD card reg Ister * Statement: * This article is mainly to record the SD card registration related processes and some problems encountered. * 2015-12-20 Shenzhen Nanshan Ping Shan village Zengjianfeng ******************************************************** *******************/                    \\\\\\\\\\\\\-*-Directory-*-/////////////|First, reference article:|two, pin configuration:|three, board-level file configuration:|Four, open SDHCI drive:|v. Resolve Exexplorer Unable to delete file-------------------------------------First, reference article: Android4.4.2SD card Rights fix 1.2 Chinese http://www.sonyue.com/bbs/forum.php?mod=viewthread&tid=93351two, pin configuration: Cat Arch/arm/mach-mx6/board-mx6dl_sabresd.h ...Staticiomux_v3_cfg_t mx6dl_sabresd_pads[] = {            ......            /*USDHC3*/Mx6dl_pad_sd3_clk__usdhc3_clk_50mhz, Mx6dl_pad_sd3_cmd__usdhc3_cmd_50mhz, mx6dl_p Ad_sd3_dat0__usdhc3_dat0_50mhz, Mx6dl_pad_sd3_dat1__usdhc3_dat1_50mhz, Mx6dl_pad_sd3_dat2__usdhc3_da T2_50mhz, Mx6dl_pad_sd3_dat3__usdhc3_dat3_50mhz,/*SD3_CD*/Mx6dl_pad_key_col2__gpio_4_10,/*sd3_wp not used*/mx6dl_pad_sd3_rst__gpio_7_8, ...} ..... Three, board-level file configuration: Cat Arch/arm/mach-mx6/board-mx6q_sabresd.c ...#defineSABRESD_SD3_CD IMX_GPIO_NR (4, 10)        ......        Static Const structEsdhc_platform_data Mx6q_sabresd_sd3_data __initconst ={. Cd_gpio=Sabresd_sd3_cd,//no answer, so no, another reason is that we are using a TF card, no write protection issues//. Wp_gpio = sabresd_sd3_wp,. Keep_power_at_suspend =1,. Support_8bit=1,. Delay_line=0,. Cd_type=Esdhc_cd_controller,. runtime_pm=1,        }; ......        /** * Board specific initialization. */        Static void__init Mx6_sabresd_board_init (void)        {            ......            //currently our SD card is mounted on this topIMX6Q_ADD_SDHCI_USDHC_IMX (2, &mx6q_sabresd_sd3_data);        ......        } ..... Iv. turn on the SDHCI drive: Open the following red frame drive: ──────────────────────────────────────────────────────────────────────────────┌────── ───────────────────mmc/sd/SDIO card support─────────────────────────┐│arrow keys navigate the menu. <Enter> selects submenus--->.  ││highlighted Letters is hotkeys. Pressing<Y> includes, <N>excludes,││<M> modularizes features. Press <Esc><Esc> to exit, <?> forHelp, </>││ forSearch. Legend: [*] built-inch[] excluded <M> module < >module││┌────^(-) ────────────────────────────────────────────────────────────────┐│││[*] Deferr MMC layer resume until I/O isrequested││││< > SDIO Uart/gpsclasssupport││││<*>MMC host Test driver││││Mmc/sd/sdio Host Controller Drivers * * *││││< >ARM AMBA Multimedia Card Interface support││││<*>Secure Digital Host Controller Interface support││││< >SDHCI Support on PCI bus││││<*>SDHCI support on the platform specific bus││││[*] SDHCI Platform Support forThe Freescale esdhc i. mx controll││││< > TI Flash Media mmc/SD Interface Support (experimental) ││││< > ENE CB710 mmc/SD Interface support││││< > VIA sd/MMC Card Reader driver│││└────v (+) ────────────────────────────────────────────────────────────────┘│ ├────────────────────────────────────────────────────────────────────────────┤│<Select> < Exit > < Help >│└────────────────────────────────────────────────────────────────────────────┘ Five, solve the Exexp Lorer Unable to delete file1. From Android4.4. 2, the Google system disabled the external memory card third-party program write permission, so the large-capacity SD card is useless. 2Search the network, we can find a solution, but too complex, and easy to mistake. 3Add Write access to an external card4. Re Manager, open the/system/etc/permissions directory with a text editor."platform.xml "file (Mount read/write),<permission name="Android.permission.WRITE_EXTERNAL_STORAGE"> < Group gid="SDCARD_RW"/>Add a line below<group gid="MEDIA_RW"/>(Note the alignment of the first paragraph,"MEDIA_RW"and/>) Save and exit, restart the system.

i.mx6 USDHC SD Card Register