MMC Core:负责Host Controller、MMC/SD/SDIO Card等硬件抽象,提供Platform Device、OF、Regulator、PowerSeq、Clock、debugfs等功能。提供统一的Host Controller驱动API,以及MMC、SD卡驱动。 Host Driver:MMC/SD/SDIO Host设备驱动。 外设驱动:包括SDIO外设等,其中SD卡、MMC等驱动在MMC Core中已经提供。 2.3 SD DTS示...
会调用driver->probe => mmc_driver.probe //card/block.c mmc_blk_probe //card/block.c 详细流程见下边 //driver->probe对应mmc_driver.probe原因: //card/block.c=>mmc_blk_init => mmc_register_driver(&mmc_driver); mmc_card_set_present(card); //include/linux/mmc/card.h card->state |=...
static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, struct mmc_card *oldcard) 传入参数 truct mmc_host *host mmc/sd/sdio主机控器的结构,成员用到再说明 u32 ocr 这个比较重要,与ACMD41和sd卡中ocr寄存器相关。调用mmc_sd_init_card之前 linux已经做过一些工作,就是发送ACMD41获取SD卡工作...
card->type = MMC_TYPE_SD_COMBO;if(oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||memcmp(card->raw_cid, oldcard->raw_cid,sizeof(card->raw_cid)) !=0)) { err = -ENOENT;gotomismatch; } }else{ card->type = MMC_TYPE_SDIO;if(oldcard && oldcard->type != MMC_TYPE_SDIO) ...
MMC 子系统的框架结构如下图所示,其中core layer根据MMC/SD设备协议标准实现了协议。card layer与Linux的块设备子系统对接,实现块设备驱动以及完成请求,具体协议经过core layer的接口,最终通过host layer完成传输,对 MMC设备进行实际的操作。和 MMC设备硬件相对应,host和card可以分别理解为 MMC device的两个子设备:MMC...
you have an SD-card reader either connected via USB, or build into your computer.Wednesday, May 1, 2019 2:44 AMIt seems like a build in card reader on your machine does not have a specific driver installed.Check Device Manger and update driver software for your card reader and USB....
Link: https://lore.kernel.org/linux-mmc/c73b9ba9-1699-2aff-e2fd-b4b4f292a3ca@raspberrypi.org/ Link: https://stackoverflow.com/questions/67620728/mmc-spi-issue-not-able-to-setup-mmc-sd-card-in-linux Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger....
I wrote some wrong commands to load my custom built kernel image on MMC/SD card and it destroyed the partition of MMC/SD card. My u-boot is is working through which I can boot my kernel with NFS server. Now, I would like to know the procedure to set up MMC/SD card so that I ...
mmc1: mmc_rescan_try_freq: trying to init card at 400000 Hz i have made the following modifications to have a second SD card reader : 1° call mmc1_init : {mmc1_init, DEV_ON_BASEBOARD, PROFILE_ALL}, /* added */ {mmc0_init, DEV_ON_BASEBOARD, PROFILE_ALL}, ...
mmc0的SD卡能正常识别,但是mmc1的emmc无法识别,部分log信息如下,停在了Waiting for root device /dev/mmcblk1p1... [ 2.962460] mmc0: new high speed SDHC card at address 1234 [ 2.968632] mmcblk0: mmc0:1234 SA04G 3.67 GiB [ 2.975088] mmcblk0: unknown partition table...