什么是sdhci的adma mode
时间: 2023-12-27 16:05:26 浏览: 26
SDHCI(Secure Digital Host Controller Interface)是一种用于与SD卡、MMC(MultiMediaCard)和SDIO(SD Input/Output)设备通信的标准接口。ADMA(Alternate Direct Memory Access)模式是SDHCI控制器中的一种传输模式。
在ADMA模式下,数据传输直接从SD卡的存储区域到主机内存,或者从主机内存到SD卡的存储区域,绕过了CPU的直接参与。这种方式可以提高数据传输的效率和速度,减轻CPU的负担,提升系统性能。
ADMA模式需要硬件支持,并且在驱动程序和操作系统中进行相应的配置和管理。它通常用于高性能存储设备,如高速SD卡和闪存驱动器等,以实现更快的数据传输速度。
相关问题
sdhci register dump
SDHCI (Secure Digital Host Controller Interface) is a type of interface that allows a computer to communicate with SD (Secure Digital) and MMC (Multimedia Card) memory cards.
The "sdhci register dump" command is used to display the current values of the SDHCI controller registers. This information can be useful when troubleshooting issues with SD card communication or performance.
To execute the "sdhci register dump" command, you will need to have access to the command prompt or terminal on your computer. The exact syntax of the command may vary depending on your operating system and the specific SDHCI controller being used.
Here is an example of what the output of the "sdhci register dump" command might look like:
```
SDHCI Version: 3.0
Vendor: ABC Corporation
Product: SDHCI Controller
Controller Version: 1.2
Supported Modes: SD, MMC
Clock Frequency: 50 MHz
Bus Width: 4-bit
Base Address: 0x12345678
Registers:
SDHC_CTRL: 0x00000001
SDHC_CMD: 0x00000002
SDHC_DATA: 0x00000000
SDHC_INT_STATUS: 0x00000008
SDHC_INT_ENABLE: 0x00000008
SDHC_CAPABILITIES: 0x0000003F
```
This output shows the version, vendor, and product information for the SDHCI controller, as well as the clock frequency, bus width, and base address. It also lists the current values of several important registers, including the control register, command register, data register, interrupt status register, interrupt enable register, and capabilities register.
sdhci_slot
根据提供的引用内容,我们可以得知sdhci_slot是一个与驱动程序相关的问题。具体来说,在驱动程序中,sdhci_slot是一个表示SD卡槽的标识符。在驱动程序中,通过定义和匹配该标识符,来进行SD卡槽的相关操作。具体的实现细节和代码逻辑可以参考驱动程序的probe方法和相关的设备树匹配配置。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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