近期遇到一個SD燒錄的問題,256MB的SD卡無法識別,詳情如下:
兩個SD卡,一個256MB,一個4GB,裡面存放的文件相同。
Boot mode設定ok后上電,插入256MB的SD卡,串口仍然只是打印cccc,
然後拔出,重新插入4GB的SD卡,此時正常燒錄。
請問燒錄對SD卡有什麼要求么?
謝謝!
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请问是接在AM335x上么?
TRM对SD卡接口标准的描述如下:
Serial link supports full compliance with:
– MMC command/response sets as defined in the MMC standard specification v4.3.
– SD command/response sets as defined in the SD Physical Layer specification v2.00
– SDIO command/response sets and interrupt/read-wait suspend-resume operations as defined in
the SD part E1 specification v 2.00
– SD Host Controller Standard Specification sets as defined in the SD card specification Part A2
v2.00
是不是256M的SD的协议比较老呢?