1. am3517从Sd卡启动,大约要3-4秒,为什么这么慢?有什么改进方法?
2. 为什么我设成重接从mmc1启动不行?为什么只有设成2d可以呢?
This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
1. am3517从Sd卡启动,大约要3-4秒,为什么这么慢?有什么改进方法?
2. 为什么我设成重接从mmc1启动不行?为什么只有设成2d可以呢?
1. Booting Configuration 是2d ( Peripheral Booting Configuration. Booting Sequence: USB UART MMC1 XIP)时,从上电到x-load出字符的时间为4S左右,电源芯片占了一秒,从cpu的速度来就说应该在1.5S比较正常。可能cpu在尝试从usb uart启动上占用了很长时间。
2. Booting Configuration 是2d ( Peripheral Booting Configuration. Booting Sequence: USB UART MMC1 XIP)时,启动没问题。 Booting Configuration 是0b00110 (Memory Booting Configuration. Booting Sequence: MMC1 USB) 时,就不行。
您好,我们会进一步实验和确认后,尽快给您答复