I made my own board based on the Ulong 2440+ standard ce5 development board, and used your method to upgrade the SDRAM to 128M. The system can boot, but the SD card cannot be recognized after booting,
The power supply rejection ratio (PSRR) describes how well an operational amplifier rejects changes in the power supply voltage. PSRR is defined as the degree of offset per volt of power supply voltag
Can we arrange data transmission in a task, and when we need to send data to the host computer, we should turn off the interrupt first, and then turn on the interrupt after the transmission is complet