Hi All,
I am using UBoot as a firmware and boot loader for a custom development board based on MPC7455.
I understand UBoot is not intended for use in interrupt modes, but I thought it does no harm in outputting some text on serial console everytime an interrupt comes in, say a timer interrupt (every 1 sec). I am using BDI2000 to start debugging at 0x900. But my problem is that since address translation is turned off while processing interrupts, I am not able to write to the serial port address since processor caches it and does not really push it out to the serial port. I am using ns16550 driver and the serial port is at 0x60000000.
Whats the work around for this problem ?
1. Shall I turn the address translation on, but I am not sure if its safe to do that, and even if I do that where exactly should I do that, in timer_interrupt routine or transfer_to_handler routine ? 2. Or shall i disable the data caches while processing interrupts ?
Thanks Sharad.