Hello,
I have a PPC8250 based on which I am trying to boot u-boot. First I am using 8260 toolchain to compile this image, as 8250 is supposed to be equivalent of 8260.
I have configured SCC1 to be the console port.
When I step through the code using BDI, I see is the code is stuck in a while loop in serial_putc waiting for the Buffer descriptor ready bit to get cleared in putc function.
while ( tbdf->cbd_sc & BD_SC_READY ) ;
According to the hardware configuration the CPM should be running at 200 Mhz and core at 300 Mhz. I have CPM factor of 3, , Core Factor 4.5
Now when I reset the SCM by writing to the reset regiser, CPM is supposed to clear the bit when reset is done and I see that CPM is resetting itself correctly.
However I am bit stumped as to why the buffer descriptor may not be getting cleared. I have checked the external signal CTS, the Tx should be happening. I have tried all the baud rates. Only thing I have not tried is auto-baud.
So yesterday I changed order of init and tried to initialize the I2C first and right after the I2C init tried to perform a read something from a address I know where a I2C device is located, I don't see any activity lines on those pins there either.
It appears to me that CPM is "dead". Now how do I prove things either way, that it is not dead or its is working. Any CLUES I would really appreciate them.
In case someone does want to take at my config file I have attached it.
Anybody here that has done 8250 board, and booted u-boot on it, care to share your config.h file?
-Subodh Nijsure