In message 20031230160114.3874.qmail@web15003.mail.bjs.yahoo.com you wrote:
The monitor port can work on my custom board but u-boot hang or crashes after relocation.I read the DULG FAQ about the answer.I,however,want to make sure about the fact why the same SDRAM init code does work on RPXlite but in vain on my custom board for the SDRAM hardware design are the same with these two boards.
Is it _exactly_ the same design, with the same types of SDRAM chips?
I am sure that my UPMA RAM WORD is OK because of successful relocation.When I traced the code using
This does not mean a thing. First, the UPM initialization is just a part of the required initialization sequence; second, the relocation uses simple read / write cycles, while your problems happen when accessing the SDRAM in burst mode.
Is this realated with my hardware design or just software adjustment is enough?
Do we know your hardware design? No. Do we know your modifications to the software? No. Will you get a useful answer? Guess...
Best regards, and a Happy New Year!
Wolfgang Denk