Am Mon, 29 Okt 2001 schrieben Sie: > Hi , > I have a SA1110 based custom board with 16 MB ,32 bit SDRAM on it. > My processor is SA1110 133 Mhz AD ( stepping B5). > I had initialized the SDRAM controller according to the state machine given > in the SA1110 manual. My problem is that I am not to able run the SDRAM at > the full memory clock frequency ,and it is always running at only at half > the memory clock frequency. For eg when I ran the processor at 103.2 Mhz the > SDRAM ran at 25.8 but not at 51.6 Mhz. During SDRAM reads the SDRAM > is reading the wrong values. This I verified by a memory test program. The > test works well at 25.8 but not at 51.6 Mhz. Again when I configured the > processor to run at 147.5 Mhz it ran at 36.875 Mhz but not at half the speed. > I have used Non delayed latching as per the guidelines given in the SA1110 > manual. Has anyone ran the SA1110 processor (133 Mhz) at 66 Mhz? > Please help. > > Harishankkar
What bootloader do you use? We use blob on our custom sa1110/1111 board, and blob works quite well, gets actively developed & maintained, has a built-in memory tester and gets quickly adopted for other boards. Just join #blob at OpenProjects and we can talk, if you're interested. You can get blob via anonymous cvs form sourceforge, see http://sourceforge.net/projects/blob/ Joining forces mostly helps, at least it helped us with our board :) > > > _______________________________________________ > http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm > Please visit the above address for information on this list. _______________________________________________ http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm Please visit the above address for information on this list.
