Hi All,
I am using Freescale's iMX51 based custom board with NAND flash size of 128MB. My root file system image size happens to be 75MB. I have DDR RAM of 128MB. My DDR Start Address is 0x9000_0000. I am trying to load my root file system to 0x9080_0000.(8MB after the starting location). But when i execute the tftp command, it loads some amount after that it hangs up. U-Boot> tftp 0x90800000 rootfs.jffs2
1. How much memory does the u-boot requires? Is 8MB enough?
2. Since I have 128MB of RAM, I should be able to load 120MB of image file. Why does it hangs up?
3. I tried to write the byte data to 0x97ff_ffff (the very last location of my RAM). It is working U-Boot > md.b 0x97ffffff 1 97ffffff: 04 . U-Boot > mm.b 0x97ffffff 97ffffff: 04 ? 32 U-Boot > md.b 0x97ffffff 1 97ffffff: 32 .
Now I tried to write the data to the next locations. I expected it to hang up. but it writes. Then i read the starting locations. But the data was written to there. Why these behavior? Is this behavior is correct? Is there anything wrong with my DDR Initialization? U-Boot > mm.b 0x97ffffff 97ffffff: 04 ? 32 98000000: 09 ? 32 98000001: 00 ? 21 98000002: 0c ? 12 98000003: 00 ? 12 98000004: 08 ? U-Boot > md.b 0x90000000 4 90000000: 32 21 12 12 2!..
A reply would be greatly appreciated.
Thanks in advance.
Thanks & Regards, Navaneethan P