Hi Nikhil,
On Friday 08 February 2008, Nikhil Gautam wrote:
After some debugging using BDI, I found out that there are more then one problem here.
IPL loads the SPL correctly. And I can see that nand_boot( ) is called. The first problem I found was that the nand_is_bad_block( ) is returning true after a while. I think its treating empty blocks as bad blocks. I know there are no bad blocks because I booted using the NOR image and then checked the NAND flash.
How did you define CFG_NAND_BAD_BLOCK_POS in your board config file? For 512 byte page devices this is "5" but for 2k devices it should be "0".
For testing you could change nand_is_bad_block() to return always 0.
Secondly, the SPL is copying the u-boot image to ram incorrectly. By this I mean, when I do the memory dump of RAM where U-boot image should be loaded, only the first NAND page (2K) is copied correctly. After that it's random or empty.
The third problem is that in the board config file #define CFG_NAND_U_BOOT_OFFS (16 << 10) is incorrect for current U-boot. If you look at nand_boot.c /* * offs has to be aligned to a block address! */ block = CFG_NAND_U_BOOT_OFFS / CFG_NAND_BLOCK_SIZE;
This is because this file copies sectors completely. For 2k page size and 64 pages per block, The SPL is again copying the complete NAND flash from address "0" to RAM.
Changing this define to #define CFG_NAND_U_BOOT_OFFS (128 << 10) will not help because when u-boot is compiles, it pads the image enough so that the U-Boot ram image is always located at 16K. Do you know how can I change it to that my new U-boot ram image starts from 128K offset.
Sure. This is defined in the nand_spl config.mk file. For example Sequoia has here in nand_spl/board/amcc/sequoia/config.mk:
# On 440EP(x) platforms the SPL is located at 0xfffff000...0xffffffff, # in the last 4kBytes of memory space in cache. # We will copy this SPL into internal SRAM in start.S. So we set # TEXT_BASE to starting address in internal SRAM here. # TEXT_BASE = 0xE0013000
# PAD_TO used to generate a 16kByte binary needed for the combined image # -> PAD_TO = TEXT_BASE + 0x4000 PAD_TO = 0xE0017000
You need to change this PAD_TO accordingly.
Hope this helps.
Best regards, Stefan
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