sean wrote:

I've upgrade the capacity of Ram size from 256M to 512M on my custom board based on SEQUOIA.

(U-boot Version:2008.10-rc2)

I built a ramdisk image which is 72MB.( Also, I modified rd_size to 73728)

When I boot up my board, I've got a message like below.

RAMDISK: Compressed image found at block 0 crc error EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended

Why does "crc error" occur??

Your RAMdisk image is corrupt, almost undoubtedly in RAM, not the flash storage version.

If I use ramdisk image which is 4MB, "crc error" is not appeared.

And also if I use u-boot for 256MB on 512MB board, "crc error" is not appeared.

This is indicating your RAM and/or RAM memory map is messed up. I'm guessing that, if you use the memory write command to write to the 256K location (0x10000000), you will find that the same value has "magically" appeared at location 0... IOW, your RAM memory map has two copies of half of your memory (address aliasing).

If you do a RAM test, it should detect this problem.

Here are my U-boot source which I modified to upgrade memory.

Sorry, I'm not familiar with the Sequoia family, so I cannot tell you how to fix this.

Good luck and happy reading, gvb