Dear "mike xu",
In message 7103aeea0812170706p3e1fa7cby7093a87d4d01eb6f@mail.gmail.com you wrote:
I am using u-boot 1.2.0 and tried to boot kernel with one ramdisk, but it seems the u-boot doesn't load my ramdisk image at all. Please view
This is correct. U-Boot does not load the RAMdisk image - why should it? If the image is stored in NOR flash memory, the kernel can read it there as well, so copying it to RAM before starting Linux would be just a waste of boot time.
U-Boot just passes tha ramdisk address to the Linux kernel - assuming your ports of U-Boot and Linux for your MIPS board support this correctly.
Are there any special requirement of the ramdisk format for u-boot? I used mips mkimage command as below and both of the ramdisk.gz in ext2 or cramfs format are all failed. mkimage -O linux -A mips -T ramdisk -C gzip -n 'Test Ramdisk Image' -d ramdisk.gz uRamdisk
This is OK. Maybe you are using a kernel version that cannot use a ramdisk image from flash (i. e. it finds it only in RAM, like the vanilla ARM kernel does, too).
Patche sto fix that (for ARM) have been posted several timers before, search the archives if needed.
Best regards,
Wolfgang Denk