Hi Gurumurthy,
I am using MIPS32 AU1350 processor board with 2MB of NOR Flash, I have programmed u-boot and Linux kernel in NOR Flash. U-boot is working able to boot linux kernel but not able to mount root filesystem from SDRAM.
I tried both initramdisk and initramfs. please let me know more info about this.
I have created uRamdisk and also passed boot arguments.
Below is the error log. let me know whether I am missing something.
Well you really need to debug the Linux kernel and especially the parameter passing from U-Boot to Linux on the MIPS architecture to find out why the kernel does not find the ramdisk (i.e. check do_bootm_linux() in arch/mips/lib/bootm.c).
On PowerPC we used to have registers r4 and r5 specifying the address and length of the ramdisk which was set on calling Linux. Maybe MIPS needs something similar. Becuase in recent U-Boot versions, the boot code was completely rewritten, you should trace all activity of the "bootm" U-Boot command before it calls the linux kernel in do_bootm_linux() and ensure that the expectations of the Linux kernel are met.
Cheers Detlev