Hi Robert. > I set the bootargs variable to: root=\dev\ram (I used: set bootargs > root=/dev/ram) > But when I'm trying to start the Linux with the > > bootm 81000000 81FFFFC0 > > the Linux can't find the ramdisk. It write out: > > Initrd not found or empty - disabling initrd
Do you see U-Boot detecting and loading the ram disk image once you invoke your bootm command above? eg: ## Loading RAMDisk Image at 00500000 ... Image Name: uboot ext2 ramdisk rootfs Created: 2009-06-15 14:39:13 UTC Image Type: M68K Linux RAMDisk Image (gzip compressed) Data Size: 5219290 Bytes = 5 MB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Loading Ramdisk to 4fa79000, end 4ff733da ... OK I believe that for U-Boot to pass the ram disk image information to the kernel, it needs to be able to detect the ram disk image in the first place. You can use U-Boot's mkimage utility to add a header onto your ram disk image. > But when I set its address into the bootargs (so the bootargs: > root=/dev/ram rd_start=0x82000000 rd_size=0x191160), it works well; it > successfully find the image, and can mount it. This is because you're explicitly telling the kernel where to find the ram disk image in memory. Take a look at drivers/block/brd.c in the kernel src. > How does the U-Boot pass the ramdisk information? It sets some kind of > environment variables in the bootm.c. But it doesn't work for me. Why? > (I could use the bootargs solution in this case, but I'm afraid, it > can't pass other arguments too, like ethernet address, etc.) This is arch specific in U-Boot but I'd also check that your MIPS kernel has support for a) correctly parsing the U-Boot environment provided to it and b) providing the required data to other parts of the kernel for utilisation of the ram disk, eg initrd_start / initrd_end as an example. If you're struggling to pass other args to the kernel then it sounds like there is more of a fundamental issue somewhere, though. Maybe just double check Documentation/kernel-parameters.txt to make sure you're passing syntax in a form that the kernel will recognise? Hope that helps. Cheers, -- Matt _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
