Hi, I want to boot the ramdisk off the flash and having various problems in this regards (the kernel is booting off the flash just fine though].....
First way, When i tried to boot ramdisk off the flash by jffs2 partition, I am having a problem, The problem is when i try to read my rootimage from flash/jffs2 partition the uboot claims "Bad Data CRC" at verify checksum .... I copy over the rootimage to flash by means of simply mounting the jffs2 parition [ /dev/mtdblock3 in my case] and cp the image to it. Now this ramdisk image isn't corrupt, as i verify booting the same image by means of tftp and the uboot doesn't claim any "Bad Data CRC" this time. and ofcourse this image is in u-boot format (made using mkImage with -T ramdisk). and a ls in uboot prompt shows files on jffs2 partition just fine. So can anyone please give me some hint of what could be wrong ? Second way, i copied over the raw uboot format ramdisk to /dev/mtd2 by just dd if=/pRoot of=/dev/mtd2 and gave the start address of mtd2 FE100000 to bootm command , it loads ramdisk in memory but kernel was unable to find rootdisk start, here is the dump. the Uboot enviroment variables are bootargs=root=/dev/ram rw ramdisk_size=16384 mem=112M bootcmd=bootm FE040000 FE100000 Uboot> boot ## Booting image at fe040000 ... Image Name: Linux-2.4.4 Created: 2003-11-24 21:57:05 UTC Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 574327 Bytes = 560.9 kB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK ## Loading RAMDisk Image at fe100000 ... Image Name: Basit ramdisk Image Created: 2003-11-25 0:59:38 UTC Image Type: PowerPC Linux RAMDisk Image (gzip compressed) Data Size: 4660881 Bytes = 4.4 MB Load Address: fe100000 Entry Point: fe100000 Verifying Checksum ... OK Loading Ramdisk to 07abd000, end 07f2ee91 ... OK But after booting , kernel crashed. eth0: Phy @ 0x0, type LXT971 (0x001378e2) RAMDISK: Couldn't find valid RAM disk image starting at 0. Freeing initrd memory: 4551k freed kernel BUG at page_alloc.c:77! Oops: Exception in kernel mode, sig: 4 NIP: C002D6FC XER: 0000005F LR: C002D6FC SP: C01CFC50 REGS: c01cfba0 TRAP: 0700 MSR: 00089032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 TASK = c01ce000[1] 'swapper' Last syscall: 120 last math 00000000 last altivec 00000000 GPR00: C002D6FC C01CFC50 C01CE000 0000001F 00001032 00000001 0000001F C04F5160 GPR08: F0000110 00000000 C01B31E4 C01CFBA0 00000001 100199D0 07FE3000 007FFF3F GPR16: 00000000 00000400 00000100 00000000 00000000 C01CFE88 000001FA C01CFD48 GPR24: C0141250 00000000 C0160000 00000000 F0F0F0F1 C0160000 C7F2EE91 C0489A50 Call backtrace: C002D6FC C002E2AC C002E2EC C000CC1C C009CC00 C0155884 C0155994 C0153F14 C014F78C C014F830 C0003970 C0006454 Kernel panic: Attempted to kill init! Rebooting in 180 seconds.. Can any one help or provide some documentation pointers (i find a topic in DENX Linux/ELDK guide though but its not enough human for me ;-) , i need to find doc that describes how to setup initrd with Uboot say what we should pass to initrd=XXX kernel argument , the filename ? if the filename from where U-boot load it ? jffs2? how we specify ? ). Thanks. Basit ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
