[U-Boot-Users] Re: ramdisk image question

[Alexander Povolotsky]

Yes, Wolfgang -

I am using U-Boot - but do I need somehow create ramdisk image first
(please note that I am building kernel in cygwin Windows XP environment)
?

Firstly I tried to use root file system using NFS server on the same Windows XP machine where I am building via cygwin - by copying pre-made root file system from Arabella CD-ROM to my windows disk drive - this did not work because hard links were not preserved during copying ...
bootargs=root /dev/nfs rw nfsroot=192.168.1.100:/home/apovolot/fadsroot
-I was getting during the kernel boot:
...
Looking up port of RPC 100003/2 on 192.168.1.100
Looking up port of RPC 100005/1 on 192.168.1.100
VFS: Mounted root (nfs filesystem).
Freeing unused kernel memory: 272k init
Warning: unable to open an initial console.
Kernel panic: No init found.  Try passing init= option to kernel.
 <0>Rebooting in 180 seconds..

Then I tried to use to NFS mount (read only) onto the Arabella CD-ROM itself (within my Windows XP): 

bootargs=root /dev/nfs ro nfsroot=192.168.1.100:/E/fadsroot

This caused kernel booting hanging:

...
Looking up port of RPC 100003/2 on 192.168.1.100
Looking up port of RPC 100005/1 on 192.168.1.100
VFS: Mounted root (nfs filesystem).
Freeing unused kernel memory: 272k init
*********** hanging **********

Finally I tried:

bootargs=root=/dev/ram rw devfs=nomount init=/bin/sh

bootm 200000               
## Booting image at
 16 08:49:38 EDT 2004                     
PQ2 ADS Portame:   Linux
68.1.103
PID hash table entries: 256 (order 8: 2048 bytes)
Warning: real time clock seems stuck!
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 30432k available (1348k kernel code, 324k data, 272k init, 0k highmem)
Calibrating delay loop... 131.07 BogoMIPS
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
NET: Registered protocol family 16
PCI: Probing PCI hardware
Generic RTC Driver v1.07
Serial: CPM driver $Revision: 0.01 $
ttyCPM0 at MMIO 0xf0011a00 (irq = 40) is a CPM UART
RAMDISK driver initialized: 16 RAM disks of 32768K size 1024 blocksize
loop: loaded (max 8 devices)
eth0: FCC ENET Version 0.3, 08:00:17:40:00:03
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
NET: Registered protocol family 1
NET: Registered protocol family 17
Sending DHCP requests ...... timed out!
Sending DHCP requests ...... timed out!
...

So what is the real solution ?

Thanks,
Alex
************************ 
In message <20040920.070149.1935.907342 at webmail13.lax.untd.com> you 
wrote:
> 
> Are there any  h/w architecture and board specific details to be 
> taken in account while coding/building the ramdisk ?
> If so, does the ramdisk explanation in the book covers those details > for PPC (Freescale's PQ2FADS-VR 82xx board with MPC8275)?

All the details you  may  collect here  and  there  are  completely
misleading  and  irrelevant as you wrote you were using U-Boot, which
has it's own way of handling ramdisk images, which is independent  of
the architecture or the kernel version.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Mistakes are often the stepping stones to utter failure.


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